Evan,
I use controlled release fert on my breeding Caladiums (18-6-8 Nutricote) supplemented by weak applications of Miracle Gro soluble (1 Tsp/5 gallons + Superthrive) applied once or twice a week. Regular Caladiums respond well to this regimen but it is a MUST for Thai Caladiums if you want them to come up the following year. Thai tubers are so much smaller than Western ones that you've got to get all you can get in the growing season.
LariAnn
