My DIY Aroid Soil Mix Recipe

 

have experimented quite a bit and come up with this "recipe" that I think is the best aroid soil mix. I use this for all my aroids, which include aglaonema, anthurium, monstera, philodendron, pothos, syngonium, and ZZ plants. I also use it for my Hoyas and most of my other houseplants, except orchids, African violets, and begonias.

I generally have a fine mix on hand for smaller pots and a chunkier mix for pots 4 inches or larger. Feel free to adjust things to meet your needs.

Why Make Aroid Soil Mix?

Normal potting soil that most big box stores and large nurseries use is mostly made from peat moss and a little perlite. This is great at retaining water but doesn't let very much air get to the roots of the plant, which can suffocate them.

Especially over time, as the roots grow and the soil becomes more compact from watering, the soil gets even denser, and you can start having all sorts of problems with your plants, like brown or yellowing leaves or root rot. It is very easy to overwater plants in a mix like this and suffocate the roots.

What is Aroid Soil Mix?

My special blend is a mix of orchid bark, coco coir, pumice, charcoal, and worm castings. The goal of this mix is to provide moisture, nutrients, and air to your plant's roots. It is important to try to get about the same size of each of these ingredients, so there are small air pockets, but also so more dense items don't work their way down to the bottom of the pot and suffocate the roots.

A good mix will allow the roots to grow and get plenty of air and water and will help prevent overwatering of your plant.

Fine Aroid Soil Mix (For pots under 4 inches)

Chunky Aroid Soil Mix (For pots over 4 inches)

How do you make aroid soil mix?

Can You Use Aroid Soil Mix for Hoyas?

Yes. I have used this chunky soil mix for Hoyas as well as aroids and many of my other houseplants. Hoyas are epiphytic or lithophytic plants in nature, depending on the species, so I prefer growing them in a medium that allows plenty of air around their roots rather than dense potting soil.

The size of the ingredients is especially important when you're growing small plants. For two- and three-inch pots, I use the finer version of the mix so there aren't oversized pieces taking up most of the small pot.

If you're new to Hoyas, you can read my Hoya plant care guide for more information about how I grow them.

Looking for a New Plant to Grow?

Hoyas are some of my favorite houseplants, and I grow hundreds of different varieties. If you enjoy aroids but haven't tried growing Hoyas yet, many varieties are easy to grow and make beautiful additions to a houseplant collection.

New to Hoyas? Browse my Hoya Plants for Beginners collection to find some of my favorite easy-to-grow varieties. Every Hoya I sell is rooted with new growth, and the product photos show the actual plant you will receive.

An Alternative to the Pumice and Charcoal

Pumice and charcoal can be very hard to find locally and can be expensive, so as an alternative I've started substituting the 5 parts pumice and 2 parts charcoal with 7 parts of Lechuza Pon. It is very consistent in size and quality and is made of pumice, lava rock, and zeolite, and the zeolite is a great replacement for charcoal.

What is the Best Orchid Bark for Aroid Soil Mix?

I have tested many brands of orchid bark so you don't have to. The trick is to find some that is only fir/orchid bark, has the same size pieces in the bag, and is the right size for the pots you have.

Fertilome Orchid Mix

This is a mix of sphagnum peat chunks, red fir bark, hardwood charcoal, and volcanic lava rock. First of all, I don't like mixes because I don't know how much of each ingredient is in the mix. A lot of this mix is peat moss chunks, which I don't like, although they could be used instead of coco coir in a bind. The fir bark was fine, but there wasn't that much of it, and it had a huge range of sizes. The charcoal also had a large range of sizes. I don't generally use lava rock in my mix, but it's very similar to pumice and could be substituted in your chunky mix.

What I ended up doing is separating everything out and making individual piles for different uses. It was a bit tedious, but I had a large pile of peat chunks, which I broke up and threw on some low spots on my lawn. I separated the bark into fine and chunky piles, I separated the charcoal into fine and chunky piles, and put the lava rock into my chunky mix in place of some of the pumice.

