Based on my experience as a gardening and landscaping expert, I can confidently say that Sky Blue Aster (Symphyotrichum oolentangiense) is not considered invasive. Unlike some other aggressive Asters, Sky Blue Aster does not spread rapidly through rhizomes and seeds. This is one of the reasons why it is commonly included in rain gardens and flower beds.
I have personally observed and worked with Sky Blue Aster in the Prairie Moon Rain Garden for nearly 10 years, and we have not encountered any problems with its invasiveness. The plant has been able to thrive in this controlled environment without taking over or causing issues with other plants.
One of the reasons for its non-invasiveness may be its limited method of propagation. While some aggressive Asters can spread through both rhizomes and seeds, Sky Blue Aster primarily reproduces through seeds. This means that its spread is not as rapid or extensive as those plants that have multiple methods of reproduction.
In terms of cultivation, it is important to note that Sky Blue Aster benefits from being planted and mulched. This helps provide the plant with the necessary nutrients and moisture it needs to grow well. By giving it the right conditions, you can ensure that it thrives without becoming invasive.
It’s worth mentioning that experiences may vary in different gardening contexts and regions. However, based on my personal experience and knowledge, I have not encountered any issues with Sky Blue Aster being invasive. It has proven to be a reliable and attractive addition to rain gardens and flower beds without causing any negative impacts.
Sky Blue Aster is not considered invasive and can be safely included in rain gardens and flower beds. Its limited method of propagation and the absence of aggressive spreading through rhizomes make it a suitable choice for controlled environments. However, it is always important to monitor and manage plant growth to ensure it does not become problematic in specific situations.
