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My Akebia does not look well at all

Hello Gardeners,
I hope you can help with my akebia, it does not look well at all and it seems it has multiple issues. I am actually considering getting rid of it unless someone on here will kindly give me some tips. I cannot find anything about akebia diseases that would resemble what my plant has got (the purple spots). 
I bought the akebia last year to cover an east facing wall after reading that it’s a vigorous climber and quite resistant to diseases, and that it would be quite happy facing east. It is growing in a container in a courtyard as there is no soil by that wall. 
As the year has progressed I have noticed a few issues:
- it has purple spots on leaves, they were present already when I bought the plant (not purchased online) ; as the plant matures, more and more leaves seem to be covered in these;
- the leaves are not fully green, but are yellowing — I think it is suffering from some form of mildew as well as possibly from some nutrient deficiency
- the stems and leaves have a white film. I sprayed it in spring with a provanto fungicide for mildew and it seemed to have curbed the spread, but the discoloured leaves and the purple spots do not indicate that the plant is healthy at all as you can see in the pictures below. 
I planted it in a multi-purpose compost with drainage and have maybe fertilised it with miracle gro twice or so.
The spring was very wet and cold until the end of May here and the weather has greatly improved now, although I don’t know if the weather has got anything to do with it. 
I would be very grateful for any suggestions. Thank you

Posts

  • ButtercupdaysButtercupdays Posts: 4,546
    MPC has not got what it takes to support a shrub that you are expecting to climb a wall :) It needs to be replanted with John Innes No. 3, with just a little MPC added to lighten it, preferably in a somewhat larger pot if you can. A foliar spray with liquid seaweed may help remedy any nutrient deficiencies, and keep it well watered. Mildew often strikes when plants are too dry.
  • Lizzie27Lizzie27 Posts: 12,494
    I agree with Buttercupdays. Akebia is a very vigorous climber and I'm not sure it would survive long in a pot. It would need one at least half-barrel size and would want constant watering. 
    North East Somerset - Clay soil over limestone
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