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Living Soil
Definition: Living soil is a growing medium rich in organic matter and active microorganisms, such as bacteria, fungi, and worms, that break down amendments and make nutrients available to plant roots over time. Growers using living soil typically water with plain water and top-dress amendments instead of feeding bottled mineral fertilizers.
How Living Soil works
In a living soil, you feed the soil life and the soil life feeds the plant. Microbes break down compost and natural amendments into forms roots can absorb, and beneficial fungi extend the root system’s reach.
A classic starting recipe
- About one-third compost or worm castings.
- About one-third aeration, such as perlite, pumice, or rice hulls.
- About one-third peat moss or coco coir as the base.
- Amendments mixed in: kelp meal, seed meals, gypsum, rock dust, and bone meal are common.
Mix it, keep it moist, and let it rest a few weeks so the biology gets established.
Containers matter
Living soil works best in larger volumes, ideally 10 gallons or more per plant, or in raised beds. More soil means a larger, more stable microbial population and fewer swings in moisture and temperature. Many growers practice no-till, reusing the same soil cycle after cycle and adding fresh amendments on top.
Pros
- Forgiving pH, because organic matter buffers it.
- Little or no bottled feeding.
- Many growers report rich aroma and flavor from organically grown flower.
Cons
- Slow to correct a deficiency, since amendments take days or weeks to break down.
- Heavy containers and more floor space.
- Constantly moist organic soil can attract fungus gnats.
City water treated with chloramine can harm soil biology over time, so many living-soil growers run tap water through a carbon filter first.