How to Make Natural Lemongrass Soap

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Recipe and instructions for how to make natural cold-process soap with lemongrass essential oil. Includes a full DIY video explaining each step.

How to Make Natural Soap with Lemongrass Essential Oil

Natural lemongrass soap tends to be bar soap scented with essential oil, and this recipe is no different. Lemongrass essential oil is a beautiful liquid made from steam-distilling real lemongrass. It’s also one of the few citrus essential oils that has lasting powder in soap recipes. While other citrus oils will fade over a matter of days, the sweet scent of lemongrass lives on!

This simple lemongrass soap recipe requires only four oils, nature-identical color in the form of oxides, essential oil for scent, and a few other ingredients and materials. The instructions follow the cold process soap-making method, and the recipe will give you about ten bars of soap. Feel free to use a loaf mold, as shown in the photos and video, or cavity molds for perfectly shaped bars of soap. Once the ingredients are measured, it only takes about half an hour (or less!) to make, but the soap bars

Lemongrass Soap Recipe

800g batch — 1.76lbs (refers to oil weight)
Makes approx. 8 bars & fits in this silicone loaf mold
Technical info: 6% superfat and using water as 25% of the oil content
A full DIY video showing how to make this recipe is below.

How to Make Natural Soap with Lemongrass Essential Oil

Lye Solution
109g/ 3.8oz Sodium hydroxide (also called Lye or Caustic Soda)
196g / 7 oz Distilled water
Solid Oils
200g / 7oz Coconut oil
150g / 5oz Shea butter
Liquid Oils
400g / 14oz Olive oil (or olive oil pomace)
50g / 1.76oz Castor oil
1/16 tsp Yellow iron oxide (optional)
1/16 tsp Chromium green oxide (optional)
Add at Trace
8 drops Grapefruit seed extract (optional)
4 tsp Lemongrass essential oil

Special Equipment needed
Digital thermometer
Digital kitchen scale
Stick (immersion) blender

Natural Soapmaking for Beginners Series

If you’d like to learn more about making natural soap, read through my four-part free soap making series. Each part includes a thorough background on soap making ingredients, equipment, safety precautions, basic recipes, and the full process of making soap. Continue below for specific instructions for the lemongrass soap recipe.

  1. Natural Soap Making Ingredients
  2. Soap Making Equipment & Safety
  3. Easy Soap Recipes
  4. The Full Cold Process Soap Making Process
How to Make Natural Soap with Lemongrass Essential Oil
The soap at ‘Trace’

Step 1: Measure the Ingredients

It helps to be prepared so have all of your ingredients measured and your equipment and work space set up. Get your goggles on, latex/rubber gloves on, tie your hair back, and make sure that you’ll be able to work undistracted. Also, measure all of the solid oils into the pan and the liquid oils into a jug.

Step 2: Mix the Colored Oil

Without the colorants, this soap will be an off-white color. It’s the mineral powders yellow iron oxide and chromium green oxide are what gives this soap its light green color. They are completely optional though, so if you don’t want to use them, you don’t have to. You can also make lemongrass soap with a different soap colorant, if you’d like.

To use the mineral powders called for in this recipe, pour a Tablespoon of the olive oil called for in this recipe into a glass. Add in the mineral powder and blend it until it’s thoroughly mixed. A tiny whisk or milk frother both work great for this. Set aside after mixing.

How to Make Natural Soap with Lemongrass Essential Oil

Step 3: Mix the Lye Solution

Making the lye solution is the step that you need to take the most precaution. Wear goggles, gloves, and work in a well-ventilated space. When you’re ready, pour the sodium hydroxide (lye) crystals into the distilled water. Mix together with a stainless steel spoon until the crystals are dissolved. There will be heat and steam so be prepared and don’t breathe it in. The jug will get hot on the bottom and keep your face well away from the steam. When mixed, set the jug of hot lye solution in a shallow basin of water to cool.

How to Make Natural Soap with Lemongrass Essential Oil

Step 4: Heat the Solid Oils

On very low heat, melt the solid oils until there are just a few solid bits left floating. Take the pan off the heat and stir until the oils are melted.

