Illustration
Blue Prince Holly
Ilex × meserveae 'Blue Prince'
Also called blue prince meserve holly
Blue Prince Holly blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Blue Prince Holly
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–7. Expect it to reach about 10 ft tall and 10 ft wide at maturity, in roughly 5 years (a house reading).
Is Blue Prince Holly toxic to dogs or cats?
- Listed as toxic to dogs and cats by Pet Poison Helpline.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
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 Blue Prince Holly
Plant Blue Prince Holly 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 5, the middle of its hardy zones 4 to 7, spring means April to June and fall means August or September. Once settled, it blooms from April to May.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Blue Prince Holly get?
10 fttall5 ft 7 inan adult10 ftwideSee Blue Prince Holly 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 Blue Prince Holly
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Blue Prince Holly about 10 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Blue Prince Holly 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
Blue Prince Holly's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 11 published sources on October 10, 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.
- Missouri Botanical GardenIlex × meserveae BLUE PRINCE, this clone's own entryheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- RHSRoyal Horticultural Society (Ilex × meserveae [Blue Prince] ('Conablu'...height, spread, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- Plant Addictsthe queue's store pageheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- NC State ExtensionIlex x meserveae, the species; its cultivar list carries a line for 'B...height, hardiness zones, sun, bloom months and color, trait tags, soil, pests and toxicity
- plantdatabase.uconn.eduUniversity of Connecticut Plant Database (Mark H. Brand; Ilex x meserv...height, hardiness zones, sun, water, bloom months and color, soil and diseases
- Purdue ArboretumIlex × meserveae 'Conablu' [sold as Blue Prince®], this clone's own en...height, spread, hardiness zones, sun, bloom months and color, soil and diseases
- nvknurseries.comNVK Nurseries (wholesale grower, Ontario, Canada; Ilex x meserveae 'Bl...height, spread, hardiness zones, sun, water and bloom months and color
- grimmsgardens.comGrimm's Gardens (garden center; Holly Blue Prince)height, spread, hardiness zones, sun and water
- US plant patent (Google Patents)Google Patents' textbloom months and color and trait tags
- woodyplants.nres.uiuc.eduUniversity of Illinois woody plants database (Gary J. Kling; Ilex x me...height, hardiness zones and trait tags
- woodyplants.cals.cornell.eduCornell University Woody Plants Database (Species: Ilex x meserveae, t...pests
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.