Professional Growing Information This was a stunner in my zone 9b bed. I used 4 in a row, planted in full sun. I could not be more pleased. One thing I really love is that the sepal is bright green, so when the bloom falls off the sepal also looks like a bloom . This a winner!
Summerific® 'Holy Grail' Rose Mallow Hibiscus hybrid
Exposure
- Part Sun to Sun
Flower Season
- Spring
- Summer
Mature Size
Height: 4' - 4'6"
Spread: 4'6" - 5'
Height: 1.2m - 1.4m
Spread: 1.4m - 1.5m
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Details
48 - 54 Inches54 - 60 Inches54 - 60 Inches1.2m - 1.4m1.4m - 1.5m1.4m - 1.5mFeatures
This is truly a special Hardy Hibiscus. Incredibly dark, near-black foliage hold 8-9” deep red flowers. Use as a focal point to your garden and be delighted in mid to late summer.
Best SellerAward WinnerLong BloomingFall InterestBog PlantAttracts:HummingbirdsResists:DeerNative to North AmericaCharacteristics
Plant Type:PerennialHeight Category:TallGarden Height:48 - 54 Inches 1.2m - 1.4mSpacing:54 - 60 Inches 1.4m - 1.5mSpread:54 - 60 Inches 1.4m - 1.5mFlower Colors:RedFlower Shade:Deep redFoliage Colors:BlackFoliage Shade:Near-blackHabit:UprightContainer Role:ThrillerPlant Needs
Light Requirement:Part Sun to SunThe optimum amount of sun or shade each plant needs to thrive: Full Sun (6+ hours), Part Sun (4-6 hours), Full Shade (up to 4 hours).
Maintenance Category:EasyBloom Time:Mid SummerHardiness Zones:4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9bWater Category:AverageSoil Fertility Requirement:Average SoilSoil Fertility Requirement:Fertile SoilSoil Fertility Requirement:Poor SoilSoil PH Category:Acidic SoilUses:Border PlantUses:LandscapeUses:Specimen or Focal PointUses Notes:See more red flowers and plants. Growing Guide: Rose Mallow
Maintenance Notes:Hibiscus love the sun and need moist, well-drained soil. Keeping these plants watered will result in larger flowers and lush foliage. Deadheading will improve the appearance of the plant, but is not necessary for continued bloom. It is best to plant Hibiscus in the garden before the heat of the summer arrives, and should be heavily mulched the first winter. In spring, cut back any remaining stems before new growth appears. Do not trim back in fall. A strong pair of loppers or a saw will be necessary to cut this plant back. Be advised that Hibiscus is always one of the last perennials to emerge in spring. Be patient, even if you think it is dead, it most likely isn't. Its vigorous growth rate more than makes up for this late start, however. Japanese beetles find these plants especially delicious.
Summerific® 'Holy Grail' Hibiscus hybrid USPP 31,478, Can 7,071 -
12 Reviews
5124321Browse reviews from people who have grown this plant.-
Terry Smallwood, Alabama, United States, 30 weeks ago
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I purchased 2 of these from Proven Winners website last summer. They came beautifully packaged and cared for directly from the grower. They were quite small but reasonably sized for the price. I put them in the ground immediately even though it was later in the summer. They did double in size but no flowers the first year. I was excited to see them suddenly sprout in early June. They are still smaller than their maximum about 3.5 feet tall and a little sparse. I think they need another year or two to fill out. But when they started blooming this year it was just glorious. Huge dark red blooms as advertised and full of buds even though the shrub is still small. I can’t wait for them to reach their full size. I have now ordered 2 French Vanilla hibiscus from PW to compliment the Holy Grail. I love being able to buy direct from PW as I find it difficult to find the exact things I want from local nurseries.
KelzSTL, Missouri, United States, 3 years ago -
I have 2 and wish I bought more as my sursery didn’t carry any this year… huge dinner plate sized blooms and plant has grown greatly in its 2nd summer even after the freak 3 day Texas snow storm. I didn’t do anything to protect it but it came back with gusto. Going to redo all my front flower beds to have these big beauties.
Teri Gooden, Texas, United States, 3 years ago -
I've purchased a number of plants from PW and this by far is the star! I have it in full sun and there are already so many buds on it, that it will certainly take center stage again this summer. It's already grown to 36 inches since last year. As the others have mentioned, the dark leaves make a striking contrast with the beautiful red flowers. Haven't seen it in any stores in this area. Some of my online purchases were so so, but this is a winner!
Brenda Jefferson, Georgia, United States, 4 years ago -
I planted mine in containers early this summer. They grew and performed well on my deck all summer. The blooms were amazing and 8-9 inches wide! They are rather 2 dimensional and blooms parallel to your view are not as noticeable. I was able to turn the containers to face the deck when I was removing the spent flowers. When I wasn’t able to pick up the blooms they got a little messy. The blooms have now finished and the plants are losing leaves. Now I notice that they are infected with white flies. We will probably have our first frost later this week. What is the best method / time to treat these plants for white flies? Will they survive over winter? Thanks
Bryan Reep, North Carolina, United States, 4 years ago -
This plant is perfectly named. It is definitely the holy grail of hibiscus! Not only are the flowers themselves absolutely stunning, the leaves are equally striking. The flowers are a rich, deep red, and the leaves are a beautiful purple/dark green color - they complement each other so well! There have been at least 2-3 blooms a day since I planted it 2 weeks ago in mid-late August. It's definitely the show-stopper in my garden. I'll be on the lookout for more at my favorite nursery for sure!
Meghan, Tennessee, United States, 4 years ago -
First year gardener and this has outperformed everything! Definitely a show stopper! Absolutely beautiful. So many buds and the flowers are bigger than my head. Just curious if it produces seed pods? They start to turn tan colored then fall off.
Ryan Rosenberg, Oklahoma, United States, 4 years ago -
I was a little worried when I rec'd this plant, I ordered 2 & one of them was a little messed up in the shipping. I decided to plant it anyways. Boy am I glad I did. It has grown so big & I have lots of buds on it. Can't wait for them to bloom!!! So pleased with it that I just ordered 2 more.
Bernadette Vanas, Maryland, United States, 5 years ago
1 Award
Award Year Award Plant Trial 2020 Consumer Top 10 - Perennial University of Guelph 15 More colors
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