Powdery mildew dramas... don’t know what to do?
Hi all, I have 4 large borders which are new this year but several of my plants in one East/North East border appear to have been struck down by powdery mildew (centaurea montana Jordy and Alba, lupinus West C Masterpiece and Sanguisorba Tanna) other plants in the border seem fine - the affected plants are all spread out and not near each other. I have cleared around them and removed affected leaves but what else can I do? Is it possible that we have a source somewhere nearby that will keep reinforcing them? I recall losing all my beans and peas about 4 years ago to it (in a different part of the garden) and haven’t tried to grow them again since - but I have some in this year so 🤞. Would I be better to pull out all affected plants and replace with resistant ones? (Any suggestions for resistant plants?). I didn’t even think the Sanguisorba Tanna was susceptible 🤷🏻♀️ Bit worried - I’m new to gardening but have taken on a massive project relandscaping our garden, aside from the really bad soil (clay, and a vast amount of hardcore and builders rubble - which has been an epic effort to try and correct) this is my first major hiccough. Advice would be very much appreciated. Thank you