Holy Grail Rose Mallow

Holy Grail Rose Mallow

Proven Winners®
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  • Hibiscus x Summerific® Holy Grail PP31,478
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Pairs well with

Deep red flowers measuring nearly 9 inches across bloom against dark, near-black foliage. This plant offers the darkest leaves of any hardy hibiscus and creates a stunning focal point.

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Size at Maturity

Height 4'- 5' Spread 4'- 5'

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Growing Zone

USDA Hardiness Zones 4-9

Lowest Temperatures -30°F to -20°F

Light Requirements

Full sun to part sun- at least 4 hours direct sun per day

Wildlife Benefits

  • Supports Bees
  • Attracts Hummingbirds
  • Attracts Butterflies

Special Conditions

  • Deer Resistant
  • High Salt Tolerance
  • Wet Soil

Seasons of Interest

  • Summer
  • Fall

How to Plant

Give your new plant the best start possible. Click here for general planting instructions.

Grow With Confidence

We stand behind every plant we ship. Click here to view our warranty.

Planting and Care Guide

Planting Tips

Plant in moist, well-drained to average soil. Space 3–4 feet apart. Water thoroughly after planting and mulch generously. Mark the crown- hardy hibiscus is very late to emerge in spring.

Care Tips

Water consistently throughout the growing season. Blooms on new wood- cut back to 6 inches from the ground in early spring. Fertilize in spring with a balanced slow-release fertilizer. Largely pest-free. Holy Grail produces enormous, richly colored flowers- a vivid, dramatic color combination that makes it feel like a rare treasure. Produced continuously from midsummer through fall. Very late to emerge in spring- do not assume it has died before late May or June.

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