I have been wanting to make my own potting soil for months now, but I have been slow to get off the mark. I have found may recipes online, but I needed to get to my local nursery to get some supplies. Today I picked up what you see below. On the left is coconut coir. This material is a more sustainable replacement for the more limited peat moss. I have found that many recipes have switched over to this.
My goal is to use my own homemade compost as the main organic material and combine that with the coconut coir and some perlite. I tried using my compost alone as a potting medium, but it is very hydrophobic, which means it sheds water and resists wetting. I think by combining the materials I will end up with something that works better as a potting soil.
I am not sure yet what my ratios are going to be for my mix, but I am looking at 3 parts compost to 1 part coir and 1 part perlite. I will play around with this mix until I feel I have something that works, though, so this ratio could change greatly once I start mixing. Once i get something I like I will also show you some re-potting I need to do and maybe even use it to start some seeds.
If you have any advice on making your own potting sol using these ingredients or others, leave a comment on this post. I would love to hear about your experience. What it comes to projects like this, I am far from an expert and will take any advice you have to offer. This is all a part of A Gardener’s Notebook — trying and learning together.