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Powdery mildew on acanthusHi goyers


By Sarahm

United Kingdom Gb

Powdery mildew on acanthus
Hi goyers, seeking your advice...the acanthus plants in my garden are on clay soil and have developed powdery mildew, should I spray the leaves or do I need to cut right back to avoid risk of spreading to nearby roses and rhodendron ? Thanks



Mildew is usually associated with dryness at the roots, so give the plants a good soaking.

2 Jul, 2015


Agree with answer above, but it won't hurt to spray with 1 part milk to 9 parts water as well, cows milk that is. Sounds daft, but it works against powdery mildew.

2 Jul, 2015


Shouldn't affect your rhododendron

2 Jul, 2015


Thanks all and intrigued by the milk/water mix, will need to try it!

2 Jul, 2015

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