Tag Archives: Powdery mildew

Coreopsis disease

Hi, I had planted native plant Coreopsis lanceolata this spring. It developed some disease so the leaves became kind of gray/white. The new growth did not have that color, but most of the leaves did. It still bloomed well. Is…

Powdery mildew on Hydrangea

Hi. I am a beginner in gardening. I recently purchased the hydrangea in the picture, and some white powder-like markings appear on its leaves. I suspect that those are mildew, and had used Safer’s 3 in 1 Garden Spray Fungicide…

Powdery Mildew on potted indoor Rosemary plant

Good morning. I live in Toronto and have a 3-4 year old potted rosemary that I have been successfully overwintering indoors. Right now though, it is rapidly getting overcome by powdery mildew- worse at the top- and it needs immediate…

Damaged serviceberry branch

Hello – Thank you for reading my question. I was hoping for your advice regarding this Downy serviceberry branch that I realize we should have wrapped when it was first damaged during some construction. It’s now a black gash and…

Autumn Joy stonecrop leaves turning white

I bought 4 small Autumn Joy plants, 2 of which I planted in the ground. The 2 in pots have a white splotchiness on the leaves. What is this and what shroud I do about it?…

powdery mildew on peonies *

I have several peonies. Several, but not all, are covered with white mildew. Will this weaken/kill the plant. What can I do to prevent this. I have cut off the deceased stalks and cleaned up the area from any debris.…

Peony Transplant Query Following Deck Demolition

Last summer I transplanted a Peony bush, but it didn’t bloom this fall. The attached photo shows the transplanted stalks as dried and white, under the metal tripod with reddish metal suports. Should I just wait another season to see…

everblooming lilacs

I have two everblooming lilacs which were professionally planted last year in a large planter on my terrace. This spring they had lots of blooms and were lovely. They now however look bedraggled and did not bloom again. Their leaves…

Powdery mildew on my trumpet vine.

I live in north Toronto and have a 10 year old trumpet vine Growing on my iron fence, so it gets plenty airflow. Sun in the morning until 1:00PM, then shade. What can I do to avoid the spread? Is…