If possible, fill each seed tray with seeds that have similar temperature requirements, and will take roughly the same amount of time to germinate, so that the seedlings are easier to care for.
If possible, fill each seed tray with seeds that have similar temperature requirements, and will take roughly the same amount of time to germinate, so that the seedlings are easier to care for. I sow cool season crops like lettuce and radishes in separate trays from warm season crops like tomatoes and peppers.