Hibiscus 'Holy Grail' PP 31,478

Holy Grail Hardy Mallow

3 Reviews
| 5 answered questions

Item #: 13759

Zones: 4a to 9b

Dormancy: Winter

Height: 54" tall

Culture: Sun to Part Sun

Origin: United States Hybrid

Pot Size: 3.5" pot (24 fl. oz/0.7 L)

Regular price $25.00
Regular price Sale price $25.00
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Hibiscus 'Holy Grail' is a 2018 Walters Gardens introduction that fulfilled their goal of creating a dark purple leaf hardy hibiscus with bright red flowers...a combination of traits that proved elusive previously. The 4.5' tall x 4.5' wide clump is clothed with dark purple foliage, and topped, starting in early summer with giant 9" wide, brilliant red flowers. Moist, rich, slightly acidic soils produce the best results.


Hibiscus 'Holy Grail' is a very low maintenance perennial, provided they are growing in the proper conditions. When the plants go dormant in winter, the stalks remain upright and sturdy. We prefer to leave them to give birds a place to perch. The structure also helps the garden remain much more interesting in winter than a flat carpet of brown mulch.

Hibiscus sawfly is the #1 pest of most hibiscus, causing skeletonized leaves. These can be treated with a beneficial bacteria product like Dipel, which contains BT bacillus.

Growing Conditions:

Hibiscus like 'Holy Grail' grow naturally in standing shallow water, although they are quite drought tolerant for short period. The drier the soil, the more the plants will be stressed, which increases the severity of insect damage.

Garden Value:

Perennial hardy hibiscus add an upright garden form to the garden, as well as summer flowering when many spring perennials have finished flowering or gone dormant. Also, there are few plants with such a floral show that tolerates wet soil.

Natural Impacts:

Bees are the primarily pollinators of all of the herbaceous, hardy hibiscus.