dahlia leaf issue
attached is the picture . i am concerned regarding the curling new leaf when the leaf is formed it is curled. when it opens it is a harder texture than a tradition leaf. is this okay and if not is this a condition i should be treating it. this is happening on all of these .. some are from tubers, some from two pony garden
Hennepin County Minnesota
Are you seeing anything other than the leaf curling? Aphids will cause this to happen, but will also leave a stick residue on the leaves. Viruses can also cause deformed leaves, but have many other symptoms.
I would advise you to inspect the plant for insects or anything else out of the ordinary. Insects that cause this kind of damage can be easily treated with a heavy spray with the hose or insecticidal soaps. Plants that are infected with a virus will need to be removed.