Quercus palustris Pringreen Green Pillar ®

Description: Quercus palustris Pringreen Green Pillar®, commonly known as Green Pillar® Pin Oak, is a deciduous tree recognized for its narrow, columnar growth habit and vibrant autumn foliage. This cultivar is particularly valued for its space-saving form, making it ideal for urban settings and smaller landscapes where traditional Pin Oaks might be too large.

Flowers:

• Blooms: The tree produces inconspicuous greenish-yellow flowers in spring. These are not significant for ornamental value but are essential for the tree's reproductive cycle.
• Fragrance: The flowers have no notable fragrance.

Foliage:

• Leaves: The leaves are deeply lobed, glossy green, and turn to brilliant shades of red and bronze in autumn, providing striking seasonal interest.
• Seasonal Color: The foliage transitions from deep green in spring and summer to vibrant red and bronze in autumn before shedding.

Fruit:

• Fruit: The tree produces small, rounded acorns with a shallow cap. These acorns mature in autumn and provide food for wildlife.

Form and Size:

• Size: Typically grows 10-15 meters tall and 3-5 meters wide, forming a narrow, columnar shape.
• Habit: Upright and tightly columnar, making it suitable for various landscape uses where space is limited.

Growing Conditions:

• Climate: Thrives in temperate climates and is suitable for various regions in Australia. It can tolerate light frosts and is adaptable to urban conditions.
• Soil: Prefers moist, well-draining soils but can adapt to a variety of soil types, including clay and loamy soils. Avoid very dry, sandy soils.
• Sunlight: Best grown in full sun to ensure robust growth and optimal foliage color. Partial shade is tolerated but may reduce the intensity of autumn colors.
• Watering: Regular watering during the establishment phase is crucial. Once established, it benefits from consistent moisture, especially during dry periods.

Uses:

• Ornamental Tree: Highly valued as an ornamental tree for its attractive foliage, narrow form, and autumn colors.
• Street Tree: Ideal for planting along streets and avenues due to its upright form and minimal maintenance requirements.
• Screening and Hedges: Excellent for creating narrow screens or hedges in urban gardens and small spaces.
• Accent Plant: Can be used as an accent plant in larger landscapes or mixed borders.

Maintenance:

• Pruning: Prune in late winter to early spring to maintain shape, remove dead or diseased wood, and promote air circulation. Pruning helps to maintain a strong structure.
• Fertilizing: Apply a balanced fertilizer in early spring to promote healthy growth and vibrant foliage color.
• Pests and Diseases: Generally resistant to many pests and diseases. Monitor for oak wilt, leaf scorch, and galls, especially in humid conditions.

Notes:

• Hardiness: Hardy in USDA zones 4-8. In cooler regions of Australia, ensure protection from severe frost to prevent damage to young shoots.
• Companion Plants: Pair with other space-saving trees and shrubs, such as upright junipers and columnar hornbeams, to create a structured and visually appealing garden.

Propagation: Propagate by grafting in late winter or by sowing acorns in autumn.

Quercus palustris Pringreen Green Pillar®

Common Name: Green Pillar® Pin Oak

Botanical Name: Quercus palustris Pringreen Green Pillar®

Family: Fagaceae

Origin: Cultivated variety of Quercus palustris

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