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Why are my wisteria leaves yellowing

I bought a young wisteria from a garden centre and potted it out of its tiny container to a larger pot. I've noticed the last few days that some of the leaves are speckled yellow. They seem perhaps to be the older leaves and the smaller leaves at the top of the plant are green.

Is there some kind of deficiency? When I potted it I put some fish, blood and bone meal in it and I haven't over watered it.

Any help would be gratefully received. 

Thank you 


  • ObelixxObelixx Vendée, Western FrancePosts: 28,030
    It could be powdery mildew which actually doesn't show the usual white powder on wisteria - according to the RHS who advise you make sure your wisteria is well ventilated so air can circulate and try overhead watering mid morning to wash it off.

    "Overhead watering (in mid-morning) in dry weather can reduce powdery mildew (which does not like direct contact with water). Avoid leaves remaining wet for long as this may favour other diseases"

    If you don't mind chemicals, try a fungicidal spray but follow the instructions carefully..
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • Thank you for your reply. The wisteria is out on the decking presently so it should be well ventilated. 

    I'll try showering it tomorrow but if that doesn't work I'll have a go at a fungicide. 

    Thanks again
  • Hostafan1Hostafan1 Posts: 32,338
    I'd suggest it'd be better / happier NOT in that pot and planted in the ground.
    They're BIG plants with BIG root systems.
  • I do plan to plant it out but we are planting it on the front of the house and it is a very young plant still - it's probably 3ft high. The pot it came in was tiny and the pot it's in just now is much much bigger.
    We planned to plant it out when it was a bit larger? 
  • ObelixxObelixx Vendée, Western FrancePosts: 28,030
    I have one much bigger than that in a 45cm pot waiting for its planting space so as long as yours is fed and watered adequately it should be fine for a while but it really would be best to plant it out if you can.    

    While it's small it will need protecting from drought and extreme cold but they do grow to be very strong plants if you give them fertile well drained soil.  Easier to train onto ts wires or trellis when young too.
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • I'm kind of torn as to where to plant it. We want to plant it at the front of the house but it's north east facing and gets get direct sunshine either end if the day but I've read that's not suitable for a wisteria?

    I have mixed some miracle grow for it and I'm going to try showering it. If no good or it spreads then ill get a fungicide. 
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