forsythia

Question

Some or the leaves are turning dark. Is this normal? I just planted it this year.

Answer 1

On some varieties, such as vining forsythia, it is normal for the foliage to turn dark. On the other hand, if it isn't a variety that normally turns dark, this can be a sign of slight over-fertilization. Now if you haven't fed the plant or changed its soil recently, then I would be inclined to believe that it is a pH issue. For controlling pH in soil, and just in general for the health of the soil zone, Dolomitic lime is a good thing to keep around. Just add it once or twice per year, and it will help. Here are a fews articles that will help: https://www.gardeningknowhow.com/ornamental/shrubs/forsythia/