Black Gum

Nyssa sylvatica

A spectacular native shade tree that delivers the earliest and most brilliant fall color display, with leaves turning intense scarlet, orange, and purple weeks before other trees. This slow-growing, long-lived beauty adapts to various conditions while providing valuable wildlife habitat. An excellent choice for gardeners seeking four-season interest and low maintenance.

Sun

Full sun

☀️

Zones

4–9

USDA hardiness

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Height

40-70 feet

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Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Transplant

Showing dates for Black Gum in USDA Zone 7

All Zone 7 shade-tree →

Zone Map

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Black Gum · Zones 4–9

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing20-30 feet

SoilAdaptable, prefers slightly acidic, well-drained soil

pH4.5-6.5

WaterHigh — consistent moisture needed

SeasonSpring and Summer

FlavorN/A

ColorBrilliant red, orange, purple fall foliage

SizeMedium to large shade tree

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 4	—	June – July	—	—
Zone 5	—	May – July	—	—
Zone 6	—	May – July	—	—
Zone 7	—	May – June	—	—
Zone 8	—	April – June	—	—
Zone 9	—	March – May	—	—

Complete Growing Guide

Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, Loam (Silt), Sand. Soil pH: Acid (<6.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist, Occasional Flooding, Occasionally Dry, Occasionally Wet. Height: 40 ft. 0 in. - 70 ft. 0 in.. Spread: 20 ft. 8 in. - 35 ft. 6 in.. Spacing: 12-24 feet, 24-60 feet. Growth rate: Medium. Maintenance: Low. Propagation: Layering, Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Female trees only. From late summer to fall, the tree produces green drupes that ripen to bluish-black, round to oval, 3/8 to 1/2-inch long, and clustered on stalks up to 1 1/2 inches long. Thin, bitter-smelling flesh surrounds the small, ribbed seeds. The fruits are edible but sour. Birds and small mammals enjoy the drupes.

Color: Black, Blue. Type: Drupe. Length: < 1 inch. Width: < 1 inch.

Garden value: Edible

Harvest time: Fall, Summer

Edibility: Fruit can be eaten raw or cooked. Produces a thin sharply acid pulp that is pleasant to roll in the mouth as a masticatory, it is also used in preserves. The honey bees produce from the flowers of this tree is highly prized.

Storage & Preservation

As an ornamental tree, Black Gum requires no post-harvest preservation in the conventional sense. If you've cut branches for fall arrangements, condition them immediately: remove lower leaves, recut stems at a 45-degree angle, and place in cool water (60–65°F) with floral preservative. Branches will hold color for 2–3 weeks in a cool room away from direct heat and ripening fruit. For longer preservation, hang-dry individual branches in a cool, dark, well-ventilated space (60–70°F, low humidity). Dried branches retain color reasonably well for 1–2 months and work well in dried arrangements. Do not attempt to freeze or can foliage—this damages cell structure and aesthetic value. Store any fallen leaves in a cool, dry place if you're collecting them for seasonal décor or crafts; they'll remain vibrant for weeks but will eventually brown and crisp naturally.

History & Origin

Origin: Southern Ontario, Central and Eastern United States, and Mexico

Advantages

+Attracts: Bees, Frogs, Pollinators, Reptiles, Small Mammals, Songbirds, Specialized Bees
+Edible: Fruit can be eaten raw or cooked. Produces a thin sharply acid pulp that is pleasant to roll in the mouth as a masticatory, it is also used in preserves. The honey bees produce from the flowers of this tree is highly prized.
+Low maintenance

Companion Plants

The shade-tolerant natives in this list — Wild Ginger (Asarum canadense), Trillium, and Wild Columbine (Aquilegia canadensis) — work well under Black Gum because they've co-evolved in the same eastern woodland understory. They're adapted to dappled light and the acidic leaf litter (pH 4.5–6.5) that Black Gum produces as it matures. Ferns, Hostas, Astilbe, and Coral Bells fill the same niche if you want something a little more garden-tidy; all of them tolerate moderate to deep shade under a 40–70-foot canopy and won't compete aggressively with the tree's lateral roots. Winterberry Holly (Ilex verticillata) is a particularly good pairing — it shares the same preference for consistently moist, acidic soil, and the two together pull in birds from October through February when other food sources are sparse.

The harmful companions are worth understanding. Grass lawn is the most common mistake people make: turf planted up to the trunk competes directly for moisture, and mowing equipment causes repeated bark wounds that invite wood decay. Keep a mulched bed at minimum 6 feet from the trunk. Walnut trees (Juglans nigra) excrete juglone from their roots — a compound that suppresses a wide range of plants, and Black Gum shows enough sensitivity that you don't want the two sharing close root zones. Roses are simply a poor practical fit: they want full sun, near-neutral soil pH, and a fertilization schedule that has nothing in common with what Black Gum needs.

Plant Together

Wild Ginger

Thrives in similar acidic soil conditions and provides excellent groundcover under the canopy

Ferns

Tolerates deep shade and acidic soil, creates natural woodland understory

Astilbe

Flourishes in partial shade with consistent moisture from tree's canopy protection

Hostas

Benefits from filtered light and moist conditions provided by the tree's shade

Coral Bells

Adapts well to acidic soil and partial shade conditions under the canopy

Wild Columbine

Native woodland plant that thrives in similar acidic, well-draining soil

Trillium

Spring ephemeral that complements the tree's seasonal cycle and soil preferences

Winterberry Holly

Both prefer acidic, moist soil and provide wildlife habitat in different seasons

Keep Apart

Grass Lawn

Competes for water and nutrients, requires different soil pH and light conditions

Walnut Trees

Produces juglone which is toxic to many plants including Black Gum

Roses

Requires full sun and alkaline soil, opposite of Black Gum's acidic shade conditions

Pests & Disease Resistance

Resistance

Excellent disease and pest resistance

Common Pests

Very few pest problems, occasionally scale

Diseases

Generally disease-free, very hardy

Troubleshooting Black Gum

What you'll see, why it happens, and what to do about it.

