Category Archives: vines

pruning wisteria, vines, winter pruning, wisteria

Wisteria – Growing Tips & Maintenance

A pink Chinese wisteria covering a pergola in Bonny Doon

Wisteria season is winding down unless you have a repeat bloomer like a ? Cooke?s Purple? or ?Amethyst Falls?. I?ve heard it all: ?Why doesn?t my wisteria bloom?? or ?I planted a wisteria in the wrong place, how do I get rid of it?? or ?I love my wisteria but it?s taking over the porch ?? (insert garage, house, shed or other structure) Seems we either love ?em or hate ?em on our own property. Growing somewhere else they are always the stars of the spring garden. If any of this sounds familiar to you here are some tips on how to handle yours.

Wisteria are one of nature?s most resilient survivors. They are able to withstand and recover quickly from difficult conditions. To some they are a little too tough for their own good with a growth rate rivaling bamboo during the summer. If you dream of a wisteria-covered pergola shading your patio here are some maintenance tips that are sure to keep both gardener and vine happy.

A pink wisteria growing under a fragrant purple variety covers a gazebo.

Wisteria are so vigorous they can be pruned at any time, keeping them in bounds and clearing out unwanted or dead growth. Prune out any stems you see extending into eaves, windows or shingles. If yours has gotten away from you, you can even prune it down to the ground and start over with training although you?ll have to wait a few years for your vine to bloom again.

To their control size major pruning is done during the dormant season. Start by trimming the long tendrils that grew over the summer back to about 6 inches from the main trunk. Cutting the tendrils back in this way will initiate flower bud development, neaten the plant up, and show off the attractive trusty, gnarly character of the vines.

Whatever time you do renovation pruning remember the response of the wisteria to aggressive pruning is to literally explode with new runners. They put energy into new vegetative growth at the expense of flowering. Make sure you keep up on ongoing maintenance pruning by removing all unwanted runners right to their point of origin. Then prune back the others to 3 buds or sets of leaves. Repeated pruning of these runners is what will eventually give you spurs of wood, short laterals that in turn will provide you with flower clusters. You need to prune these runners all season long which ends up being every 3-4 weeks.

Do not fertilize your wisteria. They do not flower well if there is an over abundance of luxuriant growth. Over feeding also ends up giving them the means to become unmanageable monster. If you have trouble getting your vine to flower an application of a high phosphorus fertilizer may promote blooming.

A diligently pruned wisteria at Filoli Garden

Maintaining a wisteria requires some diligence but the reward is worth the effort. Remember this especially during winter pruning season to make summer maintenance easier. If you find that the wisteria vine has invaded a nearby bed, cut roots with a shovel below the soil line to control any that have wandered.

Which variety of wisteria should you get to cover your arbor, pergola, tree or other structure?

A Cooke’s Purple wisteria growing on a pergola in Boulder Creek.

Chinese varieties such at ?Cooke?s Special? have clusters of fragrant blue-purple flowers 20 inches long. This variety can re-bloom which makes it a favorite. Chinese wisteria can take up to 20 years to mature enough to produce flowers, but once it has matured, the plant is very long lived and can live up to 100 years.

Japanese wisteria like ?Caroline? bloom early with mauve flowers. ?Royal Purple?. known also as ?Black Dragon? , has sweetly scented dark purple flowers. Japanese wisteria are most effective when grown on pergolas so their long flower cluster can hang freely.

American wisteria, native to more eastern areas of the U.S. is a smaller, less invasive species that grows ar about a third the rate of Asian wisteria. ?Amethyst Falls? blooms at an early age with lightly fragrant purple racemes. Use in containers for porch or patio, train up an arbor or trellis or as a small free-standing tree.

Silky varieties produce a profusion of short, 6 inch, fat clusters of strongly scented flowers that open all at once. They have velvety seed pods and bloom best in full sun.

All parts of the wisteria vine contain a toxin known as wisterin which can cause stomach upset. Growers should also be wary of pets and children eating the flowers or seed pods.

Early spring bloomers, flowering shrubs, Flowering trees, fragrant landscape plants, fragrant plants, vines

Just a Few of the Plants Blooming Now

Fragrant Blireiana flowering plum

Some years plants bloom a couple weeks earlier than usual but not this year. Our February weather put many plants on hold. Nature?s catching up now. Outside my window the Blireiana flowering plum is covered with dark pink, double blossoms. It’s one of my favorite spring blooming trees with a sweet fragrance strong enough to scent the garden. It usually blooms in February in time for my birthday but not this year. Worth the wait. We all look forward to the earliest flowers of the new season. Spring officially began on March 20th.

Forsythia

The cold and rainy weather didn?t stop an old fashioned shrub like forsythia from blooming. They figure prominently in many old gardens because they are tough plants, able to survive neglect and still look beautiful. The bare stems of forsythia are completely covered with deep golden-yellow flowers in late winter and early spring and become the focal point of the landscape when in full bloom. The showy stems of this easy care shrub are great for cutting. Forsythias are native to eastern Asia but a chance discovery in Germany by a grower who specialized in breeding for the cut flower industry led to the especially vivid variety ?Kolgold? in the 1800’s. Forsythia has long been used in Chinese medicine. The flower petals contain powerful bacteria-fighting properties which make it an important dressing.

