Questions on: Aster Ron Smith, Horticulturist, NDSU Extension Service

Q: Should I cut my asters this fall or should I wait until spring? Also, should we cut our lawn short or should it be left long for the winter? (Sioux Falls, S.D.)

A: Cutting asters or other perennials back is a matter of choice. Some like to have the stalks remain through the winter to help trap snow for better moisture and winter interest. Others want a clean, snow-swept landscape. As for the lawn, drop the mower down a notch for the final mowing and collect the clippings.

Q. Why are my asters turning yellow and starting to dry up right before they bloom? (Miller, S.D.)

A. Well, there are aster yellows, rust, and powdery mildew that beset these beautiful plants. My guess from your description is that it is likely serving as the alternate host to pine-needle rust. If you or your immediate neighbors have pine trees, they are likely being afflicted with this disease and passing it back to the asters you plant.

My suggestion; try a different annual—there are plenty out there!

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