Easy to transplant and establish, black locust requires little extra care beyond regular watering the first year after planting. Internal decay, borers, and black locust leaf miner regularly threaten black locust trees in the landscape. Borers and leaf miners rarely kill a tree but they do give it a brown appearance in late summer after they have ravaged the foliage or wood. The tree often recovers fully the following growing season. Internal decay can kill a tree. The overall tree structure becomes weak and the tree will break apart in wind storms. It is critical to monitor the health of black locust trees in urban and suburban landscapes. A weak tree can damage property or endanger people. Here’s how to eliminate borers in your yard.
Flower Power
More than a quick-growing tree, black locust is also beloved for its ropelike clusters of pink and white flowers in mid-spring. The flowers are frequent stopping points for bees. Black locust honey is prized for its rich flavor. The flower clusters are followed by flat, papery fruit pods. The pods are usually 2 to 4 inches long and don’t make a mess in the landscape. See more landscaping ideas for privacy.
More Varieties of Black Locust
Black locust
Robinia pseudoacacia is the wild form. It’s fast growing, offers fragrant white flowers, and reaches 80 feet tall and 50 feet wide at maturity. Zones 4-9
Golden black locust
Robinia pseudoacacia ‘Frisia’ has white flowers and bright golden-yellow foliage in spring and summer that turns orange in fall. It grows 50 feet tall and 25 feet wide. Zones 4-9
