Photo: James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org — CC BY 3.0 · source
Survives zone 5 through 9
Harvest calendar
Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.
Summer grape is one of the few wild American grapes valued for its own fruit and wine rather than only as rootstock — it is the wild parent behind 'Norton'/'Cynthiana', a Missouri-bred cultivar still made into serious dry red wine, and its high sugar and good winemaking qualities set it apart from most other wild Vitis. ⚠ Know the look-alike: across eastern and central North America, moonseed (Menispermum canadense) twines alongside wild grapes, carries similar dark hanging clusters, and is potentially fatal. Three checks — a grape has 2–4 rounded, pear-shaped seeds while moonseed has ONE flat crescent seed; a grape climbs by forked tendrils and moonseed has none; a grape's leaves are toothed and moonseed's are not. Open a berry and look at the seed before eating any wild grape.
- Hardiness
- Zone 5–9
- Habit
- Vine
- Edible part
- Fruit
- Ripens
- Sept–Oct
- Mature size
- Vine 10–20 m unchecked; trained on a wire it is held to 2–3 m
- Light
- Full sun
- Soil pH
- 6.0–7.0
- Environment
- Temperate
- Native range
- Eastern and central North America, from southern Ontario and Maine west to Wisconsin and Oklahoma, south to Texas and Florida.
- Status
- Both wild and cultivated
- Years to fruit
- 2–3 yrs
- Growth speed
- Fast — a deciduous climber that can reach 10–20 m given support.
- Spacing
- 550 cm (217 in) apart — about 30 m² (326 sq ft) per plant
- Leaf shape
- Broadly heart-shaped, shallowly to deeply 3- or 5-lobed leaves; young growth and the leaf underside are covered in a distinctive reddish-brown, cobwebby (floccose) tomentum over a waxy pale bloom, fading to patchy hairiness with age.
- Root system
- Deep, woody climbing-vine root system typical of tree-scaling wild grapes; less commercially exploited for rootstock breeding than V. berlandieri or V. riparia, but its disease-resistance genes have been bred into cultivars via crosses.
- Fruit description
- Small grapes 5–14 mm across, dark purple to black, in loose clusters, with juicy flesh, 2–4 seeds, and a flavor ranging from tart to sweet once fully ripe.
- Propagation
- Seed germinates after about six weeks of cold stratification, sown in a cold frame as soon as ripe; also readily propagated from dormant hardwood cuttings of the current season's growth taken in December–January.
- Pollination
- ⚠ DIOECIOUS — needs male + female (a vigorous fruitless wild vine is usually a lone male)
The edible parts listed above are a starting point, not a field guide. Identify a plant with certainty — ideally against a local authority — before eating any part of it, and read the full disclaimer. Spotted something wrong? Report it.
Growing guide
Fertilizing. Prefers deep, rich, moisture-retentive but well-drained loam and performs best on calcareous (lime-rich) soils; a balanced fertilizer applied during the growing season is enough — heavy nitrogen pushes leafy growth at the expense of fruit.
How it spreads. Vigorous tendril-climber that scrambles high into trees (10 m or more) in the wild; spreads locally by seed dispersed by birds and mammals that eat the fruit.
Growing tips. Norton, its best-known descendant, carries V. aestivalis resistance to Pierce's disease, powdery mildew, downy mildew and black rot, making the species itself a valuable disease-resistance source; needs full sun to ripen fruit (fruits poorly in shade) and a sturdy trellis, with pruning done only in winter dormancy since cut canes bleed sap heavily if pruned in spring.
Companion planting. Wild stands of V. aestivalis growing near vineyards are a well-documented natural reservoir of black rot (Guignardia bidwellii) inoculum, with airborne ascospores able to infect cultivated vines from over 100 m away — a reason growers clear nearby wild grapevines.
Grow journal
Sign in to keep a dated log of when you planted, bloomed and harvested this plant.