Step 5: Add the Liquid Oils

Pour the liquid oil measured in the jug into the pan of melted oils. It helps to stir it first to help the sticky castor oil to disperse in the olive oil. Next, pour the colored oil through a sieve and into the pan too. The sieve stops undissolved chunks of color from getting into the soap. Scrape every last drop of oil from both containers with your rubber spatula.

How to Make Natural Soap with Lemongrass Essential Oil

Step 6: Take the Temperature

Take the temperature of both the oils in the pan and the lye solution. The oils should be within 100-120°F, and the lye solution should be within ten degrees of the oil’s temperature. When they’re just right, pour the lye solution into the pan through the sieve. The sieve helps to catch bits of undissolved lye, if any.

Step 7: Bring to Trace

Gently insert the stick blender into the oils and lye solution. Alternate a few short pulses and gently stirring until you hit a light ‘trace’. This is when the soap batter thickens just enough that if you lift the stick blender out, the dribbles will hang around on the surface. The video further above shows my method for pulsing and stirring and also what trace looks like. Try to keep the blender’s head on the bottom of the pan to minimize air and splattering.

Step 8: Fragrance

When the lemongrass soap has thickened to trace, measure in the grapefruit seed extract (optional ingredient) and essential oil. Stir well and then pour the soap into the mold(s).

Step 9: Insulate

Slide the molded soap into a cardboard box and close it up. Cover the outside with a towel to keep the heat in. Drafts will cause the soap to cool quicker causing the end color to not be as vibrant.

Step 10: Cutting & Curing

After twenty-four hours you can pop the soap out of the mold and cut it up using a kitchen knife or thin metal wire. Afterward, space your bars out on a piece of wax paper in an airy place that’s out of direct sunlight. Leave the soap there to ‘cure’ for four weeks before using.

Curing allows the water content in the soap to evaporate out. For full instructions on how to cure handmade soap head over here. When that month is up, your handmade lemongrass soap is ready to be used.

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90 Comments

  1. Elizabeth says:

    Hi Tanya,
    Thank you for another wonderful recipe. Is it possible to add the 2x and 3x ingredient list as you do for most of your soap recipes?

    Thank you!

  2. Thank you for the quick response. Will follow up with the results next week.

  3. Hello!

    Getting ready to make this lovely recipe. Can you tell me what size/capacity is the pot you are using to melt, mix and bring to trace?

    Thank you!

  4. Is this Safe for all skin type? FDA approved?

  5. Love this tutorial! If I wanted to add goat’s milk to this recipe, how would I calculate the amount to add? Does something need to be left out in order to add the goat’s milk?

    1. Goats milk, as a liquid, replaces some or all of the water amount in soap recipes, and you can find out a little bit more about that in my goat milk soap recipe. You can also add goat milk powder to soap recipes at trace.

  6. Hi, thank you so much for your amazing recipes. do this recipe useful for all types of skin or not? How to make it suitable for different skin types? which part of the recipe must be changed?

    1. Hi Mohammad, this is a good recipe for all types of skin. If you wanted to make soap specifically for sensitive skin or oily skin then you’d need to create a new recipe. That’s advanced soapmaking but you can read about the process of changing a soap recipe for a better idea.

      1. that`s amazing, thank you so much

  7. Wendy Johnson says:

    I am enjoying the great information and am excited to try this recipe. I am wondering if using dried, small pieces of lemon grass would work?
    Wendy

    1. I’d say yes but only a very small amount and well pulsed up so that only tiny pieces remain. You don’t want it to scratch your skin or clog the drain :)

  8. I can’t wait to try this out! I had a quick question for you. I bought a bar of soap from a local maker that has aloe and Vitamin E oil in it. Can these be added to base soap recipes, and if so, what considerations do I need to make? I know the Vit E is an oil, but what about the aloe? Is that treated as an additive or does it need to be calculated into one of the base groups? Thanks for any tips, I’m thrilled I found your site!

    Cheers!
    Carrie

    1. Thanks, Carrie! Vitamin E oil is usually added in soapmaking to be an antioxidant for the soap rather than an antioxidant for your skin. You can leave that ingredient out if you wish. Aloe is a soap additive and you can treat it as a puree in soap. Use around 1 oz (28 g) per pound (454 g) of soapmaking oils, but since the aloe juice is mainly water you should subtract the amount of distilled water called for in the recipe by the aloe’s amount.

