I just bought Icebox watermelon seedlings from the nursery. The instructions just say to stick the whole batch into the ground (the inner cardboard is biodegradable). I think these are just generic instructions that appear on all the various seedlings that Bonnie sells. I'm wondering whether I need to do something extra for watermelon in particular. It appears like there are three seedlings. Do I need to space them apart or can I just plant them as is?