Hackberry Tree

An extremely tough and adaptable shade tree that thrives where other trees fail, tolerating drought, wind, poor soil, and urban pollution. Hackberries produce small sweet berries in autumn that are eaten by dozens of bird species, making them excellent wildlife trees. The bark develops distinctive corky warts that give it a unique character. They are increasingly recommended as elm replacements due to their similar form, adaptability, and disease resistance.

Hackberry seeds require cold stratification for 60 to 90 days to break dormancy. Collect ripe fruits in fall, clean the flesh from the seeds, and place them in moist sand in the refrigerator over winter. Sow stratified seeds outdoors in early spring, covering them with a quarter inch of soil. Germination takes two to four weeks. Seedlings grow rapidly in the first few years. Named cultivars must be propagated by grafting onto seedling rootstock, as they do not come true from seed.

The Season Plate

Your Hackberry Tree Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Hackberry Tree Mar – Apr, Oct – Nov, pick Sep – Oct. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – Apr, Oct – Nov

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Mar 12

≈ 3650 days from sowing · 15 years per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Hackberry Tree reminders watering, feeding and pruning, timed to your dates

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Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

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Get my Hackberry Tree datesSaved to your free garden plan · no card needed

Select a planting site with full sun to partial shade and deep, well-drained soil. Hackberries are remarkably adaptable and will grow in clay, sand, limestone, and even compacted urban soil, but they perform best in fertile loam with a pH between 6.0 and 8.0. Plant balled-and-burlapped or container-grown trees in early spring or fall, digging a hole two to three times the width of the root ball but no deeper than the root flare.

Water newly planted trees deeply once a week during the first two growing seasons. Once established, hackberries are exceptionally drought-tolerant and rarely need supplemental irrigation except during prolonged dry spells. Apply a 3-inch layer of organic mulch around the base, keeping it several inches away from the trunk to prevent bark decay.

Prune in late winter to remove dead, crossing, or rubbing branches and to establish a strong central leader when the tree is young. Hackberries naturally develop an attractive vase shape with minimal intervention. Avoid heavy pruning of mature trees, as they compartmentalize wounds slowly. Fertilize young trees with a balanced slow-release fertilizer in early spring until they are well established.

Hackberries cast moderate shade that allows many understory plants to thrive. Pair with shade-tolerant perennials like hostas, ferns, and astilbe beneath the canopy. Daffodils and other spring bulbs naturalize well under hackberries, blooming before the tree leafs out. Native wildflowers such as wild geranium and Solomon seal complement the hackberry in naturalistic plantings. Avoid planting shallow-rooted shrubs directly over the root zone where competition for moisture is intense.

The Society Table

Daffodil belongs beside it. Walnut Tree doesn't.

Old growers' knowledge, checked against Hackberry Tree's real companion table below — test any plant you're growing.

Grows well in the company of · 1

Daffodil

Keep apart · 1

Walnut Tree

Plant Hackberry Tree with good neighboursThe planner flags conflicts before they're in the ground

Related growing guides

Flowers

Daffodil

A good companion for Hackberry Tree

Trees

Maple

View growing guide

Trees

Birch

View growing guide

Trees

Oak

View growing guide

Hackberries thrive in a wide range of soils from heavy clay to sandy loam, tolerating pH levels from 5.5 to 8.5. They are one of the few shade trees that perform well in alkaline and limestone soils. Apply a balanced 10-10-10 fertilizer in early spring for the first five years after planting at a rate of 2 pounds per inch of trunk diameter. Mature trees rarely need fertilization unless growing in extremely poor soil. Avoid high-nitrogen fertilizers that promote soft, disease-susceptible growth.

Ideal Temperature

Hardiness Zone Compatibility

Hackberry fruits ripen in September and October, turning dark purple when mature. The small drupes have a thin sweet flesh surrounding a hard seed and can be gathered by shaking branches over a tarp. Birds compete vigorously for the fruit, so harvest promptly when ripe. The berries can be eaten fresh, dried, or ground into a paste that was historically used by Native Americans as a food source mixed with fat and corn.

Storage & Preservation

Fresh hackberries can be refrigerated for up to two weeks. For longer storage, dry the fruits in a single layer on screens in a warm, well-ventilated area until completely desiccated, which takes about one to two weeks. Dried hackberries store in airtight containers for up to a year. The dried fruits can be ground into a powder and used as a flavoring or nutrient supplement. Frozen berries maintain quality for six months.

