The Coast Redwood ‘Simpson Silver’ is an extraordinary cultivar that brings a touch of silvery magic to British gardens. Discovered as a naturally occurring tree near Long Prairie Creek, California, in 1975, this remarkable variety was swiftly introduced to cultivation by the Saratoga Horticultural Research Foundation. What makes ‘Simpson Silver’ truly special is the distinctive silvery-blue hue adorning the upper surfaces of its needle-like leaves, creating a stunning contrast against the typical rich green foliage associated with coast redwoods.
This striking coloration is believed to result from a genetic mutation affecting leaf pigmentation, transforming an already majestic tree into something truly eye-catching. The silvery-blue tones shimmer beautifully in sunlight, creating an almost ethereal quality that changes throughout the day and seasons. As a faster-growing coastal redwood, ‘Simpson Silver’ offers gardeners the advantage of establishing an impressive specimen more quickly than many other cultivars, whilst retaining all the architectural grandeur that makes Sequoia sempervirens so beloved.
The soft, feathery foliage creates wonderful textural interest in larger gardens, whilst the elegant conical form provides year-round structure and presence. This cultivar maintains its distinctive colouration throughout the seasons, offering consistent visual appeal whether bathed in summer sunshine or dusted with winter frost. The reddish-brown bark becomes increasingly fissured and fibrous with age, adding another dimension of interest to mature specimens.
Growing ‘Simpson Silver’ in British Gardens
This magnificent conifer thrives in the mild, moist conditions typical of British gardens, making it surprisingly well-suited to our climate. Plant in a sheltered position with protection from strong winds, particularly when young, as the silvery foliage can be susceptible to wind scorch. Choose a location with moist, well-drained soil that’s rich in organic matter – coast redwoods naturally grow in areas with high humidity and appreciate consistent moisture levels.
Full sun to partial shade suits ‘Simpson Silver’ best, though it will develop the most intense silvery-blue colouration when grown in good light. Water regularly during the first few growing seasons to establish a deep, extensive root system, and continue watering during prolonged dry spells even once established. Apply a generous mulch of organic matter around the base each spring to conserve moisture and suppress weeds.
Feed annually in early spring with a balanced, slow-release fertiliser to support vigorous growth. Pruning is rarely necessary beyond removing any dead, damaged or crossing branches in late winter. The naturally pyramidal form requires little intervention to maintain its elegant shape. Protect young plants from severe frost in their first winter, though established specimens prove remarkably hardy.
Monitor for adequate moisture during summer months, as drought stress can cause foliage browning. In exposed gardens, consider providing a windbreak whilst the tree establishes. This cultivar grows faster than typical coast redwoods, so ensure you’ve allowed sufficient space for its ultimate dimensions when planning your planting position.
Ultimate height
Higher than 12 metres
Time to ultimate height
20–50 years
Ultimate spread
4–8 metres
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