What To Plant: Best Trees For Delaware Landscapes

Delaware offers a surprising variety of planting conditions within a small area: coastal plains, tidal marshes, sandy soils, and more clay-rich soils inland. Choosing the right tree for your site — accounting for soil, drainage, exposure, salt, deer, and space — is essential to long-term success. This article presents practical recommendations for the best trees to plant in Delaware, how to select and plant them, and which species to avoid.

Delaware climate and site considerations

Delaware lies mostly in USDA hardiness zones 6b through 7b. Winters are generally mild on the coast and colder inland; summers are hot and humid. Rainfall is well distributed throughout the year but heavy summer storms can occur. Salt spray and high water tables affect coastal and low-lying sites, while urban heat and pavement influence town planting.
When planning, assess these factors:

Soil texture and drainage: sandy, loamy, or clay; well drained or poorly drained.
Exposure: full sun, partial shade, or deep shade.
Space: mature canopy and root spread, overhead utilities, and proximity to foundations.
Salt and wind: important near the Delaware Bay and Atlantic coast.
Wildlife pressure: deer browse is a major issue in many parts of the state.

How to choose the right tree

Planting the right tree for the right place saves time and money. Follow these concrete steps when selecting a tree:

Evaluate the planting site and write down soil type, sun exposure, and space constraints.
Choose trees with mature sizes that fit the site; avoid planting a large oak under power lines.
Prefer locally native species when possible for wildlife value and lower maintenance.
Buy healthy nursery stock with a clear leader, visible root flare, and no girdling roots.
Avoid species known to be invasive or highly susceptible to pests affecting the region.

Best trees for Delaware, by purpose

Below are recommended trees grouped by landscape purpose. Each entry includes practical notes on size, soil and light preferences, and special considerations.

Shade trees (large, long-lived)

White oak (Quercus alba)
Mature size: 60-80 ft tall, broad canopy.
Site: well-drained loamy soils; tolerates clay if not waterlogged.
Benefits: exceptional wildlife value; long-lived; great fall color.
Notes: slow-growing; plant with ample space and protect young trunks from deer.
Northern red oak (Quercus rubra)
Mature size: 60-75 ft tall.
Site: adaptable to a range of soils; prefers moist, well-drained sites.
Benefits: fast-growing for an oak and excellent fall color.
Notes: slightly more tolerant of compacted soils than white oak.
London planetree / sycamore (Platanus x acerifolia)
Mature size: 60-100 ft tall; urban tolerant.
Site: thrives in urban soils and tolerates pollution and occasional flooding.
Benefits: strong street tree for large spaces.
Notes: messy seed balls can be a nuisance; choose if you have room.

Ornamental and small yard trees

Eastern redbud (Cercis canadensis)
Mature size: 20-30 ft tall; multi-stemmed.
Site: prefers well-drained soil, partial to full sun.
Benefits: stunning early spring bloom, good understory specimen.
Notes: tolerates dry conditions once established.
Serviceberry / juneberry (Amelanchier spp.)
Mature size: 15-25 ft tall.
Site: adaptable, prefers well-drained soil and full sun to part shade.
Benefits: multi-season interest — spring flowers, summer berries, fall color; berries feed birds and are edible.
Notes: choose disease-resistant cultivars for heavy fruiting.
Flowering dogwood (Cornus florida)
Mature size: 20-30 ft tall.
Site: part shade to full sun, prefers well-drained acidic soils.
Benefits: spring blooms and good fall color; supports pollinators.
Notes: select anthracnose-resistant varieties in high-risk areas; avoid hot, compacted urban sites.

Wet-site tolerant trees

River birch (Betula nigra)
Mature size: 40-70 ft tall; multi-stem habit common.
Site: excellent for wet soils, streambanks, and flood-prone yards.
Benefits: attractive peeling bark and good tolerance of wet conditions.
Notes: plant in groups for best effect; susceptible to bronze birch borer if stressed.
Bald cypress (Taxodium distichum)
Mature size: 50-70 ft tall.
Site: tolerates standing water and wet soils; also adapts to drier sites.
Benefits: unique deciduous conifer with autumn color.
Notes: good for pond edges and low-lying landscape areas.
Black gum / tupelo (Nyssa sylvatica)
Mature size: 30-50 ft tall.
Site: prefers moist, acidic soils but tolerates dry soils once established.
Benefits: excellent fall color and high wildlife value.
Notes: slow-growing but long-lived.

