Alphabetical Plant Listing

Hibiscus 'Holy Grail' (Rose Mallow)

Rose Mallow 'Holy Grail', Hardy Hibiscus 'Holy Grail', Summerific Collection


Noted for its dark foliage and long blooming season, Hibiscus 'Holy Grail' (Rose Mallow) is a compact, well-branched, deciduous shrub with extremely large, deep red flowers, up to 9 in. across (22 cm). The eye-catching blossoms open from abundant flower buds which cover the plant all the way up the stems, making it bloom for much longer than most Hibiscus. Blooming continuously from midsummer to fall, each flower lasts about one day and stands out against the incredibly near-black foliage of beautiful, oval-shaped leaves. As an added bonus, once the flowers are finished, their bright green calyxes starkly contrast with the dark foliage. Perfect backdrop or centerpiece for a sunny border. Great for containers too.

  • Typically grows up to 4-5 ft. tall and wide (120-150 cm).
  • A full sun to part shade lover, this plant is best grown in average, medium moisture, well-drained soils.
  • Fairly pest and disease free. Watch for aphids, mealybugs and thrips. Deer resistant.
  • Plant in shrub borders or large containers for dramatic summer blooms.
  • Cut it down in spring before new growth appears.

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Requirements

Hardiness 4 – 9
Heat Zones 1 – 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hibiscus
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid,Late)
Fall
Height 4' – 5' (120cm – 150cm)
Spread 4' – 5' (120cm – 150cm)
Spacing 60" (150cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Tolerance Deer
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles City and Courtyard, Informal and Cottage

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Photo courtesy of Walters Gardens Inc

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 4 – 9
Heat Zones 1 – 8
Climate Zones 2A, 2B, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hibiscus
Exposure Full Sun, Partial Sun
Season of Interest Summer (Mid,Late)
Fall
Height 4' – 5' (120cm – 150cm)
Spread 4' – 5' (120cm – 150cm)
Spacing 60" (150cm)
Water Needs Low, Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Tolerance Deer
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles City and Courtyard, Informal and Cottage

Great Plant Combination Ideas with Hibiscus

Guides with Hibiscus

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