In the spring, wisteria blooms ferociously, producing clusters of lilac-colored flowers on fresh growth that develops from spurs off the main stalks. Check out our Wisteria Growing Guide for more information on wisteria maintenance, including planting and pruning.
About Wisteria
Wisteria is a long-living vining shrub with cascades of blue to purple blossoms that, in the spring and early summer, look stunning hanging from a pergola or archway. However, this vine is known to grow fairly heavy and to grow quickly and aggressively, frequently reaching lengths of more than 30 feet. It’s advised not to put wisteria vines too close to your home since they will squirm their way into any crack or crevice they can find.
Beautifully fragrant wisteria flowers offer a feast for the senses. A brown, bean-like pod remains on the plant during the winter after flowering. There are only blooms on fresh growth.
Note: Be careful when planting wisteria! The wisteria plant contains lectin and wisterin, which are poisonous to people, animals, and even pets. If taken in significant quantities, these poisons can result in anything from nausea and diarrhea to death.
Is Wisteria an Invasive Plant?
The wisteria species Wisteria sinensis and Wisteria floribunda, which are not native to North America, are regarded as invasive in several areas. If you want to add a new wisteria to your garden, we advise choosing one of the native North American varieties, such as American wisteria (Wisteria frutescens) or Kentucky wisteria (Wisteria macrostachya), which are excellent alternatives to the Asian species.
Do you want to know how to distinguish between North American and Asian species?
While North American wisteria is not quite as aggressive in its growing tendencies and has smooth seed pods and fruits in addition to more-or-less cylindrical, bean-shaped seeds, Asian wisteria is an aggressive grower with fuzzy seed pods. Another distinction is that the flowers of American and Kentucky wisterias appear in the late spring after the plant has begun to leaf out, whereas those of Chinese wisteria do not.
When to Plant Wisteria
- Plant during the plant’s dormant season in the spring or fall.
- Wisteria can be grown from seed, although plants from seeds frequently take many years to mature and begin to bloom. It is advised to buy wisteria plants that are already established or to begin with a cutting.
Where to Plant Wisteria
- Put a plant in full sun. Even while wisteria will grow in some shade, it won’t likely bloom. Sunlight is necessary.
- Wisteria should be grown in fertile, wet, but well-draining soil.
- Wisteria will grow in most soils unless it is in bad condition, in which case you need add compost. Find out more about soil improvements and getting the soil ready for planting.
- Because wisteria grows swiftly and can easily engulf its neighbors, pick a location apart from other plants.
- Additionally, wisteria is renowned for encroaching on and infiltrating surrounding buildings like homes, garages, sheds, and so on. We highly advise against growing wisteria too near your house!
- Wisteria vines need a very strong support, like a metal or wooden trellis or pergola, to climb on. Plan carefully and use substantial materials to construct your structure because mature plants have been known to become so heavy that they destroy their supports.
Wisteria looks gorgeous growing up the side of a house, but use caution when planting it because it is a very strong vine that will get into any crack or gap!
Caring for Wisteria
- Apply a 2-inch layer of mulch and a layer of compost under the plant each spring to keep moisture in and keep weeds at bay.
- Phosphorus is often used by gardeners to promote flowering. In the spring, work a few cups of bone meal into the soil. Then, in the fall, add some rock phosphate. Study up on soil amendments.
- If you get less than an inch of rain each week, water your plants. (To determine how much rain you are receiving, set an empty food can outside and use a measuring stick to gauge the depth of the water.)
- During the summer, try pruning the out-of-control shoots every two weeks for more blooms.
Pruning Wisteria
- In the late winter, prune wisteria. Remove at least half of the growth from the previous year, leaving only a few buds on each stem.
- Also prune in the summer after customary flowering if you prefer a more formal appearance. On fresh growth, spurs from the main shoots of the wisteria develop its blossoms. Trim back every new shoot from this year to a spur, leaving no more than 6 inches of growth. So that there are no free, trailing shoots, the entire plant can be trained, roped in, and otherwise organized throughout this procedure.
- Mature plants that have been cultivated informally require little to no more pruning. However, for a plant that has been formally trained, side branches should be pruned back in the summer to 6 inches, then again in the winter to 3 buds.
- Possess you a fresh wisteria? After planting, aggressively prune the vine. Then, the next year, trim the main stem or stems to a height of 3 feet from the growth of the previous year. After the framework has grown to its full size, midsummer extension growth should be cut back to where it started that season.
Wisteria flourishes in Michigan?
I want to cultivate wisteria vine. Please provide your thoughts on the many species, including when they bloom, which ones have the nicest scents, etc. Are American species less hostile than Chinese ones? How aggressive is it, if at all? Will I prune on a weekly basis?
