The Argyle Apple (Eucalyptus cinerea) is an evergreen tree native to southeastern Australia, known for its distinctive silvery-blue, rounded leaves often used in floral arrangements. Its unique foliage makes it a popular ornamental choice, well-suited to similar climates worldwide.
Characteristics of Argyle Apple
The Argyle Apple’s most notable feature is its juvenile leaves. These rounded or egg-shaped leaves, about 2 inches long, display a striking silvery-bluish-green color, earning it the common name “silver dollar tree.” This attractive juvenile foliage often persists into maturity, distinguishing it from other eucalyptus species. Mature leaves are longer, lance-shaped, and darker green, though less prominent.
The tree’s bark is also distinctive. On young stems, it is reddish-brown and may peel, while on mature trunks and larger branches, it becomes thick, fibrous, and rough, appearing gray or reddish-brown and shedding in strips. Eucalyptus cinerea reaches heights of 25 to 60 feet with a spread of 20 to 50 feet. It has a fast growth rate, potentially gaining 6 to 8 feet in height each growing season. Small white flowers, often lacking petals, appear in clusters, followed by woody, conical to bell-shaped fruit. Flowers are rarely seen on young trees or those grown in containers.
Growing Conditions and Care
The Argyle Apple thrives in full sun, requiring at least six hours of direct sunlight daily. It is suited for outdoor cultivation in USDA hardiness zones 8 through 11, tolerating temperatures as low as 18°F (-8°C). It can be grown as an annual or container plant in colder climates, often recovering after cold damage.
Well-draining soil is important, and the plant tolerates sandy, loamy, and clay types. It prefers a slightly acidic to neutral soil pH. Once established, Eucalyptus cinerea is drought-tolerant, but young trees need moderate, consistent watering for deep root growth. Water deeply when the soil is almost dry to prevent root rot, especially for container plants.
Pruning helps maintain shape, promote bushy growth, or encourage juvenile foliage retention. The best time for pruning is late winter or early spring before new growth, also allowing removal of dead or damaged branches. Established trees in the ground generally do not need fertilization. Container-grown plants may benefit from a balanced fertilizer (e.g., 10-10-10 N-P-K) during the growing season to replenish nutrients, avoiding over-fertilization.
Uses and Benefits
Beyond its ornamental appeal, the Argyle Apple’s aromatic leaves are popular for bouquets and dried displays, prized for their long-lasting freshness and pleasant fragrance. This tree also serves practical purposes.
It is suitable for shade or windbreaks, offering quick screening. Eucalyptus cinerea benefits local wildlife; its flowers attract pollinators like bees, and shredded bark is used by birds and rodents for nest-building. The leaves contain essential oils, primarily 1,8-cineole, utilized in aromatherapy and traditional remedies.
Common Issues and Solutions
The Argyle Apple generally has no serious insect or disease problems, making it a low-maintenance plant. Growers should monitor for common eucalyptus pests like scale insects or borers.
Potential diseases include fungal issues like silver leaf or oedema, especially in overly moist conditions. Proper watering and good air circulation help prevent many disease occurrences. Poor growth can result from inadequate drainage; ensure well-draining soil. While drought-tolerant, prolonged dry periods can cause leaf drop, indicating a need for occasional deep watering. Sufficient sunlight also contributes to vigor and stress resistance.