I have struggled for years to find the best seed starting mix. I have never been happy with a peat based mix. Peat moss hates water, and you have to really work at it to get it wet. Once it dries out, it repels water again, and you need to work at soaking the water back in to your pot. I have seen it many times where I water my plants, only to have the water run down the sides of the peat block in the pot, run out the bottom, and my plants don't get any water and are all dried out. And then I found coconut coir. It loves water, and absorbs it readily. My plants have thrived with this wonderful 'soil.' Mixed with pearlite and vermiculite and some worm castings for fertilizer, and it's a great seed starting mix.
For the small mix, you get one 250 gram coconut coir block, 2 cups of pearlite, 2 cups of vermiculite, and 1 cup of worm castings. The large mix has one 650 gram coconut coir block, 5 cups of pearlite, 5 cups of vermiculite, and 2 cups of worm castings. To make your mix, just rehydrate the coconut coir in warm water, add the pearlite, vermiculite and worm castings and mix. It's that easy.
The small mix makes enough to fill a jiffy easy grow greenhouse with some left over. The large makes a big tub of mix, about 3-4 gallons, and enough to start a lot of plants.
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This is the best seed starting mix. Very absorbent and just plain fun to mix up!
I bought the large and it filled 3-72 cell seed starter containers and there is enough left over to start my potatoes my 9-gallon potato starter bag. I loved how it absorbed water instead of repelling it like other seed starting mixes out there.