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Should I trim back Aster October Skies?

This has a different growth habit than the other aster I have, Alma Potschke. October Skies is more mounded. For Alma Potschke, I cut back the tips on the outermost stalks, to increase branching and stretch out the bloom time. Otherwise it would get very tall, like 4 feet, then fall over.

I've had October Skies for 2-3 years. It's spreading pretty wide; over 3 feet. At this rate, will it get floppy by the time it blooms?

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