Salt-tolerant and coastal trees

Eastern redcedar (Juniperus virginiana)
Mature size: 30-40 ft tall.
Site: thrives in poor, sandy soils and tolerates salt spray.
Benefits: hardy evergreen for windbreaks and coastal buffers.
Notes: can be used in rows for screening; avoid planting too close to foundations due to dense form.
American holly (Ilex opaca)
Mature size: 20-50 ft tall, depending on form.
Site: tolerates coastal conditions and partial shade.
Benefits: evergreen, winter berries (female plants need a male nearby).
Notes: plant both sexes for berries; pick thornless cultivars for family areas.
Black cherry (Prunus serotina)
Mature size: 40-60 ft tall.
Site: adaptable to coastal and inland sites.
Benefits: wildlife food; good canopy tree for larger yards.
Notes: can sucker in some conditions; fruits are attractive to birds.

Urban and street trees (tolerant of compaction, salt, pollution)

Honeylocust (Gleditsia triacanthos var. inermis – thornless varieties)
Mature size: 30-70 ft tall, airy canopy.
Site: tolerates urban heat, compacted soils, and salt.
Benefits: filtered shade that allows grass to grow beneath.
Notes: select thornless, improved cultivars.
Japanese zelkova (Zelkova serrata)
Mature size: 50-80 ft tall.
Site: excellent tolerance to urban conditions and salt spray.
Benefits: vase-shaped canopy similar to English elm without Dutch elm disease risk.
Notes: good alternative to elm in street settings.

Trees to avoid in Delaware landscapes

Planting some species can cause long-term problems either because they are invasive, structurally weak, or highly vulnerable to pests.

Bradford pear and other Pyrus calleryana cultivars
Reason: poor branch structure, prone to splitting; many cultivars are becoming invasive.
Norway maple (Acer platanoides)
Reason: invasive in forests, outcompetes native species and reduces understory diversity.
Ash species (Fraxinus spp.)
Reason: emerald ash borer has devastated ash populations across the region; avoid planting unless the tree will be protected long-term and monitored.

Planting and establishment best practices

Proper planting and follow-up care determine whether a tree becomes a healthy specimen or a maintenance problem.

When to plant:
Best times are early spring before bud break or late fall after leaf drop but before hard freeze.
Avoid planting in hot summer months unless you are prepared to irrigate heavily.
Planting depth and technique:
Dig a hole two to three times wider than the root ball but no deeper than the root flare.
Place the root flare at or slightly above the final soil grade.
Backfill with native soil; avoid deep planting and excessive soil amendments that can create a “pot” effect.
Watering schedule:
Rule of thumb: provide about 10 gallons of water per inch of trunk caliper per week, applied deeply.
For the first year, water deeply 1-2 times per week during dry periods; in years 2-3 taper frequency but keep deep watering during droughts.
Mulching:
Apply 2-4 inches of organic mulch over the root zone, keeping mulch pulled back 2-3 inches from the trunk.
Do not create a mulch volcano around the trunk.
Staking and pruning:
Stake only when necessary for stability and remove stakes after one growing season.
Prune to remove dead, diseased, or crossing branches; establish a central leader on young shade trees where appropriate.
Protection:
Protect trunks from lawn mower and string trimmer damage with guards.
Use deer fencing or repellent systems in high-deer areas, especially for young trees.

Pest and disease awareness

Monitor trees regularly. Common regional concerns include:

Emerald ash borer: avoid planting ash and monitor if you have older ash trees.
Dogwood anthracnose: choose resistant cultivars for Cornus florida and keep trees healthy.
Gypsy moth outbreaks: can defoliate oaks and other hardwoods; maintain tree vigor and remove severely defoliated branches.
Scale, borers, and fungal leaf spots: manage with cultural practices and consult local extension resources for chemical controls when needed.

Practical takeaways for Delaware homeowners

Match species to site: consider soil, drainage, salt exposure, and space before purchasing.
Favor native trees for wildlife benefits and lower maintenance; oaks, redbuds, serviceberries, and black gum are excellent native choices.
Avoid species vulnerable to statewide pests and invasive species that harm natural areas.
Invest in proper planting and early care: correct planting depth, mulching, and watering are far more important than fancy soil amendments.
Think long term: trees are multi-decade investments. Choose species whose mature size and shape fit the space and the role you want the tree to play.

Planting the right tree in the right place will enhance your Delaware landscape for years to come. With careful site assessment, informed species choices, and consistent early care, your trees will provide shade, beauty, wildlife habitat, and value to your property.