What would cause dinner plate Dahlias to dry up?
Have several dinner plate dahlia plants, this is the second year for the bulbs. Many of the leaves on some of them just seem to be drying up. We have had terribly hot and humid weather this year–but it doesnt seem to be mildew or any of the viruses dahlias are known for. They are planted in an area where there is clay soil–they are about 5 feet tall. Could it be that the roots are now into the clay? Any thoughts would be appreciated.
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It might be time for them to get ready for the first autumn frost. All of our plants have made seed and are about to turn brown for autumn. We think it is going to be an early winter this year.
We have clay soil too and have found that we need to water each morning to the point of about 2 or 3 inches deep when the weather is in the 90′s.
By the way, do not fertilize once the weather reaches 90 degrees. And not at all after August 1st. The plants need to get ready for their winter sleep.
Happy gardening to you.