Q.curling leaves on forsythia
We planted two very small forsythia plants in the spring of 2014 about 8 ft. from each other. One is flourishing and the other one is much smaller and one branch has small shriveled up leaves on it. Could this be a fungus or insects?
Inspect the shrub and leaves. Do you see any signs of insects or disease?
I do suspect watering is more likely an issue. The shrubs are new plantings.
Winter was incredibly hard on gardens across much of the United States this last winter. This could be adding to the stresses on the shrubs.
It is not unusual for two plantings to grow differently.
Forsythia likes to be watered and a good guideline is 2 " of water weekly.
Here is a link about the care requirements.
https://www.gardeningknowhow.com/ornamental/shrubs/forsythia/forsythia-shrub-care.htm
