Cold weather will do it. They look good other than the obvious great jobGetting off to a slow start due to cold weather and not much sunshinethis pic was taken at day 20 from planting. Starting to really come into it though ! View attachment 3949945
Ive grown amazing fire plants in clay soil before but I broke it up to tiny pieces all the dirtCorn field dirt will get compact and hard which isn't good for root growth. They will still grow in it but certainly not the best to grow in. I'd run with what DankBudzzz said.