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The Gardener’s Corner
Mary’s Seed Starting Mix
Mary’s Seed Starting Mix
1- Part Humic Compost
2- Parts Coir or Peat Moss
1- Part Perlite or Pumice
3- Parts Vermiculite
1- Part Worm Castings
Compost
Compost is the product resulting from the controlled biological decomposition of organic material. More
specifically, compost is the stable, humus-like product resulting from the biological decomposition of
organic matter under controlled conditions.
Coir
Coir is a natural fiber extract derived from coconut husk. The fibers are extracted from between the
texturized outer shell and the hard inter shell of the coconut. The fibers are screened, washed and
compressed into bricks.
Peat Moss
Peat moss, an organic material harvested from bogs in Canada and the northern United States, is an
effective component in a seed starting mix because it is lightweight but capable of retaining moisture.
Peat moss is inexpensive and readily available in any garden supply store, which is especially helpful if
you're making a large amount of seed starter.
Perlite or Pumice
Perlite and pumice are derived from volcanic activity. They are porous aggregates, meaning they are
added to a potting soil to improve long-term aeration and drainage. The addition of perlite and pumice
in a potting soil will also increase the moisture and nutrient retention.
Vermiculite
Vermiculite, made from mica, is a lightweight substance that provides excellent aeration while its
sponge-like consistency aids in water retention. Vermiculite also contains small amounts of trace
minerals, including potassium and magnesium. When mixing the ingredients, ensure the vermiculite is
evenly distributed.
Worm Castings
Worm castings are the result of vermiculture, which uses worms to break down organic matter. Worm
castings have higher levels of cytokinin and auxin than composted green waste, but worm castings
tend to have lower NPK values than composted green waste. Cytokinin and auxin promote cell
development and stimulate proper root development.