In my experience as a gardening and landscaping expert, I have found that Yellow penstemon, also known as Penstemon barbatus, is not an aggressive plant. It forms clumps and does not spread aggressively through vegetative means. This means that it doesn’t send out runners or rhizomes to take over the surrounding area.
However, it is worth noting that Yellow penstemon can occasionally produce volunteer seedlings, particularly in moist soil conditions. These seedlings may pop up near the parent plant or in nearby areas. While this can be seen as a minor inconvenience, it is not a cause for major concern or considered an aggressively weedy habit.
To give you a better understanding, let me share a personal experience. I have planted Yellow penstemon in my garden, and while it does self-seed to some extent, it has never become a nuisance or taken over the entire area. I have found that occasional thinning or removal of seedlings is sufficient to maintain control and prevent overcrowding.
It’s important to note that the invasive potential of a plant can vary depending on the specific growing conditions and climate of a particular region. While Yellow penstemon may not be considered aggressive in one area, it’s always a good idea to check with local gardening resources or consult with local experts to get a better understanding of how it behaves in your specific region.
While Yellow penstemon can produce volunteer seedlings, it is not an aggressively weedy plant. Its clump-forming growth habit and non-aggressive nature make it a suitable choice for most garden and landscaping settings.
