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FAQ Categories:Home Composting
Using compost provides a balanced supply of slow-release nutrients when used as a component of a potting mix. It should not be sterilized as it is that defeats the part of the purpose in using compost in the first place–it is the microbes that put the “health” into “healthy soil”. Depending on the size of the pot, you should replace the soil every one to two years.
A good basic recipe for houseplants is to mix equal parts screened compost, peat moss, vermiculite and perlite. Add 1 tablespoon of lime or wood ash per five gallons to adjust the pH. Mix it all in a big tub, and water as you do to keep the dust down (and wearing a mask is not a bad idea)
There are many difference specifications for compost, depending on the intended use. The American Society of Landscape Architects has a set for a variety of applications, and many state Highway Departments do as well.