Mildew-resistant lilacs

Judith Adam

Dealing with powdery mildew on lilacs can require replacing them with mildew-resistant cultivars. Mildew spores are active in late summer.

'Katherine' phlox (Photo by Garden Making)

Dealing with mildew on phlox

Judith Adam

Drenching rains can cause an early onset of mildew on phlox. These scented, long-blooming perennials are one of the backbones of summer gardens.

Fortunately, New Guinea impatiens is resistant to downy mildew.  (Photo from

Monitoring downy mildew on impatiens

Judith Adam

The vivid colours and generous floral displays of impatiens are hard to resist. Unfortunately, you need to be monitoring downy mildew on impatiens.