  9. Pat N Craven says:

    Can we use liquid chlorophyll for color? If so how much and at what point do you add?

    Thanks,
    Pat

    1. Liquid chlorophyll is a great option for relatively long-lasting greens. You add it directly to soap at trace and shades can range from a light green to deep forest green, depending on how much you use.

    2. Love the colour of the soap the lite creen

  10. Angie Mace says:

    Hi,
    Thank you for your willingness to teach the soap making process. I have never to make soap, but it has always been a skill that I wanted to obtain.

    I’ve been collecting the items needed to make the Lemongrass Soap Recipe. You’ve noted in your instructional videos the necessity of following your recipes completely without making substitutions of ingredients. My question is this: are the two oxide items essential for this recipe? Can the recipe succeed without these two items: Yellow Iron Oxide and Chromium Green Oxide? My search for these two items has resulted in a possible back order situation. So, I thought I’d ask about the possibility of succeeding without these two items.
    Thank you,
    Angie Mace
    North Carolina

    1. Hi Angie, the oxides and essential oil are optional in this recipe. The main soaping oils, water, and sodium hydroxide are essential to create the soap though.

  11. hi, I love your blog! I’m a big fan! a 10-year dream of making soap has come true!
    thank you so much!
    I wanted to know if you have any soap recipe to use for laundry detergent?
    will I put super fat in that too? or will it make my laundry oilee?
    and have you tried making soap with canola oil? that is a cheaper oil around me.
    thank you!

    1. No superfat in that one, otherwise it will make your clothes oily :) I have a laundry soap recipe planned so keep an eye out for it next month.

  12. Hi Tanya, I’m loving the soap recipes, I’ve done three so far and the first two turned out brilliantly. My third was this lemongrass recipe and it’s fine except that just as I was pouring it some yellow lumps started to form. I’ve cut the soap now and the lumps are visible. There are some small yellow spots and some larger lumps (about the diameter of a 5p but squished). Have you any idea what I might have done wrong? I followed the recipe exactly except I left out the Grapefruit seed extract and colour, and I added half a teaspoon of poppy seeds. It took me a little while to get the temperatures right. My oils had to be warmed up, and by the time I’d got them right the lye was too cold and I had to warm it, but they were right when I poured them. The soap looks fine and usable apart from the lumps, I’m just wondering how to avoid this in future. Any advice? Thank you! Kelly

    1. I suspect that you had a good medium-to-thick trace and you poured the essential oil on top and left it there for slightly too long. Meaning seconds rather than minutes! It’s happened to me before on several occasions and mixing the essential oil in quickly at a lighter trace seems to sort it out.

      1. Thank you Tanya! This makes total sense, I think I did overdo it with the hand-blitzer, I didn’t realise it had traced already, and I probably was too slow stirring in the essential oil. Very good to know this so I can avoid it in future. Thanks so much, this has been such a helpful website for me, and I love your gardening videos too! Kelly.

  13. Nadege Dufour says:

    Bonjour
    Je voudrais savoir à quelle température mélanger les huiles et ls soude pour réussir à avoir une pâte plus fluide merci

    1. Popping your question into Google Translate, I get this: “I would like to know at what temperature to mix the oils and soda to succeed in having a more fluid paste thank you.”

      Your question is about temperature and I’m assuming you mean the soaping oils and the lye solution. For small and simple batches like this, stick to soaping at temperatures from 100-120°F (38-49°C). Higher temperatures make the soap trace a lot more quickly and can lead to the soap having a dark spot in the middle if the soap doesn’t fully gel. I’d stick to as low as you can go (100°F/18°C) if possible.

  14. Hi. I have made a batch of this soap this afternoon. It came to trace pretty quickly (much faster than the other two recipes I’ve tried so far!) I didn’t colour mine as my mica powders suggest I add some polysorbate 80 to stop them dying the bathtub and skin! I’ve ordered that now for next time. This soap smells lovely (I used my lemongrass and lime fragrance oil). It’s exciting to be trying out new recipes and each time incorporating different ingredients. This is only the third batch of soap I have ever made and the second recipe of yours I have tried so far. I can’t wait for them to cure and my family can’t wait to try them either! Thanks again for the inspiration?

