Bold Rose of Sharon with Vibrant Double Red Blooms
Althea 'Amplissimus' (Rose of Sharon) is a striking flowering shrub that delivers dramatic color with its abundant double red blossoms throughout late summer. This medium-sized, upright variety reaches 8–10 feet tall and 4–6 feet wide with bright green serrated leaves and a slender, well-branched form. Easily grown and tolerant of a wide range of soil and moisture conditions, Amplissimus is perfect for mixed borders, privacy screens, or as a standout specimen plant that commands attention.
Key Features
Vibrant Double Red Blooms — Abundant, fully double flowers in rich red create bold, eye-catching appeal
Late-Summer Flowering — Profuse blooms in late summer provide color when few other shrubs are flowering
Upright, Slender Form — Well-branched growth habit ideal for narrow spaces and vertical accents
Easy to Grow — Tolerates wide range of soil types, moisture levels, and urban conditions
Cold Hardy — Reliable performance in zones 5–9; hardy to -10°F
Growing Tips
Althea 'Amplissimus' thrives in full sun with well-drained soil. Tolerates partial shade but blooms best in full sun. Water regularly during establishment, then reduce frequency once established—somewhat drought-tolerant. Prune in late winter or early spring to maintain shape and encourage vigorous flowering. Can be trained as a small tree or used as a screen. Attracts butterflies and hummingbirds. Deer-resistant.
Container Size: 3 gallon Light: Full sun to partial shade (best blooms in full sun) Water: Moderate; drought-tolerant once established Spacing: 4–6' apart Mature Size: 8–10' tall × 4–6' wide Hardiness: Zones 5–9; hardy to -10°F
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