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Penstemon with mildew?

I have a well established penstemon (not sure of name but is low growing, spreads well and has beautiful blue flowers) anyway....I pruned it this spring and it's put on a lot of growth with plenty of flower spikes but has what looks like a bad attack of mildew and deeper into the plant is a lot of dried brown foliage!
Anyone come across this before and more importantly, anyone got any tips on what will clear it up if possible please?



Posts

  • LynLyn DevonPosts: 20,597
    Did you cut it right back to the ground?
    Gardening on the wild, windy west side of Dartmoor. 

  • BettyWalesBettyWales Posts: 47
    No I didn't but it did have quite a good chop down to new growth. Is this maybe where I went wrong?
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