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Growing Clematis

CLEMATIS
Rumor has it that clematis vine is difficult to grow. Given the right location and a little know-how clematis is a relatively easy vine to grow which will reward you with a beautiful splash of color when in bloom. Clematis is grown in many parts of the world and comes in a rainbow of colors and unusual shapes and sizes.

clematis
Culture
Since they like cool, moist roots and their heads in the sun, plant them in full sun or filtered shade in a rich organic, well-drained soil with a ph around 7.0. Dig a hole that is 18″ deep and 18″ wide. It should be large enough to set the crown 2-2 1/2 inches deeper than its original container. This will help promote good root development and a stockier plant. Add organic material or compost to enrich the soil. Clematis can be planted with shallow rooted companion plants (annuals & perennials) so that they can shade/mulch the roots during the hot summer months. Water deeply and regularly during the growing season especially in hot weather to maintain moist roots. Clematis are heavy feeders, fertilize in early spring when buds are 2 inches long then every 4-6 weeks with a rose food except when flowering. Be sure to provide some kind of support for the vines to grow and climb on.

Pruning
It is important to prune Clematis to keep it in bloom. Different types of Clematis have different pruning times. If your clematis flowers before end of June, it blooms on old wood (last year’s growth) don’t prune in the spring, cut out only dead stems to the highest new leaf axils, just above a pair of swollen fuzzy buds. Prune early bloomers after flowering. Remove dead flowers and cut the length of the stems to force new growth. For late bloomers, those that bloom on new wood (current year’s growth) prune in early spring before new growth starts and cut vines 6-12 inches above the ground to encourage vigorous new growth and continuous flowering throughout the season.

sweet autumn clematis
All new plants should be pruned hard to 12-18″ the first spring after planting to establish good base growth.
When you plant a Clematis be sure to note what variety it is so that you’ll know when to prune it.

Sources: Chicagoland Gardening Mag.

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18 comments to Growing Clematis

  • Kris

    Last fall I planted two sweet autum clematis. They grew to about 2 foot tall and have stopped. The planting spot is sunny, I have watered and fed. What should I do to get these vines to grow and flower? Thanks!

    Sweet autumn clematis prefer to have their feet in the shade and the foliage in the sun. They usually grow like a weed when conditions are right. You may need to transplant it to a new spot where the roots stay cool during the growing season eg: at the base of a tree, even a shade of a rock. Plant it in well- drained soil. A layer of mulch will help keep the soil cool and moist. Prune back last years growth 6-12 inches above the ground in the spring this will encourage a bushier and healthier vine . Unlike other clematis, “Sweet Autmn” blooms on the current season’s wood so you don’t have to worry about pruning at the wrong time.

  • Theresa

    8-21-06

    I have a question about my clematis vine. The flowers are little pinkish/purple ones but there are these huge pod-like green things growing too, what are they? Theresa

    If the pod-like green things look like a furry ball with silky tails radiating from the center then it is the seeds head that is produced after the flower is done blooming. If not it may be some other vine seed pod that has chosen to join your clematis. Kris

  • JoAnne Folsom

    Kris, I have a question about our clematis. We live in WA state and it’s about 3 years old now and does great. Only thing the leaves seem to turn brown too fast, like when the flowers are in bloom. It is planted deep, but I am wondering am I not watering it deep enough? I do use Miracle grow on it, is this wrong?
    It is growing good now, but just starting to spread out.
    Thanks! JoAnne

    Hi JoAnne,

    It’s possible that you are not watering it deep enough. During the hot summer, clematis need to be watered regularly and deeply but at the same time make sure the soil drains well and doesn’t stay too wet or it will cause a fungal disease (wilt). Mulch the plant to keep the roots cool and moist during the summer.Miracle grow is fine

  • Diane Parks

    In you web-site you mentioned fertilizing with a Rose food. I feed all of my roses 10-20-10 and want to know if this is okay for my Clematis and how much.

    Diane

    Your rose fertilizer should be fine as long as the first number(Nitrogen) is low. Feed your clematis every 4 weeks. Stop feeding when the plant sets buds, resume after flowering. Also discontinue feeding in early August to get it ready for the winter. Use the same amount recommended for the roses.

  • cheryllong

    I live at Fargo, North Dakota how do I prepare my clematis for the winter months? Do I cut it back or just cover the roots well? Thank you Cheryl Long

    You can mulch the roots especially if it is a new plant that isn’t as established as a mature vine. Mulching will provide some insulation and protection from fluctuating winter temperatures. Any pruning if it hasn’t been done by now should be done in winter or early spring. You need to determine what time of year your clematis blooms in order to prune. See above article.