Chinese wisteria (Wisteria sinensis) and Japanese wisteria are the two alien species (Wisteria floribunda). Native American wisteria (Wisteria frutescens) thrives in the southeast of the country rather than in Michigan. The Japanese are more likely to be found here in the north since they can withstand temperatures as low as zone 4, despite being cold tolerant to zone 5.
The pea family plant wisteria climbs by twining its stems around any available supports. They have been known to destroy trellises, eat fences, and consume electrical poles. All three have a 25–30 foot height range.
With flower clusters up to a foot long that open before the leaves has grown, the Chinese is incredibly showy. Early to mid-May sees the emergence of the recognizable blue-violet blooms, which are relatively weakly perfumed. There is a fragrant white variety of the plant called W. sinensis called alba. After planting, Chinese wisteria may blossom three to four years later.
Japanese wisteria is a vindictive plant that blooms on aged wood in exquisite blue-violet blossoms from mid-April to May. Again, the cultivar you choose will affect the richness of aroma. The more flamboyant the blossom, the less fragrant it will often be. Significant fragrance is provided by “Macrobotrys” (reddish violet), “Naga Noda” (pale violet), and “Snow Showers” (white).
The American wisteria will produce 6-inch-long, pale lilac flowers from June to August on the growth of the current season if you have a bright and moist setting. Blossoms start to show up after the foliage has grown. According to Michael Dirr, a well-known author of woody plant books, it is a lovely plant in both leaf and flower, displaying more restraint than the Asiatic bullies. If you don’t have steel beams for support or one of the Asian species isn’t in bloom at the same time as the American species, you could want to combine them.
Whichever species you decide on, pick a named variety and plant it in a deep, wet, loamy soil that has a pH range of 6.0 to 7.0. A soil test will reveal the pH and whether or not amendments are required. The area needs at least 6 hours of sun per day. To enhance soil aeration and drainage, prepare a 2- to 3-foot diameter area for the trunk and add peat moss, compost, or aged manure. Wisteria can be encouraged to grow like a tree with a single trunk or let to climb a building. It must be supported by a sturdy arbor, pergola, or pole made of pressure-treated wood. Young plants should receive annual fertilization until they occupy the designated space. Look for vegetative growth instead of blossoms because fertilizing promotes it. Don’t fertilize after a plant has grown. Only water if the leaves begins to wilt. Too much water and fertilizer both promote green growth and reduce bloom yield.
Although not frequently, some trimming is necessary to preserve plant quality and encourage flowering. Just remember to choose one capable leader from each key framework branch. Just past the sixth or seventh complex leaf, cut off the ends of all new side shoots. Try this in the summer. Focus on at least halving the leader shoots’ length during the winter. Only one or two inches from their base, the cut side shoots.
To cultivate a wisteria of any type, you don’t need to be an expert pruner. The usual culprits behind the well-known annoyance of lack of bloom are excessive TLC, excessive fertilizer, excessive water use, and inadequate drainage.
Wisteria trees can endure the winter.
Wisteria (Wisteria spp.) plants have long pendants of fragrant purple or white flowers that dangle in a weeping manner. They are a favorite flower for climbing over arbors, training up a wall, or growing as a conventional tree. When grown, wisteria can readily withstand harsh winters and flourishes in U.S. Department of Agriculture plant hardiness zones 4 through 9. However, young wisteria plants might not be able to withstand the first winter after planting without some protection from frost and chilly winds.
In the fall, water the wisteria plant frequently to maintain moist but not soggy soil. The plants may move nutrients from the soil and store them for the winter by receiving regular watering in the fall. When freezing conditions are predicted, water plants liberally to prevent desiccation of the leaves when the temperatures cause the moisture inside to freeze, leaving frost on the leaves.
To protect the vine’s roots from the cold throughout the winter, cover the base with a 4-inch layer of organic mulch. Anything from crushed bark mulch to dried leaves can be used. To ensure the entire root ball is insulated, keep the mulch a few inches away from the vine and cover a space that is at least 2 feet in diameter.
Wrap the main stem of the wisteria plant with a section of thin-walled plastic tubing. With a razor knife, cut the tubing lengthwise, then pry it open to allow it to fit around the wisteria stem. The plastic tubing is less expensive than using frost cloth or leftover fabric, which are typically far larger than what is required for the stem.
Create a temporary walled enclosure to safeguard the plant. Using a reciprocating saw, extend four 2-by-2-inch wooden posts by about 24 inches beyond the height of the wisteria. Using a hammer, pound the four stakes about 18 inches into the ground. Place the stakes evenly spaced around the plant, 18 inches from the stem.
