However, most slowly recovered from the 7 F official low, but it was nearly mid-June before the first signs of new foliage began to emerge from ground level. Cassia nemophila is generally considered to be the hardiest of the commercially grown species. Little is required to maintain the cassias other than an annual pruning, commonly done just after the peak blooming period. This is done to reduce the numbers of messy seed pods and to keep the rapidly growing plants in bounds. Additional maintenance pruning can be done at any time, but avoid doing this late in the season as the buds begin to form early in the fall for the spring show.
Most landscape managers maintain the cassias in a general rounded pear shape by informal pruning.
This is the most natural appearance. Although the plants respond well to shearing into hedge forms, the landscape will appear contrived and too formal if trimmed into boxed or ball shapes. Cassias may be easily kept much smaller than the listed maximum size of 6 feet. Occasionally one might find a seedling or two emerging from underneath a mother cassia shrub. With the profusion of seed produced, this is to be expected.