  • Cheryl

    Are you supposed to deadhead an spring to fall blooming Clematis?

    If you have a young plant you may want to pinch off the spent flowers to keep them from producing seedheads. Seed production drains a lot of energy from a young plant. By cutting off the seedhead you can get more flowers and sometimes (depending on the variety) a second smaller blooming later in the season. If you have an older established clematis, then deadheading is not necessary unless you find the seedhead unattractive .More info on deadheading

  • Reba Adams

    2007-10-23 Reba Adams
    I have a clematis that is planted in a bed next to our concrete drive-way. It blooms once in the early spring, and then nothing. The vine turns brown. It does have sun most of the afternoon. What do I need to do to have a healthy plant all summer?

    The location may be the problem. A concrete driveway and afternoon sun can get pretty hot in the summer. Clematis like their roots to be cool and shaded. Try

    mulching it and make sure it gets enough water.

  • Kay Boll

    I have a Clematis ‘Vanso’, planted it last spring. Don’t know if I should prune it back this spring. There are already signs of budding on the old vine and new growth coming from the ground.

    Hi Kay
    Your clematis ‘Vanso’ belongs to group 2 for pruning technique. This means it blooms on old wood (last year’s growth). Prune in late winter/e. spring down to 20 inches the first year and 30″ the second year. This will help establish a good growing base for future growth. After that just prune in early spring to shape the plant if it gets too big (cut back last yr’s growth up to 12″) and remove any dead material that is above swollen buds. Hope this helps.

  • Sheila Horspool

    I have a large blooming clematis that produces the flowers right on the vine without a stem for the flower. Also the first few flowers were right at ground level. The flower was the first thing showing, with no vine in sight. Is this normal? I pinched off the flower on the ground to encourage the vine.

    I have not seen this type of blooming but there are many types of clematis. Perhaps the vine was partly buried and only the flower showed. Pinching it was a good idea but now wait and see what happens.

  • Brenda

    I live in TX (ie. . . very hot summers) and am trying to figure out a way to shade the west side of my house, especially the door, to help reduce air conditioning cost. Plans are to build a arbor/trellis over door and cover with vines. Would a clematis do here? Wondering if the hot afternoon and evening sun would be too much considering they like their roots cool. Any other suggestions would be appreciated. I really need a fast grower and I realize clematis isn’t going to be that fast, but I do love the looks of them. Oh, I have planted tall sunflowers about 8 feet from the door, as of tonight they are about 1inch tall. (It may take awhile.) Help me solve this please. And Thanks!

    Hi Brenda
    Clematis will work, you need to provide some shade to the roots by planting low growing plants in front of the the vine to keep it cool. Other vines you may look into are Crossvine (Bignonia capreslata), Carolina coralbead (Cocculus carolina) and Trumpet honeysuckle (Lonicera semipervirens). Go to http://www.wildflower.org/explore/ Lady Bird Johnson wildflower center, it has lots of great info.

  • M. Powell

    Clematis wilt
    My clematis are in bad shape. In the height of bloom, the flowers and leaves looked as if they had been srayed with something toxic. Brown splattered looking spots appeared and the plants are in decline. Buds that were forming wilted and died. Leaves appear to be drying though the soil is moist. Helebores planted at the feet of the vines are doing great. Maybe a fungus? Plants are only a few years old and not well established, though they did extremely well for the past two seasons. Should I cut them to the ground? This blog is extremely helpful to me. Thank you so much for sharing your knowledge and advice.

    It sounds like a leaf spot and stem rot caused by a fungus (Ascochyta clematidina) also referred to the infamous clematis wilt. Wilting and drooping of new growth is an early sign of infection eventually the fungus will extend to the stems causing them to turn black and die. It occurs during cool damp weather and just when it starts to bloom. Avoid overwatering the soil and water only when the soil is dry esp. in summer.Keep mulch away from the stem. Prune and remove the diseased leaves and stems. Clean the shears with alcohol after each cutting and do not compost the clippings. You can try preventative fungicide (sulfur) spray approved for clematis early in the growing season(next year) before the disease starts. The disease does not kill the roots or the whole plant but parts of it. The plant will send out new growth from the roots. There are some new hybrids that are more resistant to Clematis wilt.

