Shrub · Vitaceae
Grape
Vitis vinifera
Give a grapevine full sun, a sturdy support, and one hard prune a year, and it will reward you with fruit for decades.
Full sun
Every 7–14 days
730–1095 days
USDA 6–10
Overview
A grapevine is a long-lived woody climber that people have grown for its fruit for thousands of years, so you are joining a very old and forgiving tradition. The European wine grape anchors most vineyards, while American species and hybrids happily fill the colder corners where it struggles. Plant one with care and it can keep giving you fruit for decades.
What a grape asks for is simple: full sun, deep well-drained soil, and something strong to climb. Left to its own devices the vine sprawls and reaches up to 40 to 60 feet (12 to 18 m), which is exactly why that yearly prune matters so much. It grows fast, and your job is only to guide that energy back toward the fruit.
This is a plant that rewards a little patience, and there is no rushing it. A young vine spends its first couple of years quietly building roots and a framework, and the fruit takes 2 to 3 years to arrive. Once it has settled in, though, you have a vine that hands you 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 to climb on. Water young vines well to get them going, go gentle on the nitrogen, and give one firm prune every winter, and the vine will stay productive and happy.
Light
Give grapes full sun, all day if you can. A little partial sun is fine, but too much shade leaves you with a leafy vine, disappointing fruit, and far more disease brewing in the damp, dim canopy.
Water
While a young vine settles in, water it deeply every 7 to 14 days and it will thank you for it. Once its roots run deep, a mature vine copes with dry spells beautifully, so you can ease off and steer clear of soggy soil and overhead wetting, both of which invite fungus.
Soil
Set the vine into deep, loamy, humus-rich soil that drains freely. It is easygoing about a fair range of soils and a pH from 5.5 to 7.0, but ground that stays wet is the one thing it truly will not forgive.
Temperature
Grapes handle a wide range, roughly 5°F to 95°F (-15°C to 35°C) depending on the kind. American grapes and hybrids take the cold much better than the European wine grapes, so choose a variety that suits your winters and you are off to a strong start.
Humidity
Grapes are happiest in low humidity, around 30% to 60%. Damp, still air is what feeds powdery mildew and black rot, so an open canopy and good airflow do far more good than any reading on a gauge.
Feeding
Feed just once in early spring as growth begins, using a balanced fertilizer such as 10-10-10. Keep the nitrogen modest, because too much pushes leafy growth and quietly steals your fruit.
Pruning
Prune hard every winter while the vine rests, taking away roughly 80% to 90% of last year's wood, and try not to be timid about it. Train the vine onto a strong trellis or arbor and use cane or spur pruning to suit your variety. This one job matters more than anything else in the grape year.
Repotting
Grapes are built for the ground or a large permanent container, not for regular repotting. If you do keep one in a pot, move it up a size before the roots begin to circle, or the vine will stunt and dry out quickly.
Size & spacing
Once pruned and trained, a vine settles at around 5 to 20 feet (1.5 to 6 m) with a spread of 4 to 10 feet (1.2 to 3 m). Left unpruned it can stretch to 40 to 60 feet, so give it a sturdy support and enough room to keep it easy to manage.
When to plant
A grapevine keeps its own slow, steady schedule, so let it. Set dormant bare-root or potted vines out in early spring once the hard frost has passed, then prune them back firmly each winter while they sleep. The vine flowers in late spring and ripens its fruit from late summer into fall, and though that first real harvest is still a couple of years away, it is well worth the wait.
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 troubles trace back to fungal disease in damp, crowded growth, to pests hiding in the soil, or to wildlife arriving for the ripe fruit. The good news is that catching things early usually saves the crop. Find what matches below, take a breath, and act before it can spread through the vine.
Spotted leaves and berries drying into hard black knots
This one asks for a quick response, but you can manage it. Black rot arrives in warm, wet stretches, showing first as tan spots ringed with dark edges on the leaves before the berries shrivel into black mummies on the cluster. Because it can claim a whole crop, act while it is early. Pick off the mummified fruit and infected canes, prune so air moves freely, and spray from bud break through fruit set to keep it from spreading.
Fix:
- Remove and destroy mummified berries and infected canes
- Apply fungicide from bud break through fruit set
- Prune and thin for better airflow
A vine slowly weakening with swellings on its roots
If an own-rooted European vine keeps losing steam and you find galls on its roots, the culprit is grape phylloxera, a tiny insect feeding down in the soil. No spray reaches it, so try not to chase that dead end. The dependable answer is to replant on resistant American rootstock, which the pest simply cannot harm, and your new vine can thrive.
