How Far Apart To Plant Wisteria

Wisteria vines typically start blooming in the spring and may continue into the summer.

Types of wisteria:

There are two varieties of wisteria: Asian and American. Although aggressive growers, Asian wisterias are well-known for their stunning blossoms. American wisterias are less aggressive and still produce beautiful blossoms. Compare the most popular wisteria varieties.

Flower color:

Wisteria comes in a range of colors, such as white, pink, and blue tones, in addition to the well-known purple blossoms. If you believe you have seen a yellow wisteria flower, it was probably a golden chain tree (Laburnum).

Foliage:

Wisterias are deciduous, which means that when the weather becomes chilly in the fall, they lose their leaves. The misunderstanding is occasionally brought on by a different vine known as evergreen wisteria (Millettia reticulata).

Avoid planting aggressive wisterias close to your home as they can cause damage and have even been known to destroy buildings.

Wisterias can be grown in full sun or partial shade, but to promote healthy bloom development, make sure the vines get at least six hours of direct sunlight everyday. If you reside in a colder area, pick a planting location that is protected because a heavy spring frost can harm the flower buds.

Create a planting hole that is the same depth as the plant and twice as wide, then level the plant with the soil surface. Because the vines will soon fill in, you should space your plants at least 10 to 15 feet apart along the support structure.

Wisterias don’t need much care once they are planted to promote healthy growth. Water frequently over the first year until the roots take hold.

After planting, wisterias could take some time to come out of dormancy and might not start to leaf until early summer. They will leaf out at the regular time the following spring, but don’t be surprised if they don’t bloom. Wisterias take three to five years to reach full maturity and may not start blooming until then.

Wisterias grow quickly and can reach heights of up to 10 feet in in one growing season. That works out well if you need to quickly cover a fence or pergola but don’t want the vines to take over your landscape. Regular pruning (once in the summer and once in the winter) not only controls wisteria’s growth but also encourages more robust flowering by creating a framework of horizontal branches and causing spurs to grow at regular intervals.

Cut back the current year’s growth to five or six leaves in July or August, or roughly two months after the plant flowers, to get rid of stray shoots and make short branches that will produce flowers the following year. Summer pruning needs to be done more frequently. Re-prune the plant in January or February while it is dormant by removing two or three buds from the growth from the previous year.

The first few years of wisteria’s growth are crucial for creating the desired framework for the plant’s development. As soon as your wisteria begins to grow, start connecting particular lateral shoots to its support structure. You should also cut down any extra growth. An aggressive pruning may be required on elder plants to promote the growth of new branches. Cut down aging branches to the main primary stem to accomplish this. The spaces will soon be filled with new side branches that can be connected back into the support structure.

Visit the Royal Horticultural Society to view a video on how to prune wisteria vines properly.

Where shouldn’t wisteria be grown?

In order to support the massive vine, the wisteria’s root system extends out widely and dives deep. Do wisteria roots exhibit aggression? Yes, wisteria’s root system is highly aggressive. Avoid planting wisteria next to walls or walkways because of its extensive and strong root system. These are easily harmed by a wisteria’s root system.

Experts advise inserting a corrugated panel about 6 feet (1.8 m) long and several feet (1 m) broad beside the plant to redirect the roots if you find a wisteria close to a building or pathway.

Which month is ideal for wisteria planting?

The best seasons to plant wisteria are spring or fall, and you should put it in full sunlight to ensure that you get to view its lovely blossoms. A wet, well-draining soil is ideal for wisteria.

How much space can wisteria cover?

Wisteria develops into a huge, mature vine that could grow to be at least 100 feet long. The sturdy stems develop into massive, twisted trunks that are strong enough to topple fences and arbors. It should therefore come as no surprise that mature Wisteria likewise possesses massive, aggressive root systems.

Wisteria vines require substantial roots to anchor the plant because they grow to be so big and heavy. As a result, the root systems spread widely beneath the surface. Wisteria roots can extend up to ten feet deep in old vines that have been growing for many years. Wisteria roots normally grow two to three feet deep. If you grow the vine too close to existing buildings or underground plumbing, wisteria roots may become an issue. However, if the roots encounter something beneath the earth, they will typically work their way around it or proceed in a different direction.

The majority of farmers that experience issues with their wisteria discover that the problem is above ground as opposed to below ground. The roots of wisteria are more likely to grow straight down than outwardly very far. Because the plant climbs, the tendrils and foliage receive the majority of the developing energy. Wisteria can, however, produce suckers from the root system, which you should cut off as soon as you see them to keep the vine in its proper place.

Potential Damage from Wisteria Roots

In rare instances, planting wisteria vines in the incorrect position might result in damage from the vine’s roots. Wisteria is a woody vine, so while it doesn’t often cause issues like big tree roots may, it can nonetheless slink into unfavorable spaces.

There is always a chance that the root system of your Wisteria could harm your septic tank, irrigation system piping, or other underground pipelines, drains, or structures. Wisteria roots, however, aren’t as harmful as some other plants whose roots actively grow outward.

