black locust

Black locusts (Robinia 'Purple Robe') should be watered every other day when temperatures are at their highest. During the warmer months of the year, you should be sure to water the plant deeply until moisture reaches the roots. During cooler and winter months, allow the top hook of soil to dry out before watering again. When in doubt, always check the soil in the pot for moisture levels. If the upper hook of soil is still wet, wait a few days before watering again. Lastly, always ensure that the soil is slightly moist, but not waterlogged.

Black locust (Robinia 'Purple Robe') should receive at least 6 hours of direct sunlight per day in order to flourish. This tree grows best when exposed to full sun in the morning and partial shade for the remainder of the day. If possible, the tree should be located in an area that gets some afternoon shade. In cooler climates, Black locust can tolerate full sun during the heat of the day. For optimal growth, it should receive at least 6 hours of direct sunlight per day, with the ideal recommended range being 8-10 hours during peak summer months.

Black locust (Robinia 'Purple Robe') should be pruned in late winter or early spring. Depending on the desired form, light pruning may be done for shaping or improved flower production. If severe pruning is planned it is best to do it over 2 or 3 years, reducing a third or less of the growth each year. Keep in mind that some sucker growth will occur with black locust and will need to be managed. Dead or diseased branches should be removed as part of regular maintenance.