Chastetree 'Colonial Blue' is a deciduous shrub that brings summer elegance to temperate gardens with fragrant lavender-violet flowers held in graceful panicles. Hardy in zones 6, 8, this aromatic Mediterranean native grows 3, 15 feet tall depending on your climate and training method, producing tiny, showy blooms from July through August that attract butterflies in abundance. In colder zones, it often behaves as a herbaceous perennial, dying back to the roots in winter but reliably returning with vigorous new growth that flowers the same season.
Full Sun
Moderate
6-8
180in H x 180in W
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High
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The flowers arrive in loose, foot-long panicles of delicate lavender to pale violet, each tiny bloom releasing a distinctive aromatic fragrance that fills the garden. Its finely divided, grayish-green leaves with lance-shaped leaflets add textural interest even before bloom time arrives. Plant it in full sun and moderate moisture, and you'll have a shrub that pollinators flock to year after year, with especially reliable performance when sited in sheltered locations that protect it from harsh winter winds.
Chastetree serves as an ornamental garden shrub, valued for its summer flowering period and ability to draw butterflies and other pollinators into the landscape. Its aromatic foliage and showy flower displays make it a focal point in shrub borders, particularly in gardens where attracting beneficial insects is a priority.
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Pruning encourages bushier growth and promotes flowering on new wood. Since this shrub produces flowers on new growth, pruning in late winter or early spring before growth resumes will enhance bloom display. In zones 5, 6 where winter dieback occurs naturally, you may not need to prune; simply remove any dead wood once new growth emerges in spring. Shape the plant to your preferred form, whether as a multi-stemmed shrub or trained as a single-trunk tree.
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