Although uncommon, bigger problems like foundation damage or subsidence are possible. Wisteria roots are unlikely to cause significant harm to your foundation or walls unless you reside in a very old house with flimsy structural underpinnings.

The only possible exception is if your soil is clay-based. Several instances of mature Wisteria roots drying up the soil, causing it to crack, or otherwise weakening the clay in small portions underneath the foundation have been reported. This might result in some little localized settling, but it’s always a good idea to consult a professional if you think your foundation may have been harmed.

There are numerous instances of enormous Wisteria vines flourishing along the brick walls of buildings all around the world. In other situations, the building isn’t being lifted off its foundation or being made to crumble by the roots. It’s actually simply another illustration of Wisteria’s reputation for aggression. When it comes to wisteria, you should concentrate more on managing the growth above ground than you should be concerned about the roots buried in the earth.

Can two wisteria plants be planted close to one another?

You should give your wisteria lots of room to spread out because of its size and rapid growth. You’ll need to prune frequently to prevent the wisteria from suffocating nearby plants and taking over if they are too close.

Wisteria can reach heights of 30 feet and a length of 100 feet or more. It is actually connected to kudzu, another plant that grows rapidly. In California, a famous wisteria tree that has been growing for 100 years spans more than an acre.

Wisteria primarily covers surfaces it can climb on because it is a climbing vine. This means that placing little plants, such bulbs, close to the base of the wisteria won’t cause you too much concern. On the other hand, trees and bushes need to be at least a few feet away.

Additionally, you might want to maintain some space between your house and the wisteria. Wisteria may cover windows, get behind shutters, in gutters, and under roof tiles, damaging the structure even though it looks lovely climbing up the side of a house.

Most individuals only need one or sometimes two Wisteria plants because they grow so enormous. Usually, one Wisteria is enough to wrap over a pergola or trellis. Planting one vine on each side of an arbor is a nice idea if you want wisteria to cover it, although this is merely for aesthetic purposes.

Can wisteria grow on a fence?

Wisteria sinensis or W. floribunda are the two species that we grow the most frequently. The former Chinese wisteria bears its flowers prior to the development of its leaves. The blossoms of the Japanese wisteria floribunda develop simultaneously with its foliage. These details have a significant impact on the species you should choose to raise. W. sinensis thrives on vertical surfaces (house walls, fences, trellises), where its bare blossoms will be best seen. It is preferable for W. floribunda to grow up and over strong arches, arbours, and pergolas. As a result, the longer racemes (bunches of flowers) can hang down and be completely free of the leaves.

How to plant wisteria

Wisterias grow best in soil that is fertile but well-drained. Even though they perform best in direct sunlight, they can tolerate little shade. They can be grown in big containers. To prevent a “rain shadow,” make sure plants are 30–40 cm away from the base when growing up a vertical surface (the dry, shaded area closest to the base of walls and fences). Back the shoot up toward the ground.

Wisteria can be grown into a free-standing specimen; more on that later.

Training wisteria as a climber

When preparing Wisteria to climb, there are only four guidelines to remember:

In July or August, reduce the whippy shoots from the current year to just five or six leaves. This improves bud formation and speeds up wood ripening by increasing air movement and light penetration through the leaf.
In January or February, perform a second cut, only removing two or three buds.
Strong, taut training wires positioned horizontally along a wall or fence are used to train desired shoots. Use soft twine to secure shoots to these wires.
If it’s necessary to remove old, diseased, or unwanted shoots, wisteria will react nicely to hard pruning. However, be cautious since shoots entwine around one another; you don’t want to unintentionally harm good, productive growth.

Training wisteria as a free-standing specimen

In your garden, grow a few free-standing wisterias for something a little different.

Plant a wisteria with a single stem next to a reliable support (1.5m or more). The single stem should be tied in and let to extend all the way to the support’s top.
In the first spring after it has reached the peak, cut off the single stem tip.
Trim the upper side shoots to 15 to 30 cm in length and remove the lower side shoots. The plant now has a sturdy “head” from which to grow.
August is the time to prune August shoots back to seven leaves once the head has gotten sufficiently woody.
To keep your shape, trim any old, undesirable head shoots in the winter.
To reveal flower racemes, trim March shoots back to 2.5 cm of their bases.

Is a trellis necessary for wisteria?

Wisterias thrive in full light, fertile soil, and both. Of the 10 species, three are grown the most frequently: Wisteria brachybotrys, Wisteria sinensis, and Wisteria floribunda, which are native to China, Japan, and the eastern United States (silky wisteria). All three species have significant growth rates and can extend out to a maximum of 20 meters (66 feet) against a wall or around 10 meters (33 feet) in trees. Wisteria can also be trained to grow as a free-standing standard in a big container or border.

Wisterias for pergolas and arches

The Japanese wisteria (Wisteria floribunda) is best exhibited hanging down from a garden structure like a pergola or arch since it has the longest flower sprays (or racemes) of all the species. They entwine in a clockwise motion while simultaneously bearing blooms and leaves. Lilac blue blooms and racemes as long as 1.2 meters (4 feet) are produced by Wisteria floribunda f. multijuga AGM in the early summer.