Fix:
- Replant on phylloxera-resistant American rootstock
- Remove severely affected own-rooted vinifera vines
A pale dusting spreading over leaves, shoots, and fruit
Do not panic if you spot this. It is powdery mildew, a fungus that settles in when the weather turns warm and muggy and the vine gets too leafy and shaded. The dust wipes away easily enough, though left alone it curls the leaves and roughens and splits the berries. You can turn this around by opening the canopy with good pruning, keeping the vine in full sun, and staying gently ahead of it 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
Clusters getting pecked and cleared as they ripen
It is a little heartbreaking, but birds and other wildlife notice ripe grapes before you do, and they can clear a cluster in no time. The easy save is to drape netting over the vines as the fruit begins to color, well before it is truly ripe. Then pick your grapes soon after they are ready instead of leaving them hanging as a temptation.
Fix:
- Drape bird netting over vines as fruit begins to color
- Harvest promptly once fruit is ripe
Toxicity
You can eat ripe grapes with no worry at all, but they are seriously dangerous to dogs and cats. Grapes and raisins can bring on acute kidney failure, and even a small amount may be enough to cause harm. Keep fruit, fallen grapes, and prunings well clear of your pets, and treat any amount they eat as an emergency.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Toxic
Please treat grapes and raisins as unsafe for cats as well. The same kidney harm that worries owners of dogs is the concern here, so tuck fruit and fallen grapes well out of paw's reach and call a vet right away if your cat manages a nibble.
Dogs Severe
Even a little can set off acute kidney failure, so this is one to take seriously. Keep an eye out for vomiting, diarrhea, low energy, a fading appetite, belly pain, heavy thirst, and less urine than usual. Rather than waiting for those signs, call a vet at once and let them guide you.
Horses Caution
The risk to horses simply has not been studied well. The kind thing is to keep grapes, raisins, and vine prunings away from them and skip offering the fruit as a treat.
Rabbits Caution
There is no clear evidence either way for rabbits, so it is best not to gamble. Leave grapes and raisins off the menu and stay with the greens and hay you already know are safe.
Livestock Caution
How grapes sit with cattle, goats, and sheep is not settled. Given the kidney trouble seen in pets, it is wise to fence off dropped fruit and keep prunings clear of grazing areas.
Birds Caution
Grape toxicity in birds has not been worked out. To stay on the safe side, do not feed grapes or raisins to pet birds and watch over any poultry that wander near the vines.
People Safe
You can enjoy ripe grapes with an easy mind, whether fresh, dried into raisins, or pressed for juice and wine. The worry is entirely for your pets, not for 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
Grapes fall broadly into the European wine grapes, the cold-hardy American types, and the hybrids that gently bridge the two. These few are the ones a home grower is most likely to come across.
'Cabernet Sauvignon' (V. vinifera)
This classic European wine grape carries small dark berries and wants a long, warm season, doing its best in zones 6 to 9.
'Thompson Seedless' (V. vinifera)
A gentle green table grape without seeds, this is also the one most often dried down into raisins.
'Concord' (American Vitis labrusca)
This hardy blue-black slip-skin grape is grown for juice and jelly and shrugs off colder zones than vinifera can bear.
'Niagara' (American Vitis labrusca)
A cold-hardy white labrusca with a bold foxy taste, it serves nicely for both juice and white wine.
'Reliance' (interspecific hybrid)
A friendly seedless red table grape, bred for cold hardiness and to stand up better to disease.
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
One of the joys of grapes is how readily they multiply from the vine itself, so most new plants are clones rather than seedlings. Cuttings and layering are wonderfully simple, while grafting takes a bit more skill but neatly solves the phylloxera problem.
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 vine is still resting, take pencil-thick dormant hardwood cuttings that each carry 3 to 4 buds. This is the friendly, standard way to start own-rooted American types and rootstocks, and you can expect the cuttings to root across one growing season before they begin fruiting in about 2 to 3 years.
LayeringEasy
Spring to early summer · Roots within one growing season
In spring or early summer, bend a low cane down to the ground and bury a section so it can root at the buried nodes. Give it one growing season and it will have grown its own roots, at which point you can happily snip it free from the parent vine.
GraftingDemanding
Late winter as a bench graft, or in spring · 1-2 years to a productive vine
Join European vinifera scions to phylloxera-resistant American rootstock, either as a bench graft in late winter or out in the field come spring. It takes a steadier hand, but it is the standard route where phylloxera lives in the soil, and the graft settles into a productive vine within 1 to 2 years.
Myths
Only dried raisins are dangerous to dogs, not fresh grapes.
It is easy to assume the fresh fruit is milder, but that is not so. Fresh grapes are just as risky as raisins, and sultanas and currants belong on the same list. Any of them can bring on acute kidney failure in dogs, fresh or dried alike.
Seedless or peeled grapes are safe for dogs.
The seeds and skin are not what causes the harm, so removing them changes nothing. Seedless and peeled grapes stay every bit as toxic, and since the dangerous dose cannot be predicted, no amount is a safe bet for your dog.