Hi -- My toddler planted sunflower and zinnia seeds in plastic egg cups inside an egg carton at daycare last week, and they are sprouting like mad, but the egg carton won't contain them long. Several are already towering over their little egg cups on the kitchen table by almost four inches. I know nothing about gardening. I can't just bury the egg cups since they're plastic, not biodegradable (also we are under water restrictions in my area and aren't allowed to plant anything in the ground). I've looked up transplanting zinnias but haven't seen much on how big a pot they would need (I don't know how big the zinnias are intended to grow -- I'll try to remember to ask her daycare teacher) or how far apart to space them in a pot. I have some really big pots that don't have anything but potting soil in them, but I don't know if they're appropriate. Can anyone instruct me on moving these to a pot -- how big should the pot be, do I need special soil, can I put more than one seedling in each pot, etc.? Thank you!