Wisterias for walls

Wisteria sinensis, often known as Chinese wisteria, blooms in the springtime before the leaves do. For example, Wisteria sinensis ‘Amethyst’ AGM has violet blue blooms with a reddish flush produced in dense racemes to 30cm (1ft) long in late spring or early summer. They twine anticlockwise and the racemes are shorter so they are best presented against a wall.

Silky wisteria (Wisteria brachybotrys), which can be grown against walls or on pergolas, with downy leaves and small racemes of 10-15cm (4-6in). White flowers with center yellow markings, a strong perfume, and 10-15 cm tall sprays of wisteria brachybotrys f. albiflora ‘Shiro-kapitan’ AGM bloom in the spring and early summer.

If you want to cultivate a wisteria in a big container

It is best to choose Wisteria fructens ‘Amethyst Falls’ because of its compact habit and rich clusters of lilac-blue blooms.

Always choose a wisteria that has been developed from cuttings or by grafting when purchasing one because seed-raised wisterias flower less consistently and take longer to bloom. The graft union should be seen as a swelling close to the stem’s base. Unlike species, named cultivars are virtually always grafted. Purchase your wisteria in flower or go with a specific cultivar to avoid disappointment.

Wisterias are offered for sale as container-grown plants at garden centers and online, and you can use the RHS Find a Plant tool to locate particular cultivars.

Wisteria should ideally be planted between October and April. Wisterias grown in containers can be planted at any time of the year, but fall and winter are the easiest times to maintain. Give them healthy, well-drained soil to plant in.

Wisterias bloom best in full sun, so pick a wall or pergola that faces south or west. Although blossoming will be diminished, they will still grow in light shade.

Wisterias are robust climbers that can grow to a height and width of more than 10 meters (33 feet). You’ll need to give support in the form of wires, trellises, or outside buildings like pergolas or arches against a wall. Wisteria can also be grown up a support or taught up a tree to create a standard. A wisteria can be grown in a border or container by being trained into a standard, which reduces its vigor.

If you want to grow your wisteria in a container, you’ll need a sizable one that is at least 45 cm (18 in) in diameter and is filled with potting soil with a loam basis, like John Innes No. 3.

Feeding

Use Growmore or Fish, Blood and Bone on your wisteria in the spring at the suggested rate listed on the packet. Additionally, apply sulphate of potash at a rate of 20g per sq m (1/2 oz per sq yard) on sandy soils (which have low potassium levels). Fertilizers for flowering shrubs or roses are another option.

Feed wisteria in containers using Miracle-Gro, Phostrogen, or another comparable flowering plant food. A different option is to add controlled-release fertilizer to the compost.

Although wisteria has a reputation for being challenging to prune, this is untrue. Once you’ve made it a habit to prune your wisteria twice a year, you should be rewarded with a pleasing flower show.

When you prune regularly, you reduce the excessive, whippy growth from July and August to five to six leaves, or roughly 30 cm (1ft). This increases the possibility of blossom buds budding and permits the wood to ripen. Then, in February, trim these shoots even more to two or three buds, or around 10 cm (4 in), to tidy up the plant before the growing season starts and make it possible to observe the new flowers.

When your juvenile wisteria has completely covered a wall or other garden structure, start the routine pruning to promote flowering.

Small gardens benefit greatly from the training of wisteria as a free-standing standard in a border or container.

Wisteria can be trained to ascend into a tiny tree’s canopy, however doing so could eventually harm the tree. Pruning will be challenging if the plant develops into a huge tree, and a dense leaf canopy will affect flowering.

Increase your wisteria stocks by layering in the summer, taking softwood cuttings in the spring to mid-summer, or taking hardwood cuttings in the winter since seed-raised wisteria can take up to 20 years to flower.

Wisteria is typically propagated via grafting in professional nurseries, however layering is the simplest and most dependable technique for home gardeners.

Established wisteria can produce hanging, bean-like seedpods after a lengthy summer. While wisteria plants grown from seeds are typically of inferior quality, you might want to try growing wisteria yourself.

After the leaves have fallen, gather the seedpods and let them ripen in an open tray.
When the seed is ready, twist open the pod and sow it 2 cm (3/4 in) deep in seed compost.
Before planting if the seed is dry, soak it for 24 hours.

See our commonly asked questions page for a summary of wisteria issues.

Poor flowering

Poor flowering is the most frequent issue for backyard gardeners, and it can be brought on by a variety of factors, such as:

Young plants can take up to 20 years to flower, so acquire a plant that is already in bloom or go with a certain cultivar because they are typically grafted to avoid disappointment.
Examine your pruning methods and timing because early and midsummer trimming will prevent the growth of flowers the next year.
Wisteria flowers best in broad light; deep shadow produces few, if any, flowers.
Water your wisteria during periods of drought from July to September because a lack of water during this time will influence the development of flower buds the next year.
Flower buds may drop before opening as a result of spring frosts, which can harm or deform growing flowers.
Applying sulphate of potash in the spring will encourage bloom production for the next year in soils that may lack potassium.
The damage caused by pigeons or mice can be identified by torn petals or distinctive teeth marks.