Shrub · Vitaceae
Grape
Vitis vinifera
A grapevine carries broad lobed leaves, clinging tendrils, and hanging clusters of glossy berries, and given full sun and a hard prune it fruits for decades.
Full sun
Every 7–14 days
730–1095 days
USDA 6–10
Overview
A grapevine is a long-lived woody climber, its older stems thickening into rough, twisting wood while slender new canes throw out curling tendrils that grip and haul the vine upward. People have grown it for its fruit for thousands of years. The European wine grape sits at the heart of most vineyards, while American species and hybrids fill the colder corners, and a well-placed vine can keep fruiting for decades.
The vine's broad, lobed leaves fan out along the canes and catch the full sun it needs, backed by deep well-drained soil and something strong to climb. Left unpruned the woody stems stretch and sprawl to 40 to 60 feet (12 to 18 m), which is why the yearly pruning cuts so deep. It grows fast, sending out long green shoots that harden into wood, and only steady cutting turns that reach into fruit.
The reward hangs in tight clusters of round, firm berries, their skins glossy and taut and their color running from pale green through red to deep blue-black by variety. A young vine spends its first couple of years laying down roots and a framework of permanent wood, and the fruit takes 2 to 3 years to swell on the cluster. Once settled, the vine hangs out grapes for fresh eating, juice, raisins, or wine year after year.
Care
The short version: full sun, deep well-drained soil, and a sturdy trellis or arbor for the woody stems and tendrils to climb. Water young vines well to settle them, keep the nitrogen light, and prune hard every winter so the bare wood pushes fruit rather than leaves.
Light
Grapes want full sun, ideally striking the broad leaves all day. They will take a little partial sun, but in shade the vine grows leafy and lax, the fruit sets poorly, and disease builds in the damp, dim canopy.
Water
Water young vines deeply every 7 to 14 days while the roots take hold. Once those roots run deep, a mature vine handles dry spells well, so ease off; keep the soil off the soggy side and skip overhead wetting, both of which leave a wet film that invites fungus.
Soil
Set the vine in deep, loamy, humus-rich soil that drains freely around its roots. It takes a fair range of soils and a pH from 5.5 to 7.0, but it will not forgive ground that stays wet.
Temperature
Grapes weather a wide swing, roughly 5°F to 95°F (-15°C to 35°C) depending on the type. American grapes and hybrids stand the cold on their woody canes far better than the European wine grapes, so match the variety to your winters.
Humidity
Grapes favor low humidity, around 30% to 60%. Damp, still air clinging to the leaves is what feeds powdery mildew and black rot, so an open canopy and moving air matter more than any reading on a gauge.
Feeding
Feed once in early spring as the buds break and new shoots push, using a balanced fertilizer such as 10-10-10. Keep the nitrogen light, since too much drives leafy green growth and starves the fruit.
Pruning
Prune hard every winter on the bare, dormant wood, cutting out roughly 80% to 90% of last year's canes. Train what remains onto a strong trellis or arbor with cane or spur pruning to suit the variety. No other task shapes the season more.
Repotting
Grapes belong in open ground or a large permanent container, not in routine repotting. Where one grows in a pot, size it up before the roots begin circling the wall, or the vine stunts and dries out fast.
Size & spacing
Pruned and trained on its support, the vine holds around 5 to 20 feet (1.5 to 6 m) tall with a spread of 4 to 10 feet (1.2 to 3 m). Left uncut, the woody stems can stretch to 40 to 60 feet, so give it a sturdy frame and room to be worked.
When to plant
The grapevine keeps a slow, visible clock. Set bare, dormant vines out in early spring once hard frost has passed, then cut the leafless wood back hard each winter while the vine sleeps. Small greenish flower clusters open in late spring, and the berries color and swell from late summer into fall, though the first real crop hangs a couple of years off.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Early spring after danger of hard frost has passed, as dormant bare-root or potted vines
- Harvest: Blooms late spring; fruit harvested late summer to fall (roughly Aug-Oct depending on variety and climate)
Hardiness
USDA hardiness zones: 6–10
Temperature: down to -23°C
Troubleshooting
Most grape trouble shows on the plant itself: a powdery film or spots on the leaves, shriveled or stripped berries on the cluster, or swellings hidden on the roots. Fungal disease in a damp, crowded canopy, soil pests, and hungry wildlife are the usual causes. Match what you see below, then act before it runs through the vine.
Tan-spotted leaves and hard, blackened, shrunken berries
Black rot takes hold in warm, wet weather and paints the leaves with tan spots ringed by dark, sharp-edged borders before it strikes the fruit. The berries wither on the cluster, hardening into wrinkled black mummies the size of shrunken beads. It can hollow out a whole crop, so move early: pick off the mummies and infected canes, prune for airflow, and spray from bud break through fruit set.
Fix:
- Remove and destroy mummified berries and infected canes
- Apply fungicide from bud break through fruit set
- Prune and thin for better airflow
A thinning vine with knotted swellings along its roots
When an own-rooted European vine grows thin and weak, the roots below tell the story: small, hard swellings and galls knot the fine root tissue where grape phylloxera, a tiny underground insect, has been feeding. No spray reaches that depth. The one lasting cure is to replant on resistant American rootstock, whose roots the pest cannot damage.
Fix:
- Replant on phylloxera-resistant American rootstock
- Remove severely affected own-rooted vinifera vines
A chalky white film dusting leaves, shoots, and berries
That flat, chalk-white film sitting on the leaves, shoots, and berries is powdery mildew, a fungus that spreads in warm, humid air and inside a shaded, crowded canopy. The powder smears off under a fingertip, yet it puckers the leaves and leaves the berries scarred with rough brown russeting and splits in the skin. Thin the canopy for airflow, keep the vine in full sun, and hold it back with a preventive sulfur or fungicide spray.
