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Callery Pear
The familiar early-blooming 'Bradford pear' turned out to be a fast-spreading, foul-smelling, storm-prone invasive that reverts to thorny wild thickets - now banned or being phased out in several states. Never plant it.
Safety notes Callery pear is not grown for food - its fruits are tiny and hard. The real hazards are practical: escaped wild seedlings form dense thickets armed with long, stout thorns that can puncture skin, tires, and equipment, so wear heavy gloves and eye protection when clearing them. The trees are also structurally weak, splitting apart in wind, ice, and storms, so mature specimens are a limb-and-trunk failure hazard, and the spring flowers smell strongly unpleasant. Do not plant it.
Overview
Callery pear (Pyrus calleryana) - best known by the cultivar name 'Bradford' pear - was for decades one of America's most-planted ornamental street trees, prized for its tidy teardrop shape and a cloud of white bloom in very early spring. It has since become a textbook cautionary tale. The cultivars sold as sterile turned out to cross-pollinate with one another, producing fertile fruit that birds spread far and wide, and the resulting wild seedlings have exploded across the eastern and central US, forming dense, thorny thickets that crowd out natives along roadsides, fields, and forest edges.
On top of the invasion, the tree has two other well-earned strikes against it: its flowers carry a strong, unpleasant odor, and its crowded, weakly attached branches make it notoriously prone to splitting apart in wind and ice, so even as a yard tree it's short-lived and hazardous. Several states have moved to ban or phase it out, some with buy-back programs to swap it for natives. This entry is here to help you recognize and control Callery pear - and to steer you to far better trees to plant instead.
Quick facts
For identification. Not a growing guide.
- Height
- 30 ftRange: 20–50 ft
- Spread
- 25 ftRange: 15–40 ft
- Cold
- Takes hard frostdamaged below -20°F
- Heat
- Struggles above 105°F
- Life cycle
- Perennial, lives about 25 years
- Self-sows
- Yes. Never let it set seed.
- Habitat
- Full sun · Part sun, well-drained soil
Through the year
A field guide through time
Explore the stages to recognize this plant throughout its life.
Stage 1 of 3 · The recurring year
Early-spring white bloom (identify & control)
Mar to Apr, every year
Know this stage
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Recognize it: early white bloom with a foul smell
Callery pear is one of the first trees to bloom, covering itself in dense clusters of white five-petaled flowers in very early spring - often before most natives leaf out. The flowers carry a distinctive strong, unpleasant odor (often likened to rotting fish). A neat teardrop-shaped tree smothered in early white bloom along roadsides and edges, with a bad smell up close, is very likely Callery pear.
-
Do not plant it; report and remove escapees
The single best control is prevention: never plant Callery pear or its cultivars (Bradford, Cleveland Select, and others - they all cross-pollinate). Some states run 'bounty' or buy-back programs to replace them. Where it has escaped, plan to remove wild seedlings and thickets before they mature and fruit.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Hazards
Cross-Pollination & Bird-Spread SeedSeverity High DisordernowSeason: Mar, Apr, Sep, Oct, NovHeavy fruit set on trees planted near other cultivars, wild seedlings far from any planting, and vigorous resprouting after cutting.
Heavy fruit set on trees planted near other cultivars, wild seedlings far from any planting, and vigorous resprouting after cutting.
Remove and cut-stump-treat fruiting trees, pull seedlings, and persist for several seasons against resprouts and new germination.
Don't plant any cultivar; remove fruiting trees; don't rely on 'sterile' claims - mixed cultivars set fertile seed.
Why the 'sterile' trees invade: different Callery cultivars cross-pollinate to set abundant fertile fruit, birds scatter the seed across the landscape, and cut or damaged trees resprout aggressively, so the population expands from many sources at once.
Thorny Invasive Thickets (ecological harm)Severity High DisordernowSeason: Mar–OctStands of early-white-blooming trees and thorny saplings colonizing roadsides, fields, and edges, spreading outward from plantings and each other.
Stands of early-white-blooming trees and thorny saplings colonizing roadsides, fields, and edges, spreading outward from plantings and each other.
Cut and immediately treat stumps with herbicide (they resprout otherwise), pull seedlings, follow up on resprouts, and replant with natives.
Never plant it or its cultivars; remove fruiting trees to cut off the seed supply; clear seedlings while small.
The core hazard is ecological: escaped Callery pears form dense, thorny thickets that crowd out native grasses, wildflowers, shrubs, and tree seedlings along roadsides, old fields, and forest edges, converting diverse habitat into low-value monoculture.
Weak Structure & Storm FailureSeverity Medium DisordernowSeason: year-roundDense narrow-angled branching, included bark in crotches, and splitting or limb failure on maturing trees, especially after ice or wind.
Dense narrow-angled branching, included bark in crotches, and splitting or limb failure on maturing trees, especially after ice or wind.
Remove hazardous or failing trees (and replace with structurally sound natives); pruning cannot fix the built-in weak architecture.
Don't plant them; remove aging specimens before they fail near homes, cars, or walkways.
A direct property and safety hazard: Callery pears grow many branches crowded at one point with narrow, bark-included crotches, giving them almost no structural strength, so mature trees routinely split apart and drop large limbs in wind, ice, and storms.
Grower tips
Notes from growers, tagged with the zone they grow in. A person reads every post before it appears.
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