Illustration
Alexandrina Magnolia
Magnolia × soulangeana 'Alexandrina'
Alexandrina Magnolia blooms from March through April.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Alexandrina Magnolia
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 5–9. Expect it to reach about 20 ft tall and 16 ft wide at maturity, in roughly 12 years (checked).
No toxicity note is on file for Alexandrina Magnolia. That is not a clearance: check its safety for people and pets before planting.
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 Alexandrina Magnolia
Plant Alexandrina Magnolia 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 7, the middle of its hardy zones 5 to 9, spring means March to May and fall means September or October. Once settled, it blooms from March to April.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 7, the middle of this plant's hardy range, start with zone 7 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Alexandrina Magnolia get?
20 fttall5 ft 7 inan adult16 ftwideSee Alexandrina Magnolia 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 Alexandrina Magnolia
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Alexandrina Magnolia about 16 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 Alexandrina Magnolia 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
Alexandrina Magnolia's height, spread, hardiness zones, sun, water, bloom months and color, years to mature size, trait tags, soil, diseases, pests and toxicity were checked against 18 published sources on August 23, 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.
- University of Florida IFASUF/IFAS EDIS, FPS-367 (Gilman, Klein and Hansen)height, spread, hardiness zones, sun, water, bloom months and color, years to mature size, trait tags, soil, diseases and pests
- The Morton Arboretumheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and diseases
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, bloom months and color, soil, diseases, pests and toxicity
- conservationgardenpark.jvwcd.govConservation Garden Park, Jordan Valley Water Conservancy District (Ut...height, spread, hardiness zones, sun, water, bloom months and color, soil and pests
- vdberk.comVan den Berk Nurseriesheight, spread, hardiness zones, bloom months and color, soil and toxicity
- Chicago Botanic GardenPlant Finderhardiness zones, sun, water and bloom months and color
- devilmountainnursery.comDevil Mountain Wholesale Nurseryheight, spread, hardiness zones, sun and water
- Oregon State UniversityLandscape Plantshardiness zones, sun, bloom months and color and years to mature size
- woodyplants.cals.cornell.eduCornell University Woody Plants Databasehardiness zones, sun, water, soil and diseases
- plantmegreen.comPlant Me Greenspread, hardiness zones, soil and diseases
- app.lsuagcenter.comLSU AgCenter, The Trials at Hammondheight, hardiness zones and soil
- boethingtreeland.comBoething Treeland Farmsheight, water and pests
- myperfectplants.comPerfect Plants Nurseryheight, hardiness zones and years to mature size
- treesandshrubsonline.orgTrees and Shrubs Online (International Dendrology Society)hardiness zones and bloom months and color
- gardens.duke.eduDuke Gardens (Sarah P. Duke Gardens, Duke University)bloom months and color
- plants.tagawagardens.comTagawa Gardens (syndicated plant database)years to mature size and soil
- victorynursery.usVictory Nurseryheight and spread
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.