I just watered my seedlings and I like to see how much water is added to each pot. Some say that bottom watering encourages deeper roots and I understand the theory. It makes sense but my seedlings always have roots coming out the bottoms of the pots when they are ready to transplant so I am not going to change my methods. I don't really like the idea of water sitting in the bottom of the trays.
It may be different with hundreds of seedlings but I only have 2 trays and I water them every day. Sliding the trays out also shakes the plants a bit. I do not use a fan.
I also slide my trays out from under the lights to water them with a small plastic watering can with a spout. It is the kind that people use for houseplants.
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