Light Needs
Mature Height
Mature Spread
Growing Zones
Summerific Holy Grail Hibiscus is a hardy version and will look great in your yard! It has almost black foliage that is paired with large deep red blooms. This one brings hummingbirds to your yard while looking amazing. This award winner is native to North America and resistant to deer.
The foliage is as interesting as the blooms. It is deep near-black in color and provides fall interest. The blooms are a large eight to nine inches and deep red. This upright perennial falls into the tall category reaching a height of forty-eight to fifty-four inches tall and fifty-four to sixty inches wide. The Summerific Holy Grail Hibiscus has a long bloom season that lasts from summer to fall. This hibiscus makes an unforgettable focal point. It is a great border plant, and does well in mass planting. Plant in containers as a thriller or spiller.
Summerific Holy Grail Hibiscus Care
Plant in full sun to part sun, ensuring it receives four to six hours of sun per day. Water needs are average. Soil should be well-drained and moist. Plant your Summerific Holy Grail Hibiscus in acidic soil. It is tolerant to all types of soil. Trim down in the spring prior to new growth. Apply slow release fertilizer in the spring. Mulching in the winter can be beneficial.
Summerific Holy Grail Hibiscus Spacing
The Summerific Holy Grail Hibiscus grows to be 48”-54” inches tall, spacing is important when used for border or mass planting. Spacing for this plant should be 54”- 60” inches, center on center.
Summerific Holy Grail Hibiscus Plant Facts
| USDA Hardiness Zones: 4-9 |
| Flower Color(s): Red |
| Bloom Period: Summer to Fall |
| Foliage Color(s): Black |
| Light Exposure: Partial Sun to Full Sun |
| Height Class: Tall |
| Height: 4-4.5 Feet |
| Spread: 4.5-5 Feet |
| Spacing: 4.5-5 Feet |
| Habit: Upright |
| Watering: Average |
| Drought Tolerant: No |
| Resists: Deer |
| Attracts: Hummingbirds |
| Features: Fall Interest; Long Blooming |
| Scientific Name: Summerific® Holy Grail Hibiscus hybrid USPPAF |
| Common Name: Summerific® Holy Grail Hibiscus |
| Other Name(s): Rose Mallow; Hardy Perennial Hibiscus; Swamp Mallow |
| Brand: Proven Winners |
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Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
We stand behind our plants with industry-leading guarantees to give you peace of mind.
We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2026 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!