Planting depth varies with the size of the bulb (corm). Large corms should be planted 4 to 6 inches deep and 6 inches apart. Small corms should be planted at a depth of 3 inches. You need to provide some room for roots—2 to 4 inches of soil, depending on the size of the corm. But be prepared to stake the plants, too; the root systems are not very robust (strong).
Planting depth varies with the size of the bulb (corm). Large corms should be planted 4 to 6 inches deep and 6 inches apart. Small corms should be planted at a depth of 3 inches. You need to provide some room for roots—2 to 4 inches of soil, depending on the size of the corm. But be prepared to stake the plants, too; the root systems are not very robust (strong).