Purple cestrum is a semi-woody shrub native to southern Mexico that transforms gardens into hummingbird havens with nearly continuous blooms in warmer climates. Its arching, hairy stems reach 6 to 10 feet tall with an equal spread, clothed in pointed, elliptic leaves and crowned by showy clusters of red-violet tubular flowers that peak from spring through summer. Hardy in zones 8 through 11, it thrives in full sun to partial shade and tolerates dry soil once established, making it surprisingly adaptable for a plant that looks this exotic. In cooler climates, grow it as an annual or tender perennial for reliable summer color.
Partial Sun
Moderate
8-11
120in H x 120in W
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High
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The nearly continuous bloom cycle in warm regions sets purple cestrum apart; even in cooler zones, you'll enjoy months of nectar-rich flowers that draw hummingbirds and other pollinators straight to your garden. Red-violet blooms measure 1.5 inches long and form in dense terminal clusters with enough visual punch to work as a cut flower. The plant grows quickly and handles occasional dry spells, rewarding you with vigorous arching growth that can reach 10 feet if given space and support.
Purple cestrum shines as an ornamental shrub valued for its dramatic summer bloom and magnetic appeal to hummingbirds and pollinators. The flowers are suitable for cutting, bringing vivid color and delicate clusters into fresh arrangements. In zones 8 through 11, it anchors mixed borders and provides vertical interest on trellises or as a specimen shrub; in cooler climates, treat it as an annual focal point for containers or garden beds.
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Transplant outdoors after all risk of frost has passed, when soil has warmed. In zones 8 through 11, plant in spring for best establishment before summer heat.
Prune purple cestrum to shape and encourage fuller, bushier growth, particularly on young plants. Its fast growth rate responds well to regular pruning throughout the growing season, which will increase flower production and help manage its spreading 6 to 10 foot habit.
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“Cestrum elegans originates from the warm regions of southern Mexico, where its arching stems and magnetic flowers have long attracted local pollinators. The species made its way into cultivation through the plant trade, eventually reaching gardens across the warm-climate zones of North America. Its dual nature, equally at home as a shrub in mild climates or an annual display in cooler regions, reflects its origins as a tender perennial adapted to tropical and subtropical conditions.”