Any all-purpose foliage fertilizer will work for Stromanthe Triostar Plants. Indoor houseplant fertilizers fall into two groups: water-soluble, liquid quick release, and granular, slow-release fertilizers. Jack’s Classic Indoor plant food is a powder, quick-release fertilizer, and when mixed with water, it quickly provides nutrients to container plants. Osmocote Indoor/Outdoor is a granular, slow-release fertilizer used while potting and planting. Any fertilizer offers nutrients that help plants transition to a new environment. Only fertilize the Stromanthe Triostar during its growing season. You should only do this during the spring or summer.