Summerific ‘Holy Grail’ Hibiscus
Hibiscus hybrid ‘Holy Grail’ USPPAF 31478
Other Common Names:Â Holy Grail Rose Mallow, Holy Grail Hardy Hibiscus
Plant Details
USDA Plant Hardiness Zones: 4a-9b  Find Your Zone
Plant Type:Â Deciduous Flowering Shrub
Height at Maturity:Â 4′-4.5′
Width at Maturity:Â 4.5′-5′
Spacing:Â 4′ for solid hedges;Â 8′ for space between plants
Growth Habit / Form:Â Upright, Mound
Growth Rate:Â Moderate to Fast
Flower Color: Deep Deep Red
Flower Size:Â Large, 8-9″!
Flowering Period:Â Summer into Fall
Flower Type:Â Single
Fragrant Flowers:Â No
Foliage Color:Â Near Black
Fragrant Foliage:Â No
Berries:Â Â No
Berry Color:Â NA
Sun Needs:Â Full Sun or Mostly Sun, Morning Sun with Dappled or Afternoon Shade, Morning Shade with Evening Sun
Water Needs:Â Â Average, water regularly during extreme heat or drought
Soil Type:Â Â Clay (amended), Loam, Sand (amended), Silt
Soil Moisture / Drainage:Â Moist But Well Drained
Soil pH:Â 5.5 – 7.5 (Acid to Slightly Alkaline)
Attracts:Â Butterflies, Hummingbirds, Visual Attention
Resistances:Â Deer, Disease, Heat
Maintenance / Care:Â Low to Average
Description
One of if not the most impressive of the hardy Hibiscus we’ve ever laid eyes on, ‘Holy Grail’ might well be the holy grail of Hibiscus! It is definitely a super-special one adored for both its foliage and flowers. Dinnerplate-size deep red flowers come early to mid summer and continue well into fall contrasting beautifully with the incredibly deep near-black foliage. This cold hardy Hibiscus makes an unforgettable focal point with bold color and texture for a tropical look and feel to landscapes in USDA Zones 4 to 9.
Landscape & Garden Uses
Growing 4 to 4.5 feet tall and 4.5 to 5 feet wide, the Holy Grail Hibiscus makes a bold and beautiful specimen in the landscape or in large containers. Especially impressive in groupings of three or as a colorful hedge. Because it blooms all summer and into fall, and has such bold foliage, it makes a nice backdrop or centerpiece in flower gardens. A natural in butterfly and hummingbird gardens and for adding a tropical flare to your outdoor living spaces.
Suggested Spacing:Â 4 feet apart for hedge;Â 8 feet or more apart for space between plants
Growing Preferences
Hardy Hibiscus are very easy to grow. They prefer a moist but well-drained soil and plenty of sunshine, though some shade is tolerated. During prolonged periods of summer drought plants will appreciate supplemental water to bloom their best. Maintenance is minimal requiring just one pruning a year to prune plants back to ground when new growth begins to emerge in spring.
Helpful Articles
Click on the link below to find helpful advice from our experts on how to plant, prune, feed and water Hardy Hibiscus plants.
How To Plant And Care For Perennial Hibiscus
Plant Long & Prosper!
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