Illustration
Blackberry Merlot Hibiscus
Hibiscus 'Blackberry Merlot'
Also called blackberry merlot rose mallow and blackberry merlot hardy hibiscus
Blackberry Merlot Hibiscus blooms from July through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Blackberry Merlot Hibiscus
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–9. Expect it to reach about 4.5 ft tall and 3.5 ft wide at maturity, in roughly 2 years (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
No toxicity note is on file for Blackberry Merlot Hibiscus. That is not a clearance: check its safety for people and pets before planting.
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Blackberry Merlot Hibiscus
Plant Blackberry Merlot Hibiscus in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 9, spring means March to May and fall means August or September. Once settled, it blooms from July to September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Blackberry Merlot Hibiscus get?
4.5 fttall5 ft 7 inan adult3.5 ftwideSee Blackberry Merlot Hibiscus in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Blackberry Merlot Hibiscus
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Blackberry Merlot Hibiscus about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add Blackberry Merlot Hibiscus to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Blackberry Merlot Hibiscus' height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 15 published sources on October 5, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Walters Gardensthe breeder and introducer; its variety page HIBBMheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Nature Hills Nurseryheight, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- Plant Addictsthe queue's store; Brand: Proven Winnersheight, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- Sooner Plant FarmPark Hill, Oklahomaheight, spread, hardiness zones, sun, bloom months and color, trait tags, soil and diseases
- bowerandbranch.comBower & Branchheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- plants.gertens.comNetPS Plant Finder (the plant database Gertens hosts; entry 34376)height, spread, hardiness zones, sun, water, bloom months and color and soil
- Proven Winnersthe introducer's perennial brandheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- Breck'sheight, hardiness zones, sun, water, bloom months and color and soil
- US plant patent (Google Patents)Walters Gardens Inc, the breeder's own registration, via Google Patentsheight, spread, hardiness zones, water, bloom months and color and diseases
- gardencrossings.comGarden Crossings (grower and retailer, Zeeland, Michigan)height, spread, hardiness zones, water and bloom months and color
- gertens.comGertens (garden center, Inver Grove Heights, Minnesota; its store page)height, spread, hardiness zones, sun and bloom months and color
- plantdetectives.comPlant Detectiveshardiness zones, sun, water, bloom months and color and soil
- NC State ExtensionMuenchhusia moscheutos, formerly Hibiscus moscheutos: a PARENT SPECIES...sun, water, soil, diseases and pests
- saundersbrothers.comSaunders Brothers (wholesale grower, Piney River, Virginia)height, spread and hardiness zones
- ASPCAHibiscus, filed as Hibiscus syriacustoxicity
How the checking works, and what each standard covers, is on the verified plants page.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.