Frost cloth, burlap, or another type of fabric can be used to cover the stakes. Without letting air escape around the plant’s base, the cloth must be big enough to completely cover the structure. If you require more than one piece of cloth, make sure the ends are at least six inches apart. Set up some bricks or rocks on the ground to hold the extra length in place. The inside temperature of the building stays higher than the outside temperature thanks to the heat that is radiated from the ground surrounding the plant and is trapped by the frost cloth or fabric.
The ideal places for wisteria to grow.
According to Kirsten Coffen, a landscape architect and designer based in Maryland, “its gorgeous spring-blooming cascade of purple (or white) scented flowers is best observed when trained on a structure, such as a robust pergola.”
Such a lush, floral canopy offers delightful shade throughout the sweltering summer months. According to Irene Kalina-Jones, a landscape designer at Outside Space NYC (opens in new tab), “We plant it on rooftops in the city, training it to cover pergolas to create shade.” “But I enjoy it grown against buildings, too,” you say.
Wisteria grows best in full sun in a protected location, such as a south or west-facing facade. When planting, work in a lot of organic matter (such as compost) to ensure that the soil is rich and well-drained.
If you want to grow wisteria up a wall or the front of a house, put some effort into building a strong structure that it can climb over many years. A tensioning system of wires is possibly preferable to a wooden trellis because wood can rot. The wires must either automatically tighten as the plant gains weight or be simple for you to tighten (via turnbuckles, for instance).
Wisteria trees: do they thrive in the Midwest?
A show-stopping spring garden feature is lush wisteria covered with plump flowers. Read up on how to pick and train one before committing to this aggressive vine. Then you won’t have to deal with the problems that come with a pushy plant while you enjoy its delicious blooms.
What distinguishes a wisteria tree from a wisteria vine?
Do wisteria vines and trees differ from one another? I’ve been looking for a place to buy a tree because I’ve seen photographs. I’m always being pointed toward the vine, though. Any information would be helpful.
“Wisteria is a deciduous twining climber native to China, Japan, and eastern United States; there is no botanical distinction between a Wisteria vine and a Wisteria tree. British Royal Horticultural Society The training and trimming make a difference. The tree form is a wonderful choice for planting Wisteria in a smaller garden because it has a 30-foot growth potential and may be rather aggressive. These two websites demonstrate how to shape a wisteria vine into either the traditional or tree form. There is also a link to instructions on growing wisteria.
How resilient to cold is wisteria?
Wisteria vines can withstand a wide range of environmental factors, but the majority of types struggle in zones below USDA 4 to 5. Wisteria plants in Zone 3 were a bit of a pipe dream because these beloved plants of temperate climates often died during the cold, prolonged winters. Zones 3 to 9 are favorable for Kentucky wisteria, a chance hybrid that can be found in the swampy regions of south central United States from Louisiana and Texas north to Kentucky, Illinois, Missouri, and Oklahoma. In the cooler location, it even consistently produces flowers.
Japanese and Chinese wisteria are the two varieties grown most frequently. Chinese wisteria is appropriate down to zone 5, whereas Japanese wisteria is a little more hardy and thrives in zone 4. The Kentucky wisteria is descended from the American wisteria, Wisteria frutescens.
The plants naturally grow in highland thickets, riverbanks, and marshy woodlands. While Kentucky wisteria may flourish as low as zone 3, American wisteria is hardy only to zone 5. Wisteria can be grown well in zone 3 thanks to a number of novel cultivars that have been released. Compared to its Asian counterparts, Kentucky wisteria is less pushy and more well-mannered. Even after severe winters, it regularly blooms in the spring with slightly smaller flowers.
In USDA zone 3, Wisteria macrostachya, another plant, has also demonstrated its dependability. It is marketed under the name “Summer Cascade.”
The best wisteria vines for zone 3 are Kentucky wisteria plants. Even a few cultivars are available for selection.
A Minnesotan cultivar named “Blue Moon” sports tiny, fragrant clusters of periwinkle blue flowers. In June, vines can reach lengths of 15 to 25 feet and bear racemes of fragrant, pea-like blooms that are 6 to 12 inches long. These zone 3 wisteria bushes then develop 4–5 inch long, velvety, soft pods. The plant’s delicate, pinnate, dark green leaves on twining stalks only add to its allure.
The aforementioned “Summer Cascade” has racemes of delicate lavender blooms that are 10 to 12 inches long. Other varieties include “Clara Mack,” which has white blooms, and “Aunt Dee,” which has lovely antique lilac flowers.