Yellow False Acacia, Black Locust, Yellow Locust 'Semperflorens'

This cultivar has a second bloom in August-September, so it's effectively in bloom much of the summer. It's said to have few or no thorns...Read More on its branches. Less prone to wind damage than the species due to its more open branching. It's a very popular street and park tree in Germany.

This is not considered invasive in the southwestern US, where it's a tough, moderately xeric landscape tree.

Black locust is often considered invasive through much of eastern and midwestern North America where it's been planted outside its native range, especially in open scrub-pine/oak woodlands with low-fertility sandy soils. It tends to form spreading colonies by root suckering. The suckering can become problematic in gardens.

Black locust (Robinia pseudoacacia) is considered invasive by the Minnesota DNR
"Ecological Threat:

* Invades prima...Read Morerily disturbed habitats, degraded wood, thickets and old fields crowding out native vegetation of prairies, oak savannas and upland forests, forming single species stands.
* It reproduces vigorously by root suckering and stump sprouting forming a common connecting root system.
* It is native to the U.S. and occurs naturally on the lower Appalachian mountain slopes. It has been extensively planted for its nitrogen-fixing qualities and its hard wood."