Leaves turning prematurely red or dropping in midsummer, not in fall

Likely Causes

Drought stress — Black Gum needs consistent moisture and will drop leaves early if the soil dries out for extended periods
Transplant shock in young trees planted after June, when root systems haven't established

What to Do

1.Deep-water at the drip line once or twice a week during dry stretches — aim for the top 12 inches of soil staying consistently moist, not soggy
2.Mulch 3-4 inches deep with wood chips out to the drip line to hold moisture and regulate soil temperature
3.If the tree was transplanted this season, hold off on fertilizer and focus entirely on water; let it settle for a full year before expecting normal growth

Sticky residue on leaves or branches, sometimes with a sooty black coating

Likely Causes

Scale insects (soft scale or armored scale) — the sticky substance is honeydew excreted by feeding scale; sooty mold (Capnodium spp.) grows on top of it
Scale infestations are more common on stressed or newly transplanted trees

What to Do

1.In late winter before bud break, apply horticultural oil spray to the bark and branches — this smothers overwintering scale
2.For active infestations during the growing season, spot-treat with insecticidal soap on a cool morning, coating branch undersides thoroughly
3.Keep up with watering; healthy Black Gums rarely develop serious scale problems in the first place

Tree failing to establish — little to no new growth two full growing seasons after planting

Likely Causes

Soil pH too high — Black Gum is strongly acid-preferring (pH 4.5–6.5) and will stall in neutral or alkaline soils where iron and manganese become unavailable
Root disturbance during transplant — Nyssa sylvatica has a deep taproot and resents having it cut or bent to fit a hole

What to Do

1.Test your soil pH before planting; if it's above 6.5, work elemental sulfur into the planting area the season before
2.Buy the smallest container-grown or balled-and-burlapped specimen you can find — a 6-foot tree will often outpace a 12-foot tree within 5 years because the root-to-shoot ratio is better
3.Dig the planting hole 2–3 times wider than the rootball but no deeper; spread the roots outward rather than letting them circle the hole

Frequently Asked Questions

When does Black Gum change color and how early does it turn compared to other trees?▼

Black Gum typically begins its fall color transformation in late August to early September across most of its range, often 3–4 weeks before maples and other shade trees. The progression from green to scarlet, orange, and deep purple can happen remarkably fast—sometimes within 7–10 days. This early display makes it exceptionally valuable for extending the fall landscape season. Exact timing depends on your USDA hardiness zone and local weather; cooler nights and sunny days intensify color development and speed the transition.

How tall does Black Gum grow and how much space does it need?▼

Mature Black Gum trees typically reach 30–50 feet tall with a 20–30 foot spread, depending on growing conditions and genetics. Young trees grow slowly—expect 12–24 inches of growth per year. Space single trees at least 20–30 feet from buildings, hardscaping, and other large trees to allow full canopy development. The extensive root system needs room to spread without competing for water and nutrients. In confined spaces, Black Gum is not ideal; it's best suited to spacious landscapes where it can reach its full potential.

Can I grow Black Gum from seed, and how long does it take to become a full tree?▼

Yes, Black Gum grows from seed, but germination is slow and requires cold stratification (120–180 days of moist, cold treatment at 40°F). Scarify the seed coat lightly and stratify seeds over winter outdoors or in a refrigerator, then sow in spring. Germination takes 30–60 days. Seedlings grow very slowly—expect 1–2 years to reach a transplantable size of 12–18 inches. It takes 15–25 years to develop meaningful shade and fall color display. Buying young nursery trees (3–5 years old) dramatically shortens the timeline.

Is Black Gum good for beginners and low-maintenance landscapes?▼

Yes, Black Gum is excellent for beginners once established. It requires no fertilizing, minimal pruning, and has virtually no pest or disease problems. The only significant requirement is choosing the right site at planting—full sun and well-drained, slightly acidic soil. The critical beginner mistake is buying a large tree and attempting to transplant it; instead, start with a young 4–6 foot nursery tree and plant it in spring. From that point forward, it largely takes care of itself, asking only for water during the first two growing seasons.

Why is Black Gum difficult to transplant and when is the best time to move one?▼

Black Gum develops a strong central taproot and a relatively shallow, fibrous feeder root system. Mature trees cannot be successfully dug and moved—the taproot breaks, and the tree rarely recovers. Always plant young trees (2–4 years old) in their permanent location in early spring. If you have an established Black Gum you need to move, the success rate is very low, and professional tree moving services may be your only option. It's far better to remove and replant with a young tree than attempt to transplant a mature specimen.

What zone is Black Gum hardy in and can it grow in my region?▼

Black Gum is hardy in USDA zones 4–9, thriving across most of eastern North America from Maine to Texas. It performs best in zones 5–8, where it develops its fullest fall color. In zone 4, growth is slower and color may be less intense. In zone 9 and warmer, it struggles; fall color is muted, and the tree may not fully enter dormancy. Check your zone before planting. Black Gum also prefers regions with cool nights in fall to trigger the biochemical processes that produce brilliant foliage pigments, so performance in hot-summer climates is mediocre.