Spacing & sowing

Plant spacing

5 ft 11 in

In-row spacing

4 ft 11 in

Between rows

8 ft 2 in

Square-foot density

Not suited to SFG

Calendar (from your frost dates)

Plant out

at the last spring frost

First harvest

150 days after the last spring frost

Harvest ends

14 days before the first fall frost

Growing

Type

Fruit · Perennial

Botanical family

Mixed / other

Sunlight

Full sun

Watering

Low–moderate

Soil

Free-draining, moderately fertile

Feeding

A potassium-rich feed in spring, then a liquid feed every two weeks once the fruit has set.

USDA zones

4a–10b

Frost tolerant

Yes

Flowering

June

Pruning

Cut hard in midwinter, and pinch the side-shoots back through summer.

Through the year

• Apr–Jun Bud Break
• Jun–Jun Flowering
• Jun–Sep Fruit Set
• Sep–Oct Harvest
• Oct–Nov Growing
• Nov–Dec Leaf Fall
• Jan–Apr Leaf Fall

Harvest

When

Late August to October depending on variety and climate (greenhouse vines earlier); vines crop lightly in year 3 and fully by year 5. Leave bunches longer than you think — color arrives weeks before flavor.

What to look for

Taste is the only reliable test: sweet with softened acidity. Supporting cues: full color bunch-wide, translucent berries, brown (not green) seeds, a woody-brown bunch stem, and a dusty bloom. Berries detach easily from the stem when truly ripe.

How to harvest

Cut whole bunches with secateurs, holding by the stalk — never the berries, to keep the bloom intact. For long-hanging storage cut with a length of cane ("T" of stem) attached.

How often

Bunches ripen over several weeks; cut each as it reaches flavor rather than stripping the vine, and snip out any split or moldy berries within bunches as the season runs.

Storing the crop

Refrigerate unwashed up to 1–2 weeks. Traditional long storage: stand the cut cane-end in a bottle of water in a cool room and bunches keep for weeks. Otherwise juice, make jelly, dry to raisins (sweet seedless types), or freeze berries for eating frozen — fresh texture doesn't survive thawing.

Companions

Hyssop, Chives, Roses (as disease indicators)

Pests & problems

• Vine weevil Adults notch leaf edges at night; their plump C-shaped grubs devour roots, especially in containers. Hand-pick adults after dark and water in biological nematodes in late summer.
• Birds Birds and wasps
• Downy mildew Yellow patches on the upper leaf with gray-purple mold beneath, in cool wet weather. Improve air circulation, water at the base, and remove infected leaves promptly.
• Gray mold (botrytis) Fuzzy gray mold on flowers, fruit, and soft growth in cool, damp, still air. Remove affected parts promptly, thin congested growth, and ventilate under cover.
• Powdery mildew A white dusty coating over leaves and shoots when roots are dry but the air is humid. Keep plants watered and mulched, prune for airflow, and remove the worst leaves.

Garden allies

Beneficial predators that hunt this plant's pests — grow their favourite flowers nearby to recruit them. ★ companion plant

• Beneficial nematodes Steinernema & Heterorhabditis spp.
  Hunts Vine weevil

  Microscopic worms watered onto damp soil that hunt down soil-dwelling grubs and release a bacterium that kills them within days. Timing is the whole thing: warm, damp soil and a small target grub, which means late summer for most of what they are used against.

• Frogs & toads Anura
  Hunts Vine weevil

  A resident toad works the beds every night for slugs, cutworms, and weevils. Recruit them with water — even a sunken basin pond — plus damp shade and an upturned-pot toad house; skip the slug pellets that poison their prey.

• Ground beetle Carabidae
  Hunts Vine weevil

  Fast, glossy night hunters that patrol the soil surface for slugs, cutworms, and root-fly larvae. Give them daytime cover — thick perennial edges, stepping stones, a log — and skip the tillage that wrecks their burrows.

  Plant nearby LavenderMintThyme
• Hedgehog Erinaceus europaeus
  Hunts Vine weevil

  A European animal, and worth saying so plainly: there are no hedgehogs in North America, and the ally that does the same night shift here is the toad, the opossum or the ground beetle. Where they do occur, cut a gap in the fence and skip the pellets.

Companion planting

Good neighbors

• Geranium Repels pests
• Mustard greens Living mulch
• Hyssop Draws pollinators