    1. Hi Suzy and I’m really pleased you’re enjoying your soap making adventure :) Keep in mind that different fragrance oils can accelerate a soap recipe and can make it trace very quickly. I suspect that’s what happened with your lemongrass and lime FO. There’s often some information on acceleration from soap making suppliers that sell FO so keep an eye out for that. Also, the mineral powder in this recipe will not dye/tint the tub so no need to add anything extra. All the best, Tanya

  15. Hi! I love these videos. I am new to all of this. Can you please explain how you measure your liquids? I have the kitchen scale, and notice that the liquid ingredients have gram conversions listed which is helpfull. However, how do you measure the liquids? I’m assuming measure and empty cup, place liquid oils into the cup, measure, and subtract the difference?

    Thank you!

    1. Hi Athena, in soapmaking you measure all of your oils using a digital scale. You can measure each oil/butter into a separate container or into the same one. Digital scales have a tare function. That means that after you measure an oil into the container, you hit the tare button to reset it to zero so you can measure the next one in.

  16. Can I use Avocado oil instead of olive oil?

  17. Moksha Essentials says:

    Great information….thanks for sharing with us
    Keep it up

  18. Thanks for sharing the tip

  19. Jennifer Hernandez says:

    Can I use mica powder instead of the iron oxides?

    1. Yes, you may. Micas are similar to oxides in coloring but are less natural. They’re often made with dyes, sometimes with mineral pigments, that are coated onto mica particles.

  20. Leanne Donaldson says:

    Can I substitute Spiralina powder and Tumeric for the color?

    1. Yes, but I imagine that you’d get a murky brown if you mix those two colors together.

  21. Hi lovely Tanya
    Thank u for all useful tutorials, I wanna know that is there any speacial relation between amount of solid oils and liquids? How can I change amount of each solid oil n ven how exchange them with other kind of solid oils ? Is there any formula ?

    You are great <3

  22. In your opinion, does hand milling soap really make it last longer? I really like your recipes, thanks for sharing them with all of us!

    1. Hi Lorraine, I don’t think it makes soap last all that longer. What hand milling (or rebatching) soap is great for, is adding sensitive ingredients that might be damaged in hot/cold process soap making. Herbal infused oils, delicate essential oils, and some natural colorants. It’s also a good way of fixing a batch of soap that didn’t turn out the first time in some way.

  23. I love this recipe! The soap is so smooth and creamy I almost want to take a bite out of it. Haha! The scent is amazing too. Will definitely be making this a staple!

  24. Kai Malloy says:

    Hi Tanya,

    Thanks for the lemongrass soap recipe! As a beginning soap maker I’ve learned so much from your blog and I really appreciate all that you do. I am looking to alter your recipe a bit on my next batch to make a Lemon Thyme soap by replacing some of the lemongrass essential oil with lemon and thyme oils, and also adding thyme to the recipe. My question is twofold: First, what ratio of lemongrass, lemon, and thyme essential oils should I use. Second, what is the best way to add thyme to this recipe for best flavor? Water infusion? Oil Infusion? Fresh or dried and chopped? I have fresh thyme in my garden and can do any of these things with it, I just not sure which one might add the best smell and be best and relatively quick to do?

    Thanks!

    1. Hi Kai, infused oils don’t have a strong scent, especially used in soap. To scent soap naturally you need to use essential oils. Also, most citrus essential oils don’t last long in soap either so avoid using lemon, orange, or tangerine. Lemongrass and Litsea cubeba are two of the exceptions. For more information on essential oil usage in soap head over here: https://lovelygreens.com/make-soap-with-essential-oils/

  25. Why is lye used and is it used in all homemade soap?
    Thank you ?

    1. Yes, all true soap is made with lye. It could be Sodium hydroxide for bar soap or Potassium hydroxide for liquid.

  26. Do you know how many grams are in a 1/16 for the mineral powders?

    1. I don’t tend to measure it in grams. It will be a tiny fraction of a gram and you’ll need a micro-scale for that.

  27. Cristina Lavín says:

    Hi Tanya! im writing from Mexico, Ican´t find the Grapefruit seed extract anywhere. Is there anything else I can use instead?
    Have a good day!