Flowering quince

Flowering quince is another old garden staple providing early color. They are easy to care for and nearly indestructible in almost any soil that is well drained and not overly fertile. Once established quince is a very drought tolerant plant and their spiny branches make them an excellent choice for hedges, screening or as a security barrier. There are red, pink, orange and white flowering varieties. The Toyo Nishiki cultivar even has pink, white and solid red flowers all on the same branch.

Yellow clivia

Buds are just starting to form on my clivia or Kaffir Lily. What would a shade garden be without a bright orange clivia? Every year I look forward to their huge flower clusters that emerge from between dark green, strappy leaves. Even in dark shade they will bloom and brighten the late winter/early spring garden although they would do fine in morning sun. If you have a north facing window you can grow them as houseplants. Clivias are hardy to several degrees below freezing. I have a yellow flowering variety also but I?m not seeing any buds forming yet. Possibly it?s too young. Clivie bloom best when crowded.

Hardenbergia ‘Happy Wanderer’

A beautiful vine that blooms at this time of year is hardenbergia ‘Happy Wanderer’. In the pea family, this evergreen vine looks like a small wisteria when in bloom. Pinkish-purple flowers cascade in clusters on twining stems that reach 12-16 feet long. They require little water once established and are hardy to about 23 degrees. If you have an older, tangled plant you can rejuvenate it with hard pruning in early spring after flowering. Never prune in late summer or fall because you will cut off the wood that is going to bloom the following winter.

The last plant I couldn’t live without is Fragrant Sarcococca. The tiny white flowers of this plant are easily overlooked but you can’t miss their scent. I have one near the front door that greets me with that vanilla fragrance every time I walk in or out. The flowers are followed by a bright red fruit. Sweet Box forms a natural espalier against a wall and if you have a problem spot in deep dry shade where other plants won?t grow give this plant a try. They are easy to grow, deer resistant and trouble free.

Deer Resistant Plants, flowering shrubs, Flowering trees, green design, vines

The Hillbilly Gardener of Scotts Valley

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anemone_clematis_vineThe self -described "Hillbilly Gardener" lives In the banana belt above Scotts Valley Civic Center. Technically, Richard Hencke says he is 1/4 German, 1/4 irish, and 1/2 hillbilly from his childhood in Texas and Oklahoma. A true gardener at heart, Richard spends much of his time as an emergency room doctor at a local hospital and the rest of his time tending his garden. With trees and plants collected in his early  days as a Boy Scout in Port Arthur, Texas, as well as plants acquired from the far corners of the earth he has created a spectacular landscape surrounding his home. "They'll carry me out of this property in a pine box", Richard says. He clearly loves his personal arboretum.

On a clear spring day recently, Richard gave me the royal tour. I visited this garden 2 years ago and I couldn't help but be impressed with incredible growth he has coaxed from his many blooming trees, conifers and vines.
The Pride of Madeira spikes glowed in the sun, some cobalt blue, others vivid purple. Early spring blooming shrubs and perennials offered color at every turn.

One of his passions is allowing flowering vines that grow up into the canopy of his trees which adds one more dimension to his landscaping. A Blood Red trumpet vine is happily inching up a redwood trunk while a butter yellow rosa banksia scrambles into an oak. On a fence along a walk a spectacular blooming double white pandorea vine has found a home in a Butternut tree he got in Pennsylvania. A rose colored anemone clematis nearly covered the trunk and branches of a dormant catalpa.

Fragrance and color as well as good "bones" or structure make Richard's garden breathtaking. He nurtures each seedling with the same care he gives to the large trees. I laughed as he pointed out a 15 ft tall aralia elata that was transplanted from a tiny dish garden received many years ago as a gift. One of his favorite trees is a white pine gleaned from his grandmother's place in the Blue Ridge Mountains in Virginia. A black cottonwood he picked up in New England, 2 maples hail from New Orleans and the sisal agave grew from tiny pups he found at a rest stop on Hwy 280 in case he ever wants to make rope or twine.

Richard likes to naturalize Hawaiian native plants starting them mostly from seed collected while on vacation. He has several Sacred Koa or A'ali'i growing on the property. Since this dodonaea species grows at 5000 ft elevation up Moana Loa they have adapted nicely to his Scotts Valley climate. I wouldn't be surprised if Richard goes into the canoe or lei making business when his trees grow up.

A small portion of Richard's garden is fenced but most is open to the deer. So far the branches growing eutaxia_obovatathrough the fence of his bright golden pea-like Eutaxia obovata have not attracted them. Also known as Egg and Bacon shrub this plant is a compact shrub originating from Western Australia. It's graceful fountain shape really shows off the thousands of flowers adorning the branches.

Like all devoted gardeners, Richard likes to share plants with others. A couple of years ago he sent me home with one of his F-2 hybrid Douglas iris and this year a dendrobium orchid. I'm hoping more of his cuttings of the Sacred Flower of the Andes ( Cantua ) take and maybe I'll be lucky to get one of these, too. A day in Richard's garden is always a magical experience.