Lovely peas! What are you using for starting mix?
Burpee’s organic seed starting mix. Walked by it at Menard’s and my arm just reached out and grabbed it. I had made my own from peat, biochar and a little 2 year old sifted goat manure but when I bottom watered the tray which was half burpee and half mine, mine didn’t pick up the water so I dumped mine out and refilled with burpee.
Just now started 4 broccoli, 8 collards and 4 each of southern giant and Japanese giant mustards in my coffee creamer container bottom pots. Started those in some DG potting soil that I got last year. It’s pretty chunky so I dropped the seeds on top and then added 1/4” of the burpee to cover and then pressed with another pot.
My second heat mat should be in tomorrow to go under those. Those coffee creamer pots measure 3 inches across and 24 of them just fit inside a lid to a tote, 4 wide by 6 long - 12”x24” so the 1020 mat should work fine.