  • kathy

    Clematis wilt
    my marie louise clematis was given to me last year i thought it was dead but i pot planted it & this year it came back it was doing quite well i had it in direct sun then in a matter of a day or two it died what would have caused that? could it have been to much sun?

    Hi Kathy
    If the leaves turned completely brown and the whole stem died, then it could have been caused by a fungal disease called “clematis wilt” which occurs when the plant is actively growing. Remove any dead material. Sometimes the plant will recover so wait and see if the roots will send out new growth before removing the plant. Clematis like their heads in the sun but the roots shaded.

  • Lisa

    Hi, I just planted an overgrown Sweet Autumn Clematis by my mailbox that I bought on discount at the nursery. I pruned it down to about 3 feet, but I’m wondering if I should prune it harder. Also, this clematis will be the anchor of my ‘mailbox garden’. Can you suggest any good companion plants for a 4′x4′ area? Thanks so much!

    Hi Lisa
    Don’t prune off anymore or you will loose some flowers in the fall. Sweet Autumn blooms on current season’s growth so what you have will produce flowers. It’s best to cut it back down to 6-12 inches in the spring. You can add some shallow rooted plants such as vinca ground cover in front of the vine to keep the roots cool.

  • Suzanne

    I was given several different Clematis as house warming gifts. I have never grown these plants and am apparently dioing something wrong. I have them planted in pots but there has been no new growth. I fertilize with Rose food, water every other day, 8 hrs of sun daily with roots covered. I have tried moving them around about once per month for the last 4 months .. but no new growth … any suggestions?

  • Joann Poyner

    Clematis wilt
    I inherited a Clematis of unknown name when I rented this apartment a little over a year ago. The first season it bloomed very little. This year it bloomed a little better, but from the advice I have read here, I believe it has clematis wilt because lower parts of the stem will turn brown and dead looking while the top of the stem is green and maybe blooming. Can I cut it back to the ground this fall and start over with new growth in the spring. It is a lilac color and blooms in May and then again later. I want to save it if I can before trashing it and buying something else. I was told it did very well for the previous owner.

    Hi Joann
    If your clematis had clematis wilt the leaves and shoot tips would droop, wilt and the stems would eventually turn black. At any rate cut out the diseases stems. I’m not sure which clematis you have.
    It can get confusing. If the vine is diseased prune it back to the ground. It should start over in the spring. Make a note if you get flowers that year or not as that will be a good indicator as to what type of pruning group your clematis belongs to. Vines belonging to Group 3 or C are clematis that flowers continuously on new growth, these can be cut back severely in spring to the lowest pair of healthy swelling buds. Unpruned vines usually develop low bare stems and flower at the top of the plant-which sounds like what you may have.

  • Liz

    I have a 15 year old hardy Kiwi plant which had become so overgrown and viney that it had to be pruned way back two weeks ago before any new growth appeared. The cut stems are still dripping sap continuosly. A yellow fungus type growth has developed around the cut areas.

    1. Should I have sealed the cut ends with something?
    2. What is the yellow growth and what do I do about it.
    3. Will the plant still live?
    4. Should kiwi plants be fed anything or pruned in a special way to encourage fruit?

  • deb

    I have a marie louise clematis. This year all the petals did not open. Had many buds and blooms and then all the leaves turned brown and crispy. Had a very wet spring. Also should I cut it back now that is is finished blooming and looks dried up?? Tnanks deb

    Hi Deb
    If the leaves turned completely brown and the whole stem died, then it could have been caused by a fungal disease called “clematis wilt” which occurs when the plant is actively growing. Remove any dead material. Sometimes the plant will recover so wait and see if the roots will send out new growth before removing the plant. see above comments on Clematis wilt.

  • My.Scottie

    Hi everybody, I am confused. I can’t diagnose what is ailing my numerous clematis’(or is plural clemati?). It sounds suspiciously like it is clematis wilt, but the symptoms for too dry a site also can cause the same, but with the leaves turning black not brown?!*!? My thoughts are to put a wooden doweling into the soil beside the plants and then I can tell how wet the soil actually is. Does anyone have any suggestions the can be more conclusive or any suggestions on how I should proceed. It started with my Josephine, which was moved last year, and now seems to be affecting them all, from Princess Di to the Multi Blue and Nelly Moser. Also this year in Toronto I have an infestation of aphids which have moved from my lupines to my Roses and now it the younger clematis’. I have been spraying with a dish soap and water solution daily. HELP!!!!!

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