    1. Just make sure that all of your soaping oils are well within their best-by dates then you can leave it out. Grapeseed extract helps soap to not go rancid but it’s more of an issue if you’re using old oils.

  28. Hi Tanya!
    After reading your entire blog these past two weeks (ha) & watching your youtube videos (which are very, very helpful), I gathered all the necessary ingredients and tried out my first batch of soap this week!
    I followed this Lemongrass recipe exactly, took my time and used pre-measured ingredients and it went AMAZINGLY. I had low expectations for myself since I often can’t even bake a cake properly ha, but I just followed all your advice and yipee! Zero issues with mixing lye (since I had mask, gloves, goggles, well-ventilated space), I hit trace pretty quickly and then put the soap mixture in the mold, and 24 hours later..out popped my soap loaf (which was nice and smooth for cutting). I am so excited, it smells so great. I am usually not a patient or pre-measuring kind of person, but with this attempt.. I just took my time (that was key!). It actually didn’t even take very long once I had my ingredients near me. I also made sure to clean everything up while still wearing my gloves. Literally, not one single issue. One *tiny* change I did do, was that I left out the colors. I wanted my first try to have as few steps as possible. Now that everything is all cleaned up and the soap is curing, I am going to try out another one of your recipes today! Thank you for a new soaping addiction :)

  29. Going to be giving this recipe a try this week but my partner is really keen to try vanilla. Could the lemongrass essential oil be swapped for vanilla scent?

    1. Yes but fragrance oil can behave differently than essential oil in soap. It can make it ‘Trace’ — harden up — quicker and vanilla fragrance can also tint the soap a light brown colour. The quantity will be about the same though. Make sure that your fragrance is safe for skin use and look for the manufacturer’s recommendations on what to expect as far as acceleration and usage.

  30. What about using green clay in place of the mineral powders? Are the mineral powders all natural? Are they simply for the color property? Thank you!

    1. Green clay is fine. Make sure to mix it with a little water before adding it to the soap though. It can cause lumps of colour otherwise.

  31. Hi there,
    This is great! Thank you.
    Just a few questions please:
    1. Would it be ok to use a stainless steel bowl for the water (to add the lye to)
    2. What is the size of the stainless steel pan you use in the video (In litres please if pos)
    3. How long does it take to reach ‘trace’ with the mini blender?
    4. I know there is a window but what is the ideal temperature of the lye & oils to mix them together
    5. What is the best way to wash/clean the utensils that have been in contact with the mixture

    Many, Many thanks

    Kristina

    1. Heat proof plastic is best for the lye solution — it helps to see the level of the lye water as well as keep the contents from melting/reacting. As far as your other questions, no idea for the trace time so you’ll have to try on your own ‘mini blender’. Stick to the temperatures in the recipe and no idea on the size of the pan. Does it really matter since you already know your ingredients quantity and the volume of your own pans? The best way to clean the utensils afterwards is to keep gloves on and wipe everything down with paper towels. Dispose of the paper towels and wash your pans and utensils by hand.

      1. Just wanted to add a little bit of information that I have learned along the way working with homemade soaps. You asked about what the ideal temperature of the lye and oils to mix them together. From my experience and literature references, about 10 to 15 degrees within each other; appears to work the best. Trace timeframe question. That can depend on usage of essential oils as this can speed up trace and other reasons can simply be just the base oil you are using. Oils that have a high saturated fatty acid profile can speed trace quicker then those that are not as saturated. Since most recipes call for multiple types of oils, there really isn’t a tell sign of how quick one recipe will trace faster than another recipe. The speed of your mini blender can also affect trace time. If you are not in a hurry to use your utensils and bowls, you could let them set for a week to harden up and then wash since it will set up as soap. It is not recommended to use your utensils and/or bowls as part of food preparation once you’ve used them for soap making. Hope this information helps. Happy Soaping!

  32. Hi, I am new to soap making. I have already followed your recipe and made my 1st batch of lemongrass soap, it looked great. But I just wanna to double check with the amount of water use in your recipe. I just use a soap calculator to read your recipe and it calculated the water to be use should be 304g!

