Elephant Ear Fuel Plant Fertilizer – Water-Soluble 20-10-20 – (1 or 2 LB bag) With our premium 20-10-20 Elephant Ear fuel, your Alocasias and Colocasias will thrive. Instructions are included. With our premium 20-10-20 Elephant Ear fuel, your Alocasias and Colocasias will thrive.