You can use anything that holds dirt.
Poke a hole in the bottom of them and put them in your platic trays.
If frost is no longer a problem in your area you could probably just plant them outside.
Put them in well drained soil.
Fertilize once a month.
They are a very pretty flower.
Won first prize at the county fair with them.
If a disease doesn't kill them and a bug doesn't eat them there may be something left for you.
Zone 47 Sector C