Conclusion - I do not recommend it unless you have an extra hour or two to kill or unless you don't care that much about your mix because it could actually be a decent mix on its own for medium-size pots.

Gubler Orchid Grow Mix

I found this at a big box store for $6.48 for 4 quarts, so it's actually quite expensive. Its only ingredients are fir bark and chunky perlite. I picked out the chunky perlite and used it in my chunky aroid mix, and used the bark in my chunky mix. I did not feel like separating out the bark into the various pieces.

Conclusion - It's alright, but expensive, and the bark has inconsistent sizes and is large enough it should only be used in 5-inch pots and up.

E. B. Stone Organics Orchid Bark

I liked that this was only bark, but it had very inconsistent-sized pieces and most of them were huge - like they would only work for an 8-inch pot or larger. I ended up separating out the sizes, and I am slowly using up the huge chunks in my chunky mix by using one part of it and 4 parts of my favorite bark. I bought it for $8.47 for 8 quarts at my local garden center.

Conclusion - Most of the chunks are way too large.

Uni-Gro Fine Grade Orchid Bark

This is my favorite mix for two- and three-inch pots (which is mostly what I have because that's what I start my cuttings in to sell). I buy it at Sun River Gardens in Orem, Utah for $7.99 for 8 quarts. Look for it in independent nurseries. Make sure to buy bags with a big "FINE" sticker on the front because the regular mix is huge.

Conclusion - It is very good quality and has similar-sized pieces of fine fir bark. The biggest drawback is that it is hard to find.

Zoo Med Premium Repti Bark

In a moment of pure desperation after I cleaned out all the stores around me of orchid bark after bleaching all my plants I tried the pet store and was very glad that I did! This is slightly larger than the Uni-Gro brand, but it is consistent in size and very clean. Try to buy it on sale because the regular price is $14.99 for 10 quarts, but the national pet stores often have it on sale for a good deal. I got mine on a buy one, get one half off deal. It is even available online if you can't find it locally.

Conclusion - It is good quality, has similar-sized pieces of fine fir bark, and is easy to find. I use it in my fine aroid mix.

Thrive Fir Bark Bedding

This is also available at national pet stores and is normally $29.99 for 24 quarts, but it also goes on sale fairly regularly. It is clean and has consistently sized pieces and is my favorite to use for 4-inch pots and up.

Conclusion - It is good quality, has similar-sized pieces of fir bark, and is easy to find. I use it in my chunky aroid mix.

What is the Best coco coir for Aroid Soil Mix?

Urban Worm Coco Coir

I like to use this for my two-inch and three-inch pots. I buy mine on Amazon because it is good quality and a good price.

MegaMulch Expanding Coconut Coir

It buy it from Costco in the spring and summer and stock up for the rest of the year, which isn't hard to do because it comes in two huge blocks that last for a long time. I use it in my chunky aroid mix.

Pumice

I buy mine locally for $6.99 for 8 quarts. I can't find a good online source for it. An alternative is perlite, which is affordable and easy to find but I don't personally like it. Another substitute would be lava rock but I haven't used it much myself so I can't make any recommendations.

Charcoal

Fertilome Charcoal

This is relatively easy to find and will work for the chunky mix. Some of the pieces are really large. It does not have consistently sized pieces but as far as affordability goes, it's a good choice.

Sprig Stone Charcoal

I prefer this for my fine mix because it has consistently small pieces. I get it on Amazon.

What I Use for My Hoyas Now

Although I have successfully grown Hoyas in this aroid mix, I now grow my Hoyas in a DIY Pon mix. I like the consistent particle size and the amount of air it provides around the roots, especially since I grow so many of my plants in small pots.

Ready to Add a New Hoya to Your Collection?

Whether you grow your Hoyas in a chunky soil mix or Pon, choosing a growing medium that works well with your watering habits is one of the most important parts of keeping them happy.

I specialize in growing and selling Hoyas, including rare, small-leaf, variegated, silver, and beginner-friendly varieties. My plants are sold rooted with new growth, and you can see the actual plant you're purchasing in the product photos.

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