Fix:
- Open the canopy with proper pruning and shoot thinning to improve airflow
- Apply sulfur or a recommended fungicide on a regular preventive schedule
- Site in full sun with good air circulation
Ripe berries pecked open and torn from the cluster
As the berries flush with color and soften, birds and other wildlife peck them open and tear them loose, leaving ragged stubs and half-eaten skins hanging on the cluster. They read ripeness before you do and can strip a bunch bare fast. Drape netting over the vines as the fruit begins to color, then pick the grapes promptly once they ripen.
Fix:
- Drape bird netting over vines as fruit begins to color
- Harvest promptly once fruit is ripe
Toxicity
The ripe, glossy berries are a safe, everyday fruit for people, but the very same grapes are seriously dangerous to dogs and cats. Grapes and raisins can cause acute kidney failure, and even a small amount may be enough. Keep the fruit, fallen berries, and vine prunings well away from pets, and treat any ingestion as an emergency.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Toxic
The plump, glossy berries are just as unsafe for cats as for dogs. The same kidney damage is the danger, so keep whole fruit and any fallen grapes out of reach and call a vet at once if a cat eats one.
Dogs Severe
Even a single small berry can set off acute kidney failure. Watch for vomiting, diarrhea, low energy, a lost appetite, belly pain, heavy thirst, and less urine. This is an emergency, so call a vet immediately rather than waiting for the signs to build.
Horses Caution
The risk to horses has not been studied well. Keep the fruit, the dried raisins, and the trimmed vine prunings away from them rather than offering a berry as a treat.
Rabbits Caution
The evidence for rabbits is unsettled either way. Leave grapes and raisins off entirely and keep to the leafy greens and hay known to be safe.
Livestock Caution
How the fruit affects cattle, goats, and sheep is unclear. With the kidney risk seen in pets in mind, fence off dropped berries and keep prunings out of grazing areas.
Birds Caution
Grape toxicity in birds has not been pinned down. To be safe, keep grapes and raisins away from pet birds and watch any poultry that range near the fruit-laden vines.
People Safe
For people the ripe, juicy berries are a safe everyday fruit, eaten fresh off the cluster, dried into wrinkled raisins, or pressed for juice and wine. The danger falls on pets, not on you.
Keep fruit, prunings, and fallen grapes out of reach of dogs, and never feed grapes or raisins to pets. Grapes and raisins are also advised against for cats as a precaution.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
The grapes a home grower is most likely to meet split into the small-berried European wine grapes, the cold-hardy American types with looser skins, and the hybrids that carry a bit of both. Their berries range in size, skin, and color from vine to vine.
'Cabernet Sauvignon' (V. vinifera)
A classic European wine grape hung with small, dark, deep-colored berries, it needs a long, warm season and does best in zones 6 to 9.
'Thompson Seedless' (V. vinifera)
A seedless grape with pale green berries, it is the same fruit most often dried down into wrinkled raisins.
'Concord' (American Vitis labrusca)
A blue-black grape with a loose, slipping skin over soft pulp, cold-hardy and grown for juice and jelly beyond the range vinifera can take.
'Niagara' (American Vitis labrusca)
A cold-hardy white labrusca with pale, greenish-gold berries and a bold foxy flavor, used for both juice and white wine.
'Reliance' (interspecific hybrid)
A seedless red table grape, its round berries flushed a clear red, bred for cold hardiness and better disease resistance.
Companions
Grapes do best with low plantings that improve the soil or warn of disease early, and worst near big trees that steal their light and water.
Plant near
Roses: Traditionally planted at vineyard row ends as an early-warning indicator, since powdery mildew often appears on roses before the vines.
Clover or legume cover crops: Living mulch between rows improves soil and reduces erosion without heavily competing once vines are established.
Keep apart
Large shade trees: Compete for light, water, and nutrients and cast shade that reduces fruiting and worsens disease.
How to propagate
A grapevine reproduces readily from its own wood and canes, so most new plants are clones rather than seedlings. Cuttings and layering start from lengths of the vine itself and are simple, while grafting takes more skill but joins a good top to roots that beat phylloxera.
Stem cuttingsEasy
Late winter while the vine is dormant · Roots in one growing season; fruiting in about 2-3 years
In late winter, while the wood is bare and dormant, cut pencil-thick lengths of hardwood that each carry 3 to 4 plump buds. This is the standard way to raise own-rooted American types and rootstocks, and the firm cuttings push roots over a single growing season before they bear fruit in about 2 to 3 years.
LayeringEasy
Spring to early summer · Roots within one growing season
In spring or early summer, bend a low, flexible cane down against the soil and bury a stretch of it so roots break from the buried nodes. Within one growing season the buried length has grown a root system of its own, and the new-rooted cane can be cut free from the parent vine.
GraftingDemanding
Late winter as a bench graft, or in spring · 1-2 years to a productive vine
Join a European vinifera scion to a length of phylloxera-resistant American rootstock, worked as a bench graft over the bare late-winter wood or out in the field in spring. It is standard practice where phylloxera lives in the soil, and the healed union grows into a productive vine within 1 to 2 years.
Myths
Only dried raisins are dangerous to dogs, not fresh grapes.
The plump fresh berry is every bit as dangerous as the shriveled raisin, and so are sultanas and currants. All of them can cause acute kidney failure in dogs, whether the fruit is fresh and firm or dried and wrinkled.
Seedless or peeled grapes are safe for dogs.
Neither the seeds inside nor the smooth skin around them carries the harm, so stripping them away does nothing. Seedless and peeled grapes stay just as toxic, and since the dangerous dose is unpredictable, no amount is worth the risk.