Illustration
Adirondack
Malus 'Adirondack'
Adirondack blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Adirondack
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 16 ft tall and 10 ft wide at maturity, in roughly 10 years (a house reading).
What was checked
Fifteen fields were checked against named botanical sources, each recorded beside the sources that carried it, with every unsettled point written down and decided: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, soil, diseases, pests, toxicity, the plant's own names, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. 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 Adirondack
Plant Adirondack 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 8, spring means March to May 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 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 Adirondack get?
16 fttall5 ft 7 inan adult10 ftwideSee Adirondack 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 Adirondack
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Adirondack 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 Adirondack 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
Adirondack's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 9 published sources on August 20, 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.
- kb.jniplants.comJohnson's Nursery Knowledgebase (Menomonee Falls, WI)height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- extension.colostate.eduColorado State University Extension, Flowering Crabapple Trees fact sh...height, spread, sun, water, bloom months and color, diseases, pests and toxicity
- Purdue ArboretumPurdue University Arboretum Explorerheight, spread, hardiness zones, sun, bloom months and color, trait tags, soil and diseases
- plants.rostlandscaping.comSuperior Garden Center / Rost Landscaping plant database (NetPS)height, hardiness zones, sun, water, bloom months and color and soil
- The Morton Arboretumheight, spread, trait tags, diseases and pests
- bowerandbranch.comBower & Branch (nursery)height, hardiness zones and soil
- NC State Extensiongenus Malus pagesun and soil
- ASPCAAnimal Poison Controltoxicity
- hoytarboretum.gardenexplorer.orgHoyt Arboretum Garden Explorer (Portland, OR)hardiness zones
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Adirondack
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses: the seeds, stems and wilting leaves hold cyanogenic glycosides. The ripe flesh is not the hazard; the seeds and wilting foliage are. per ASPCA
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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.