Purple robe locust, also known as black locust (Robinia pseudoacacia ‘Purple Robe’), is a deciduous tree that is known for its beautiful purple flowers and ornamental value. However, it is important to consider its invasive nature before planting it in your garden or landscape.
One of the main ways in which purple robe locust can be invasive is through its seeds. These seeds are dispersed by birds and other wildlife, which can lead to the tree spreading into surrounding areas. This can become a problem if the tree starts to take over and outcompete native plant species.
Another factor to consider is the tree’s root suckering ability. Black locust has a vigorous root system that can send up shoots from the base of the tree or from lateral roots. These suckers can grow into new trees, leading to the formation of a dense thicket if left unchecked. This can be particularly problematic in landscaped areas where the tree may spread into unwanted areas such as lawns or flower beds.
Furthermore, black locust has thorns along its branches, which can make it difficult to prune or maintain. This can be a deterrent for some gardeners who prefer trees that are easier to care for.
In my personal experience, I have seen the invasive nature of black locust firsthand. I once planted a purple robe locust tree in my backyard, attracted by its beautiful flowers and unique color. However, over time, I noticed that the tree started to spread through its root suckers, sending up new shoots in various areas of my garden. It became a constant battle to control the tree’s growth and prevent it from taking over other plants. Eventually, I had to remove the tree altogether to prevent further invasion.
To summarize, purple robe locust, or black locust, can be considered invasive due to its ability to spread through seeds and root suckering. This, combined with its thorny branches, should be taken into account when deciding whether to plant it in your garden or landscape. Consider alternative tree species that are less invasive and easier to maintain to avoid potential issues in the future.
