Hackberry (Celtis occidentalis) is one of North America’s most underappreciated native trees, a rugged, adaptable, and ecologically generous species that quietly outperforms many more celebrated landscape trees when it comes to wildlife value, cold hardiness, and sheer resilience across a staggering range of conditions. It’s the kind of tree that thrives where others struggle, tolerating drought, compacted urban soils, flooding, wind, heat, and cold with an equanimity that makes it one of the most genuinely tough large trees available to North American gardeners. If you’re looking for a long-lived native shade tree that asks very little, gives a great deal, and supports the local ecosystem with exceptional generosity, hackberry deserves far more attention than it typically receives.

Native across a broad swath of eastern and central North America, from southern Canada south to the Gulf Coast and west to the Rocky Mountain foothills, Celtis occidentalis is as regionally rooted as any tree in the American landscape. It’s hardy in USDA zones 2 through 9, a hardiness range of breathtaking breadth that makes it one of the most cold-tolerant large deciduous trees available. It thrives in full sun to part shade and adapts to an exceptionally wide range of soil types including clay, sand, loam, rocky soils, and highly alkaline soils where many other trees fail to perform. Soil pH tolerance spans from about 6.0 to 8.0, making it one of the more alkali-tolerant native trees. It handles both drought and periodic flooding, tolerates urban pollution, compaction, and salt spray, and grows naturally in bottomlands, upland woodlands, fence rows, and rocky slopes with equal facility. Deer resistance is good on mature trees, though young saplings may be browsed in areas with significant deer pressure.

Hackberry is a large deciduous tree with a broadly rounded to vase-shaped canopy and a distinctive, deeply corky, warty-ridged bark that’s one of its most recognizable features and provides genuine year-round textural interest. It typically grows 40 to 60 feet tall and equally wide in landscape situations, at a moderate rate of 13 to 24 inches per year when young. The leaves are simple, oval to lance-shaped, with an asymmetrical base and a somewhat rough, sandpapery texture on the upper surface, turning a soft, clear yellow in fall. Small, inconspicuous flowers appear in spring as the leaves emerge, and they’re followed by small, round drupes that ripen from red to dark purple in late summer and fall. These berries are the tree’s most ecologically significant feature: they’re relished by an extraordinary array of bird species including cedar waxwings, American robins, northern flickers, yellow-rumped warblers, and many others, and they also provide food for small mammals and are a larval host plant for several butterfly species including the hackberry emperor, tawny emperor, and question mark butterflies. The berries are actually edible for humans too, with a sweet, date-like flavor when fully ripe, though they’re mostly seed with a thin layer of flesh and are more a forager’s curiosity than a culinary staple. Hackberry also produces a fascinating botanical curiosity called witch’s broom, clusters of densely twiggy growth caused by a combination of a mite and a powdery mildew fungus that create dense, broom-like masses in the canopy. These are harmless to the tree’s health and actually provide valuable nesting habitat for certain bird species. In the landscape, hackberry serves beautifully as a large shade tree, a street and urban tree, a specimen tree in a large lawn, a woodland garden component, a windbreak or shelter belt, and a wildlife habitat anchor of exceptional ecological value.

Plant care

Hackberry is one of the most self-sufficient large trees you can plant in the North American landscape. Once established, it requires essentially no ongoing maintenance to remain healthy and perform its ecological and ornamental functions, and its exceptional adaptability to difficult conditions means it succeeds in situations where more demanding trees would struggle or fail. The primary investment is proper siting and establishment care, after which the tree largely takes care of itself.

Watering

Water newly planted hackberry trees deeply and consistently throughout the first two growing seasons to support root establishment, keeping the root zone evenly moist but not waterlogged. Deep, infrequent watering encourages the extensive root system to develop downward and outward, building the remarkable drought resilience that makes mature hackberry trees so self-sufficient. After the first year or two, established hackberry is genuinely drought tolerant and rarely needs supplemental irrigation in typical climate conditions. It handles both extended dry periods and periodic flooding with equal resilience, reflecting its natural occurrence in both bottomland and upland habitats across its wide native range. In the hottest and driest parts of its range, a deep watering during extreme summer drought benefits younger trees, but mature specimens in average conditions typically manage entirely on natural rainfall. Overwatering is rarely a concern with hackberry given its natural adaptability, but planting in sites with persistently standing water should still be avoided.

Fertilizing

Hackberry growing in typical garden or landscape soils needs no supplemental fertilization, and routine feeding is neither necessary nor particularly beneficial for this adaptable native tree. In very poor, compacted urban soils where the tree is establishing slowly or showing signs of nutrient stress such as pale, undersized foliage, a light application of a balanced slow-release fertilizer in early spring can support the establishment process. Once the tree is growing vigorously and well established, which typically happens within two to three years of planting in most conditions, fertilization becomes unnecessary. If you’re fertilizing a lawn area around the tree, the tree will absorb adequate nutrition from that program without any separate feeding. Avoid fertilizing in late summer or fall, as this can stimulate tender new growth that won’t harden properly before cold weather arrives.

