Yellow leaves on River Birch
During dry summers, the leaves on my birches turn yellow and drop long before the fall. To prevent that from happening, I usually place a hose under the tree and run the water slowly for about an hour to give the tree water. This year, however, that does not seem to work.
Over a period of the past two days, two of my birches have turned almost completely yellow and are about to drop all the leaves despite my watering.
Am I not watering the trees correctly? We had a hot spell last week (few days over 90), but most of the summer has not been that hot.
I live in Southeast Michigan and the three birches are located at the end of the property next to a drainage ditch that is usually dry unless we get an inch or more of rain.