Coast Redwood ‘Korbel KT’ 40/60cm (5L)

The Coast Redwood ‘Korbel KT’ is an exceptional columnar cultivar that brings the majesty of California’s giant redwoods to gardens in a more manageable form. Developed by W.J. Libby and K. Tufuor at the University of California, this remarkable selection grows at approximately half to one-third the rate of typical Coast Redwoods, making it an outstanding choice for those seeking the architectural presence of Sequoia sempervirens without the overwhelming scale of the species.

What sets ‘Korbel KT’ apart is its distinctively dense, columnar habit and unique foliage characteristics. The shoots display radial symmetry, creating an exceptionally full appearance from every angle. On juvenile trees, the blue-green foliage maintains its attractive colour throughout winter, providing year-round interest when many other conifers lose their vibrancy. The lower branches often exhibit a charming upturned habit, adding to the cultivar’s distinctive silhouette and creating an elegant, layered effect as the tree matures.

This slower-growing selection is perfectly suited to British gardens where space may be limited but the desire for a statement evergreen remains strong. Its narrow, columnar form makes it ideal as a focal point, for framing entrances, or creating dramatic vertical accents in mixed borders. The dense foliage provides excellent screening and shelter, whilst the manageable growth rate means less frequent maintenance compared to the vigorous species.

Growing ‘Korbel KT’ in British Gardens

Plant your Coast Redwood in a sheltered position with moist, well-drained soil. Whilst these trees tolerate a range of soil types, they perform best in slightly acidic to neutral conditions with good organic content. Choose a site protected from harsh winds, particularly when young, though established specimens develop considerable resilience.

Water regularly during the first two growing seasons to establish a deep root system. Once established, ‘Korbel KT’ tolerates typical British rainfall well, though supplementary watering during extended dry periods benefits growth and foliage quality. The naturally humid atmosphere in many parts of Britain suits this species admirably.

Apply a generous mulch of organic matter around the base each spring, keeping it clear of the trunk. Feed annually with a balanced fertiliser in early spring to support healthy growth. The slower growth rate means less intervention is required compared to faster-growing conifers.

Pruning is rarely necessary due to the naturally neat, columnar habit. If required, remove any damaged or wayward branches in late winter. The dense growth pattern means the tree naturally maintains its shape without intervention. In exposed locations, stake young trees for the first two years to ensure straight growth.

‘Korbel KT’ thrives in Britain’s mild, moist climate, particularly in western regions where atmospheric humidity remains high. It tolerates coastal conditions reasonably well, though some shelter from salt-laden winds is beneficial. Hardy and reliable, this cultivar develops into a magnificent specimen that combines the grandeur of the world’s tallest trees with garden-friendly proportions.

Ultimate height
Higher than 12 metres

Time to ultimate height
20–50 years

Ultimate spread
4–8 metres