Mulching

A wide mulch ring around a newly planted hackberry is one of the most beneficial investments you can make for the tree’s establishment and long-term health. Apply a 3- to 4-inch layer of shredded bark or wood chips in as wide a ring as practical, ideally extending to or beyond the drip line, and keep the mulch pulled back 4 to 6 inches from the trunk to prevent moisture accumulation against the bark. Wide mulch rings that protect the trunk from string trimmer and mower injury are particularly valuable for young trees, as mechanical damage at the base is one of the most common causes of decline in landscape trees. Mulch conserves moisture, moderates soil temperature, suppresses competing turf and weeds, and gradually improves soil organic matter and structure as it decomposes. In established trees, naturally accumulating leaf litter beneath the canopy provides a self-replenishing mulch layer that requires no supplementation. For street trees and urban plantings, maintaining a mulched area as large as the site allows significantly improves the tree’s performance in compacted, nutrient-depleted urban soils.

Pruning

Hackberry has a strong natural structure and develops a well-formed canopy without extensive corrective pruning in most situations. Young trees benefit from selective structural pruning in their first several years to establish a single, dominant central leader and remove any competing leaders, crossing branches, or poorly angled scaffolding branches while the wood is small and the wounds are minor. Late winter, while the tree is fully dormant and before new growth begins, is the best time for structural pruning, when the branch architecture is fully visible and the tree is preparing to push the new growth that will heal pruning wounds efficiently. Remove dead, damaged, or diseased branches as they appear at any time of year. Avoid pruning in spring when the sap is actively flowing, as this can increase susceptibility to certain fungal issues. On mature trees, routine pruning needs are minimal; periodic removal of dead wood and any branches that develop structural problems or clearance issues is typically all that’s required. Never top a hackberry or make unnecessarily large cuts on mature wood, as these create long-term structural weakness and decay.

Winter care

Hackberry is cold-hardy through zone 2 and requires essentially no winter preparation across its entire hardiness range, which is one of the most compelling practical arguments for planting it in cold-climate gardens. Established trees handle winter dormancy without any special attention, and the deeply textured, corky bark and twisting branch structure create a genuinely distinctive winter silhouette that contributes ornamental interest to the landscape even in full dormancy. The witch’s broom clusters visible in the bare canopy are a curious and charming winter feature that draws attention and questions from observant visitors. Young trees in their first or second winter benefit from a generous mulch layer over the root zone to insulate establishing roots from severe freeze-thaw cycles, particularly in the coldest zones. No wrapping, covering, or other winter protection is needed for trees in any part of the hardiness range.

Pests and diseases

Hackberry’s most commonly noted “pest” problem is actually a benign ecological phenomenon rather than a true health threat. Witch’s broom, the dense, twiggy growth clusters caused by a combination of the hackberry bud gall mite (Eriophyes celtis) and the powdery mildew fungus Sphaerotheca phytophila, is ubiquitous on hackberry trees and looks more alarming than it is. It causes no significant harm to a healthy tree’s overall vigor or longevity, and the dense twig clusters actually provide valuable nesting sites for birds. No treatment is necessary or recommended. Hackberry nipple gall, caused by psyllid insects that create small nipple-shaped bumps on the leaves, is another nearly universal and essentially harmless condition; affected leaves may look odd but the tree’s health is not meaningfully impacted. Hackberry woolly aphid can cause some leaf distortion and curling but is rarely severe enough to warrant treatment. More serious concerns include Botryosphaeria canker, which can cause stem dieback, particularly on stressed trees; maintaining tree vigor through appropriate siting and establishment care is the most effective prevention. Root rot from Phytophthora can occur in consistently waterlogged soils. Overall, hackberry is remarkably free of the serious pest and disease problems that affect many other large landscape trees, and a healthy, well-sited specimen is essentially self-maintaining from a pest management standpoint.

Wildlife value

Hackberry’s ecological generosity is one of its defining characteristics and the single most compelling reason to include it in any landscape where supporting native wildlife is a priority. The small berries ripen in late summer and fall and persist into winter, providing a critical food source across an exceptionally long season for dozens of bird species. Cedar waxwings, American robins, eastern bluebirds, yellow-rumped warblers, northern mockingbirds, and many others feed heavily on the fruit. The tree is the exclusive or primary larval host plant for three butterfly species, the hackberry emperor (Asterocampa celtis), the tawny emperor (Asterocampa clyton), and the question mark (Polygonia interrogationis), making it irreplaceable from the perspective of supporting those butterfly populations. Numerous moth species also use it as a larval host. The dense, twiggy witch’s broom clusters provide nesting habitat for small birds, and the tree’s large size and longevity make it a provider of the cavity nesting habitat that so many bird species depend on as it ages. From caterpillars to butterflies to fruit-eating birds to cavity nesters, hackberry supports a remarkable food web that few other commonly planted landscape trees can match.

