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Container Soils Water Movement and Retention

Does Al's gritty mix work pretty well?

Nikki, it's basically a semi-hydroponic method, where you are not really getting nutrients from the soil but from artificial addition with your water. It requires you to water & fertilize more often than soil mixes, often a couple times a week or more. It also works best outdoors, since you need to let the mix run more freely from the bottom of the pot, which is very difficult to do for a serious houseplant collection indoors. That sounds like a hassle, but if you can meet those conditions it provides great gas exchange to help limit rotting roots or overwatering. Hydroponic style nutrient additions which would normally be used with this mix cause more work but will also have the potential to give you excellent growth if done right.

I am a little concerned by two of the ingredients. Bark fines have been shown to be a limiting factor by tying up available nitrogen in the mix. Hydroponic-style nutrients at almost every watering should be able to overcome that. Turface has been used by some for years, but it is not yet a proven ingredient for houseplant potting mixes. Many of the bonsai growers are moving away from it. I personally think it also reduces growth potential. See here for a discussion.

Overall though, as a long-time custom soil builder, I give this mix two thumbs up if you are mostly an outdoor grower and diligent waterer. :)