There is an interesting type of Ligustrum tree which is ideal for growing in containers. It has lovely golden leaves, and can be pruned to control its growth.
When they're ready for replanting in a pot or in the garden, save the mini greenhouse you created from that leftover clamshell container for next season or use it for another purpose in the off-season ...
Tom MacCubbin gives advice on gardening in Florida including care of impatiens, poinsettias, squash, crape myrtles, ginger plants, hydrangeas and plumeria.