Landscape design

Hackberry is most effective as a large shade tree with room to develop its full, broadly rounded canopy, and its considerable mature size means it’s best suited to large residential lots, parks, open meadows, and acreages where scale is appropriate. As a single specimen in a large lawn, its corky, deeply furrowed bark is ornamentally distinctive and becomes increasingly impressive with age, rivaling the winter interest of any large native tree. The broadly spreading canopy provides generous shade that makes it a natural choice for positioning on the south or west side of a house to reduce summer cooling loads, and because it’s deciduous, it allows winter sun through during the cold months. Along a property boundary, a row or informal grouping of hackberry trees creates a windbreak, wildlife corridor, and visual screen of exceptional ecological value. In a naturalistic or woodland garden planting, it fits seamlessly into the native plant community and provides a canopy layer beneath which native woodland shrubs, wildflowers, and ferns can be established to create a multilayered habitat planting. On challenging urban sites with compacted soil, pollution, and limited water, it’s one of the most reliable large trees available for street and parkway use, tolerating the indignities of the urban environment with a resilience that few other large trees can match. Companion trees that suit hackberry’s ecological and aesthetic character include bur oak, shagbark hickory, black gum, and American elm, all of which share its native range and provide a complementary mix of form, texture, and wildlife value. Beneath the canopy, native wildflowers including wild columbine, Virginia bluebells, and woodland phlox, along with native ferns and native shrubs like serviceberry and native viburnums, create a cohesive, ecologically functional planting that celebrates the native landscape.

Frequently asked questions

Why don’t more people plant hackberry? It’s largely a matter of unfamiliarity and the lack of a single spectacular ornamental moment that makes trees like flowering cherries and redbuds so immediately appealing. Hackberry doesn’t dazzle in any single season but contributes reliably and generously across all four seasons and over many decades, and its ecological value and adaptability are exceptional. Gardeners who prioritize native plants, wildlife habitat, and long-term resilience tend to appreciate it enormously once they discover it, and it’s gradually gaining the recognition it deserves as interest in native plant landscaping grows.

Is hackberry a good street tree? Yes, it’s one of the best large native trees for street and urban use. Its tolerance of compacted soils, drought, pollution, road salt, and the temperature extremes of urban heat islands makes it genuinely suited to conditions that defeat most other large trees. Its moderate growth rate, strong wood, and reliable root behavior make it a practical and long-lived choice for parkway and street tree situations.

Are hackberry berries edible? Yes, and they’re actually quite pleasant when fully ripe in fall, with a sweet, mild flavor sometimes compared to dates or raisins. However, they’re mostly seed with a thin layer of flesh and don’t lend themselves to traditional culinary use. They’re a genuine forager’s fruit and are perfectly safe to eat, but most gardeners grow the tree for shade and wildlife value rather than for the harvest.

What causes the strange broom-like growths in hackberry trees? The witch’s broom growths are caused by a combination of the hackberry bud gall mite and a powdery mildew fungus acting together to disrupt normal bud development and create dense clusters of short, proliferating twigs. They’re essentially universal on hackberry trees throughout its range and are completely harmless to the tree’s health. They’re also ecologically useful, providing nesting habitat for birds, and they’re one of the features that give mature hackberry trees their distinctive, characterful appearance.

How large does hackberry get? In landscape situations, expect 40 to 60 feet tall and equally wide at maturity over several decades. In ideal conditions, particularly in bottomland soils with ample moisture, it can grow larger. The broadly spreading canopy creates generous shade and an impressive presence in a large landscape, but the mature size means it needs considerable horizontal and vertical space and should be sited accordingly, well away from structures, power lines, and other obstacles.

How does hackberry compare to American elm as a shade tree? The two are sometimes compared because they share similar native ranges, similar vase-shaped to rounded canopy forms, and similar adaptability to tough urban conditions. American elm has a more graceful, arching form and longer historical association with American streets and landscapes, but its vulnerability to Dutch elm disease makes it a riskier long-term investment than disease-resistant hackberry. For gardeners who want a large, tough, ecologically valuable native shade tree with reliable longevity, hackberry is arguably the more practical choice.

Does hackberry have good fall color? Fall color is modest rather than spectacular, a clear soft yellow that’s pleasant and warm but doesn’t rival the brilliant reds of maples or the gold of ginkgos. It’s a tree grown primarily for its adaptability, ecological value, shade, and textural bark interest rather than for fall color, and gardeners who appreciate it most tend to value those qualities over a brief autumn spectacle. Pairing it with understory trees and shrubs that provide stronger fall color rounds out the seasonal interest of a hackberry-anchored planting.

What butterflies use hackberry as a host plant? Three butterfly species are closely associated with hackberry as their primary larval host: the hackberry emperor, the tawny emperor, and the question mark butterfly. These species lay their eggs specifically on hackberry foliage, and the caterpillars feed on the leaves. Planting hackberry is one of the most direct and impactful things you can do to support these butterfly species in your local area, and in regions where hackberry is native, a mature tree will reliably host these butterflies every summer.

Can I plant hackberry in a wet area? Yes, hackberry’s natural occurrence in bottomland habitats means it handles periodic flooding and consistently moist soils much better than many large trees. It’s not a true wetland tree in the way that bald cypress or swamp white oak are, but it tolerates temporary inundation and high water tables that would stress or kill less adaptable species. For sites that are reliably moist but not permanently flooded, it’s an excellent and underused choice.