How to Grow Grapes – Vitis vinifera

How to Grow Grapes – Vitis vinifera

Varieties

Choose a variety of grapes suitable for cropping in a cold greenhouse — ‘Black Hamburgh’ is one that is widely available. Outdoor varieties usually produce grapes more suitable for wine making, whilst some greenhouse varieties such as muscats need heat in most areas.

Planting

Good drainage is essential, so provide a soakaway if there is any danger of waterlogging. Dig a large planting hole, and make a mixture of good soil and compost (roughly 3:1), or good soil, manure, and leaf mould (roughly 4:1:1), for planting into — add a handful each of bone meal and seaweed meal. Ideally, plant the grape-vine between late autumn and late winter, cutting the plant back to 15cm.

Growing

How-to-Grow-Grapes-Vitis-vinifera In a small greenhouse, train just a single permanent stem or rod, which each year will produce the side shoots upon which grapes form. This will give a worthwhile crop without taking over completely, although you must be prepared to spend time pruning, tying in, and thinning. Keep the vine well watered from the time that growth starts in spring right through the summer, and mulch with compost or well-rotted manure. To get the best grapes and reduce the risk of fungal disease, thin out the grapes when they are the size of small peas, removing the inner ones and tiny ones from each bunch with pointed scissors. Reduce watering when they start to ripen, and ventilate the greenhouse well.

Harvesting

Harvest from early to mid-autumn.

Pests, diseases, and disorders

Mealybug and red spider mite are common pests; powdery mildew and botrytis the most troublesome diseases.

 

Pruning grape-vines

  • First summerAllow one main stem to grow. Shorten the side growths to five leaves, and any secondary growths from these to one leaf. Pinch off any flowers that form. Tie in growths loosely to strong horizontal wires spaced 23cm apart.
  • Following winter –  Cut back the main stem by about half, and side growths to about 2.5cm, leaving one or two good buds.
  • Following summer Allow the main stem to extend. Tie in one side shoot from each bud, rubbing off any extra. Let one or two grow until flower trusses form and stop them two or three leaves beyond. Shorten the others as before, and shorten any secondary growths.
  • Following winter Cut back new growth on the main stem by half and the side growths as before.
  • Subsequent years In summer, tie in single side growths as before. Allow them to grow until flowers form, and pinch them out two or three leaves beyond the bunches. Pinch out secondary growths to one leaf. Stop the main stem when it has filled its allotted space. In winter, cut back side growths as before.

29. November 2010 by admin
Categories: Fruit Gardening, Gardening Ideas | Tags: | Comments Off on How to Grow Grapes – Vitis vinifera

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