Hackberry Nipple Gall

Pest

Small nipple-shaped projections on the undersides of leaves caused by psyllid insects. Leaves may appear bumpy and distorted but the tree is not seriously harmed.

Prevention Maintain tree vigor through proper watering and fertilization. Rake and destroy fallen leaves in autumn to reduce overwintering psyllid populations.

Fix: Chemical control is rarely warranted as the galls are cosmetic. Systemic insecticides applied in early spring can reduce populations if the infestation is severe.

Witches Broom

Disease

Dense clusters of stunted, twiggy growth at branch tips caused by a combination of the hackberry bud mite and a powdery mildew fungus. Creates unsightly tufts that persist through winter.

Prevention Select resistant cultivars such as Prairie Pride or Chicagoland. Maintain overall tree health with adequate watering and nutrition.

Fix: Prune out witches broom clusters in late winter. No chemical treatment effectively eliminates the condition once established, but vigorous trees tolerate it well.

Hackberry Engraver Beetle

Pest

Small bore holes in bark with fine sawdust frass. Branches may die back and bark may slough off on heavily infested limbs.

Prevention Keep trees healthy and well-watered, as beetles primarily attack stressed trees. Remove dead or dying branches promptly.

Fix: Prune and destroy infested branches. Insecticide sprays are generally not effective against bark beetles. Focus on improving overall tree health to resist future attacks.

Troubleshooting Common Problems

The most frequent complaint about hackberries is the cosmetic nipple gall caused by psyllid insects, which disfigures leaves but does not harm the tree. Witches broom formations can make the tree look unkempt in winter. The abundant berry crop attracts birds, which can create mess on cars and walkways below the canopy. Surface roots may lift sidewalks in tight planting strips. Some gardeners find the tree too common or plain compared to showier shade trees, but its unmatched toughness compensates.

Growing Tips

1. Select a planting site with full sun to partial shade and well-drained soil, though hackberry tolerates a remarkably wide range of conditions including clay, sand, limestone, and slightly alkaline soils with pH up to 8.0. Avoid only permanently waterlogged sites where root rot becomes a risk.
2. Plant hackberry trees at least 10 meters from foundations, septic systems, and underground utilities, as the extensive root system can spread well beyond the drip line. Allow a mature canopy spread of 10-12 meters when planning spacing in the landscape.
3. Water young trees deeply once per week during their first three growing seasons to establish a robust root system. Once established, hackberry is remarkably drought-tolerant and rarely needs supplemental irrigation even during extended dry periods in summer.
4. Prune to a single central leader when the tree is young to develop strong branch architecture. Remove any competing co-dominant leaders early, as narrow crotch angles in hackberry are prone to splitting under ice and wind loads as the tree matures.
5. Accept hackberry nipple gall as a cosmetic issue that does not threaten tree health. The small raised bumps on leaves caused by psyllid insects are virtually universal on hackberry and chemical treatment is neither necessary nor recommended for established trees.
6. Harvest ripe berries when they turn dark purple-brown by placing a clean tarp beneath the tree and shaking branches or by hand-picking individual clusters. Berries can be eaten fresh, dried whole for storage, or ground into meal using a grain mill or heavy-duty blender.
7. Dry hackberry fruits in a food dehydrator at 57°C (135°F) for 8-12 hours or spread them on screens in a warm, dry location with good air circulation for several days. Fully dried hackberries store for over a year in airtight containers at room temperature.
8. Allow volunteer seedlings to establish in desired locations rather than fighting natural regeneration, as hackberry self-sows readily and seedlings transplant easily when small. Unwanted seedlings should be removed when young before the taproot becomes established.
9. Mulch young trees generously with wood chips or shredded bark in a 7-10 cm layer extending to the drip line to suppress weeds, retain soil moisture, and moderate soil temperature. Avoid piling mulch against the trunk, which promotes bark decay and rodent damage.
10. Consider planting hackberry as a replacement for American elms lost to Dutch elm disease, as hackberry provides a similar vase-shaped canopy, thrives in the same growing conditions, and is immune to the fungal pathogen that devastated the elm population across North America.