How much wall space does a grapevine need? Is it better to grow one plant or several? Here we'll assist you with the planning of your wall greening project and finding an appropriate training method. The tips can -- with some reservations -- also be applied to climbing roses, espalier fruit, and other climbing plants.
First you need to consider which (sunny!) part of the wall is suitable for greening with grapevines. An entire facade, a gable, a strip of wall, or even an angle can be used as a greening area. Greening areas should have a distance of 30 cm from windows and doors-- not just for architectural reasons, but also to prevent creepy-crawlies from entering via the grapevines. A greening area should be no lower than about 50 cm off the ground to allow room for watering.
The minimum area for a house grapevine is 1m x 1m or 0.5m x 1.5m (width x height). Although a single vine can cover 50 m², growing to this size takes several years. This is why large greening areas are divided up into smaller sections of several plants, so that each grapevine has an area of 3 - 6 m² of wall space. It is best to plant several varieties to minimise the risk of failure (this way, the vines spread over time and you can avoid losing the whole thing at once in the event of extreme weather events). Plant spacings vary depending on the training form and circumstances-- that is, you may want to plant only one grapevine, because creating several planting areas in the street pavement is quite expensive. It is also possible to plant 2 - 3 different vines in the same planting area/pit ("quiver" style planting).
Selecting the correct training form depends on the size and shape of the greening areas. For beginners, garlands and fan forms (with some reservations) are particularly suitable. All other training forms, though manageable, require particularly rigorous pruning. It is also important that beginners concentrate on one training form only, even if several areas are to be greened.
Climbing aids do not end flush with the outer edges of the greening area, but rather are set back on all sides by 10 - 20 cm. The shoots and leaves will grow past the trellis system, and are trimmed back in summer to stay within the planned dimensions of the greening area. Depending on the desired width, trellises can have 1 - 3 (or more) parallel wires... you will find further tips under wire rope systems for each appropriate training form.