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How do I get rid of the white powder please?

Powdery mildew, caused by dryness at the roots usually.  It will die down soon and the leaves drop off anyway. Next year, water more.

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  • DovefromaboveDovefromabove Central Norfolk UKPosts: 73,709

    You won't get rid of it now - the plants will start to go over very soon as the weather cools and that'll be it until next year. 

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







  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 11,194

    Mildew won't infect the tuber Aym, so it will be ok whne dried off for the winter and planted next year.

    A trowel in the hand is worth a thousand lost under a bush.
  • DovefromaboveDovefromabove Central Norfolk UKPosts: 73,709

    Powdery mildew attacks plants which are susceptible because they've been weakened by something in the past - the most common cause is that they've been too dry at the roots.

    The best way to avoid this happening in the future is to give each plant the optimum conditions for its needs - easier said than done and sometimes weather and soil conditions conspire against us.

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







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