How to Use Grapevines Over a Window

Preparing the Planting Area

• 1

  Set up the grape support system around the window. Either install trellises around the window or put nails into the exterior wall for the grape tendrils to grab onto.

• 2

  Apply some organic material, such as compost or manure, to the planting area. Grapes like at least somewhat fertile soil. Spread an inch or 2 of the organic material over the surface of the soil, and mix it into the ground with a tiller or gardening fork.

• 3

  Test the soil pH with a soil testing kit. Grapes grow best in a slightly acidic soil. They tolerate a pH as high as 6.5 but grow best in a pH between 5 and 6.

• 4

  Add lime to raise the soil pH or sulfur to lower the soil pH, depending on the results of the soil test.

Planting the Grapes

• 5

  Prune off any damaged parts of the starter grapevines and roots before planting in the spring. Also trim off the least vigorous canes, so the plant can focus its energy on growing the most vigorous single cane.

• 6

  Plant the grape starters at the base of the window during spring. Small windows probably only need a single grape plant, but large windows can have multiple plants spaced at least 6 feet apart. To plant the starters, bury the root ball in the soil at the same height as it sat in its starter pot.

• 7

  Water the new plant immediately to help the soil settle around the roots.

• 8

  Add more soil if the water makes the area around the plant cave downward as the soil settles.

Caring for the Grapes

• 9

  Loosely tie the new vines to the trellis or to wooden stakes with twine or cloth strips to keep them off the ground and train them to grow upward towards the window.

• 10

  Apply an inch-thick layer of mulch over the surface of the soil beneath the plant to help the soil hold in water and maintain a constant temperature.

• 11

  Apply 8 oz. of a balanced fertilizer to each grape plant about a week after planting. Ohio State University Extension recommends a 10-10-10 ratio fertilizer.

• 12

  Water the vines during very dry weather. Grapes often need no irrigation, but give them some water during dry conditions to keep them growing.

• 13

  Fertilize the grapevines each year during the spring. Increase the amount of fertilizer to .5 to 1 lb. in the second year and then to 1 to 1.5 lbs. in the third year, depending on how fertile your soil already is.