To grow roots from the corms often found in Alocasia roots, make sure to plant the extracted corm in an upright position in moist and covered soil. Others have found the corms easier to root in water. To do so, make sure the tip of the corm is above water. You can try placing the corm inside a small bottle cap, and use the bottles that came with the cap as a humidity dome. Roots may take 1-4 months to form.