    1. The amount of water you use in soap recipes is flexible. Remember that it evaporates out of your bars completely by the end! You need at least as much water (in weight) as you have caustic soda in a recipe. I prefer using around double that amount though. The more water you use, the slower your soap will be to harden which can be good for swirling techniques and pouring large batches. The less water you use, the quicker it will firm up — you’ll also have reduced chances of soda ash.

  33. Thank you for this recipe! I recently made it and it turned out great! Could I add activated charcoal to this soap?

  34. Can I substitute the lemongrass for another scent? And can I add dried herbs to it?

  35. Hi I tried the soap and it didn’t come out well,crumbled ,wen cutting,may I pls no the cause

    1. Make the recipe again and double check all of your measurements and ingredients. Use the exact recipe with no additions or subtractions and always measure by weight with a kitchen scale. Another person had issues as you’ll see in the comments and it turned out they were using the wrong ingredient.

      Crumbly soap can sometimes be caused by using too much lye. Double check that. Lastly, it could be your soaping temperature. If the oils and lye-water are below 100F then the chances of it turning out crumbly are much higher.

      Good luck and I hope you figure out what the issue was.

  36. I tried your recipe with my 12 year old daughter to spend some quality father/daughter time. Very methodical and the outcome was with no flaws at all. Great explanation ! However, as this was our first time with this project I noticed that the shea butter leaves a stronger scent after the cold process than the lemongrass itself. Is this normal ? We have three more weeks of curing. Will this prevalent she butter scent lessen over time ? Or, it is the brand of shea butter I am using ?

    1. Hi Normand and thanks for sharing your experience! Pleased the steps were clear and you made the recipe successfully. As for the shea butter scent — I suspect that you’ve used unrefined shea butter. The more common shea is refined and doesn’t have that much of a scent. If you’d prefer more of the lemongrass scent in the future, try to find refined shea.

      1. Thank you ! Will try that next. That is a good pointer.

  37. Heather N Trimble says:

    Hi I was wondering if I could use turmeric for colour instead of the oxides?

    1. Yes you could but Tumeric can add a gritty texture to your soap. Use it sparingly.

  38. Wei Chi Wong says:

    Can I use liquid coconut oil?

    1. Do you mean frationated coconut oil? If so, yes you can but the lye amount will need to be updated. Fractionated coconut oil has a different saponification value from the solid oil.

  39. Claudia. Mazurkiewicz says:

    What does the lye add to the soap? Can you make this receip without the lye?

  40. Heather R says:

    What is the superfat of this recipe? And does it lather well? Thanks!

    1. It’s at the start of the recipe — 6%. Check out the video embedded st the top of the post to see the lather :)

  41. do you have a substitute for grapefruit seed extract?

    1. A lot of soap makers are beginning to omit using an antioxidant at all these days. You could do the same if you wish.

  42. Hello there!

    I attempted this soap and came up with some pretty weird results. I measured everything precisely, and followed the temperature suggestions, but I ended up with a jelly-like substance that absolutely won’t harden up. It’s like a mix between mashed potatoes and olive oil, a big gloppy jelly. Any idea what I may have done wrong? Or if I can do anything to fix it? Thank you for your time! Any suggestions would be much appreciated.

    1. Mystery solved! Just realized I’ve been using potassium hydroxide instead of sodium hydroxide. Doh! What a waste. But a good learning experience :)

      1. Yes, Potassium hydroxide is also a soaping ingredient — but for making liquid soap and in a completely different process. Good luck with your second attempt!

  43. Hello I am new to the soap making process actually never made it before. Yesterday l made the Lemon grass soap and it looks like it turned out, and the smell coming from the curing box is very nice. I do have one comment could you look at the recipe the water measurements do not add up, it calls for 10.7 oz or 196 g of water well 10.7 oz is actually 303 grams. Which number do you follow i used the 196 grams of water and it looks like it turned out

    1. Oh dear! Yes that was a typo — I always use grams and the oz amount was incorrect. THANK YOU. If anyone made the recipe with the larger amount it’s not a big deal — it will just need the full four weeks to cure (to allow the water to evaporate out)

  44. I don’t have the mineral powders but I really want to make this soap. Can they simply be omitted?

    1. Most definitely. The soap will be a more creamy colour but everything else would be the same.