Germination Frustration with Soil Blocks
For the first time this year I have been trying to use soil blocks to germinate seed. I'm using 2 inch blocks.
I first tried using the starting mix recipe given by Eliot Coleman, a peat/phosphate/greensand/compost mix. I actually did get about a 5% germination rate for head lettuces. Given such poor results, I switched to using a (reduced) peat/compost/potting soil mix (both mixes also contain pearlite). This second recipe, minus the peat, gives me about 100% germination when used in cells or pots. Alas, the seed in the blocks refuses to sprout.
I've tried using lights indoors and growing outdoors, with the same results.
Have any of you had this problem and found a way to solve it?