Lemon Bush Eucalyptus – Eucalyptus citriodora Lemon Bush. Type: Perennial. USDA Zones: 9 – 10. Height: 3 – 4 feet. Spacing: 18 – 24 inches apart. Light Requirements: Full sun to partial shade. White blossoms in the summer. Sword-shaped gray-green, silver-gray, to light green leaves. A hint of red fall foliage color change. When brushed the leaves release a unique citrus spice fragrance. Lemon Bush Eucalyptus – Eucalyptus citriodora Lemon Bush will come in a 4-inch container and will be fully rooted. Great Plant To Repel Mosquitoes. Click Here To Order.