I chose 288 cell plug trays - which are much smaller cells - which work perfectly for small seedlings such as petunias and portulaca. When you plant multi-seed pellets - only plant one per cell or you will have to thin out a lot of plants which is a waste of money - and time.
When you are finished placing a pellet in each cell, cover lightly with vermiculite or planting mix - making sure its a fine layer. The pellet all provides some covering for the seed, so keep this in mind so you don't cover them too much and they won't sprout. After that, I place plastic dome on top to keep the soil moist and place under the grow lights on top of a heated mat. They need light to sprout.
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