Wally in Toronto, Ontario, asks: When I bring my rosemary plants into the house for the winter, they get a powdery mildew that kills new growth. How do I treat this? Beckie’s reply: Good air circulation is important to prevent or at least control powdery mildew. Don’t crowd your rosemaries with other houseplants and keep them away from humid locations. Consider directing a … [Read more...] about How to treat powdery mildew on rosemary?
This summer has been considerably more comfortable, unlike the past several years with six to eight weeks of hot, dry weather that stressed me as well as my plants. There has been enough rain, allowing me to relax a bit from the daily watering ritual. Plants have grown well, but so have the spores of moisture-dependent seasonal mildews. Mildew spores are active in late summer … [Read more...] about Mildew-resistant lilacs