Sand Dollar Eucalyptus, scientifically known as Eucalyptus polyanthemos, is a highly favored ornamental plant. Often called Silver Dollar Gum or Red Box, this species is popular among gardeners and florists. Its unique foliage and aesthetic appeal make it a desirable addition to landscapes and indoor arrangements.
Unique Characteristics
The most recognizable feature of Sand Dollar Eucalyptus is its coin-shaped, juvenile leaves, typically 2 to 3 inches across, displaying a striking silvery-blue or grayish-green color. As the plant matures, these round leaves transition into more elongated, lance-shaped or oval forms, about 2.5 to 4 inches long, and may turn a deeper green.
The tree typically grows 30 to 75 feet tall, forming a dense, often domed canopy. Its bark varies from shaggy and fibrous on the trunk and larger branches to smooth and mottled, revealing shades of gray, cream, or pink on upper sections. Small, white flowers appear in clusters, followed by small, woody, pear-shaped or barrel-shaped seed capsules.
Ideal Growing Conditions
Sand Dollar Eucalyptus thrives in full, direct sunlight for at least six to eight hours daily. While it can tolerate some partial shade, optimal growth and foliage color are achieved with ample sun exposure. The plant prefers well-draining soil, adaptable to various soil pH levels, from slightly acidic to mildly alkaline. Good drainage is important to prevent root rot.
Once established, Eucalyptus polyanthemos exhibits significant drought tolerance, making it a suitable choice for water-wise gardens. Young plants require consistent moisture to develop a robust root system. This species is hardy in USDA Zones 8 through 11, tolerating moderate temperatures and some light frost. In colder climates, container growing with indoor overwintering is a consideration.
Planting and Ongoing Care
When planting Sand Dollar Eucalyptus, select a site with ample space for its mature size and well-draining soil. Dig a hole at least twice the width of the root ball and deep enough so the top of the root ball is slightly above the surrounding soil level. Backfill with soil and water deeply to settle it around the roots.
Young plants require regular watering to support root establishment during their first year or two. Established trees, being drought-tolerant, can be watered less frequently, allowing the soil to dry out between waterings. Fertilization is generally not heavily required for established plants; however, young plants can benefit from a balanced, slow-release fertilizer.
Pruning can manage size, shape the tree, or encourage the production of prized juvenile foliage by coppicing. The best time for structural pruning is late winter to early spring, before active growth begins. Sand Dollar Eucalyptus can be susceptible to beetle borers and, if overwatered, root rot.
Popular Uses
Sand Dollar Eucalyptus is highly valued for its ornamental appeal in landscape applications. It serves as a specimen tree, providing a focal point with its distinctive foliage and growth habit. Its moderate size and dense canopy also make it suitable for use as a privacy screen or windbreak.
The tree’s adaptability to various soil conditions and its drought tolerance once established enhance its utility in diverse garden settings. Beyond landscaping, the foliage of Sand Dollar Eucalyptus is popular in the floral industry. Its silvery-blue, round juvenile leaves are frequently used in fresh bouquets and dried arrangements, adding texture, color, and a refreshing aroma. Florists often prune the trees to encourage a continuous supply of this desirable juvenile foliage. The aromatic properties of eucalyptus leaves also lend themselves to use in crafts, potpourri, and essential oil extraction.