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Clematis flowering problems

Hi Everyone.  This is my first posting on the site. I have two group 3 clematis which are growing in pots; I bought them about 18 months ago.  I have cut them back in Feb to around 12 inches but when I planted them I didn't plant them deeply so I'm afraid that's the reason I'm only getting flowers at the top of the plant.  I'm planning on repotting them this year; does anyone know whether I can plant them deeply now, or can this only be done to new plants? Thanks for your help

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  • Matty2Matty2 Posts: 4,817

    I ave read that when you cut them back you should cut stems at differnet levels to get flowers all the way up. They should be plated with at least 3ins of soil on top so I guess as you are re=planting them you could do that. Secret is to plant as deep as you can if in a pot.

  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 11,391

    Some group 3 do grow and flower this way and there's not much you can do.  Having the pot in full sun will help, as will feeding with a low nitrogen, high potash fertiliser and pruning any really vigourous shoots to a pair of leaves during the growing season (which will keep it from growing too tall.)  I have a viticella 'blue belle' which doesn't get much direct sun until later in the season and that never flowers below 2m even though it is cut nearly to the ground each year.  All the other group 3s I have (dozens of 'em) usually produce flower from 1m upwards.  As Rosa said, you can try not cutting back some of the stems so hard in early spring, if they are showing live buds.  These buds may then produce flowers earlier in the year.  Most large-flowering clematis can be grown as group 2 or 3, depending on how you prune them.  The pruning groups 2 & 3 aren't set in stone and are only given as a guide to how each cultivar is 'normally' grown.  This became clear to me years ago when I kept finding the same cultivars classified differently, depending on which book I looked in, and that knowledge has helped to get the best out of my collection.

    A trowel in the hand is worth a thousand lost under a bush.
  • Leigh2Leigh2 Posts: 5
    Thanks very much for the advice, I found it all really helpful.
  • Bunny ...Bunny ... Posts: 3,471
    I have one with sm leaves which has never flowered, however in my """I'm carol Klein lets take cuttings stage""" one of my cuttings flowered in the greenhouse and not sure why main plant hasn't , I don't know if I need to cut back , leave or what ....hmmmm.
  • DovefromaboveDovefromabove Central Norfolk UKPosts: 82,102

    Does it get more light in the greenhouse than in the garden - or - are you not recognising the flowering shoots and pruning them all off and turning them into cuttings image

    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • Bunny ...Bunny ... Posts: 3,471
    Errrr it possibly gets more sun, currently on pergola facing south east , gets early sun beore hidden by house bit shady perhaps ? though that area is in sun it's on other side of trellis. I have never chopped at it before , been in few years only took bits of last yr . I should take a pic and where it is and look for sun ...when it is sunny .
  • Busy-LizzieBusy-Lizzie Posts: 20,369

    Leigh, you can plant them more deeply when you repot them. They really do need it to help prevent clematis wilt and to keep the roots cooler. As they are in pots have they been fed and watered enough? I find mine in pots need a really good soak every 2 or 3 days, rather than little and often.  Like the garden ones prefer a weekly soak, when the weather is dry. 

    Dordogne and Norfolk
  • Leigh2Leigh2 Posts: 5
    Thanks Busy-Lizzie. Yes I've fed them on top rose and I do water them well. Would you suggest giving them a general purpose feed at the time of repotting or will that be too much?
  • Busy-LizzieBusy-Lizzie Posts: 20,369

    Not just yet, they will have the new compost. They will need it as the new growth starts. It's still winter.

    Dordogne and Norfolk
  • I have two bowl shaped pots about 45cm dia in each are 3 Clematis of different types. When I planted these I had no idea what I was doing, totally green. 4 years on and a prune down each year up they come. I have a 2m obelisk's on each and start to wind them from the base up when they start to sprout, I can get only a few flowers to come out at the base, all start at the 1+m height. My other Clematis (43 last count) all start flowering from 1+m height.

    I use the space at the base now to grow other plants.

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