When should spring-blooming perennials be divided?

Spring-blooming perennials should be divided in the fall. Dividing them at this time allows the plants to establish roots in the cooler temperatures before the winter. This is particularly beneficial because fall provides a window for the plant to grow new roots while being less active in terms of flowering and leaf production. It also means that when spring arrives, the newly divided plants are better prepared to emerge vigorously, taking full advantage of the growing season ahead.

Dividing in spring would disrupt the plants as they are actively blooming, which can stress them and reduce flowering. Performing this task in summer could lead to high temperatures stressing the plant, potentially resulting in less successful establishment. Winter is not ideal either, as the cold temperatures can hinder root development and lead to a lack of vitality in the divided plants when spring arrives. Therefore, fall is the optimal time for dividing spring-blooming perennials, ensuring their health and robust growth for the following season.