Cold hardy and later to bloom than other nectarines, this tree puts forth pink flowers in spring. Self-pollinating, (but better with a partner), the Harko nectarine bears red skinned, yellow fleshed fruit in early July. Grafted on Citation rootstock, this tree should grow to 12-18′ and should be planted in sun in a moist but well drained soil.. Mature Size: 12-18′ x 12-18′ after 5-7 years. Full Sun (6+ Hours).