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A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

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Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

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Friday - July 04, 2014

From: Austin, TX
Region: Southwest
Topic: Pruning, Herbs/Forbs
Title: Optimal time for trimming Fall asters
Answered by: Guy Thompson

QUESTION:

RE: fall asters What is the latest date in the summer that I can trim my fall asters and still get a good amount of blooms in October?

ANSWER:

Symphyotrichum oblongifolium (Aromatic aster) or Fall aster does tend to become leggy, especially if watered regularly.  It is recommended that it be pruned back by about half in June.  I would imagine you could stretch that to early July, but hurry.

 

From the Image Gallery


Aromatic aster
Symphyotrichum oblongifolium

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