Division is a method of plant propagation where the crown of the plant is separated into smaller pieces for propagation or rejuvenation. Each divided piece must have at least one bud and some roots. Benefits of division include acquiring several new plants and rejuvenating mature plants. Certain species like lavender and rosemary cannot be divided as they do not form crowns. The timing of division depends on when the plant blooms - spring bloomers are divided in fall and fall bloomers in spring, avoiding periods of active growth. Plants are divided when they have outgrown their space or have decreased flowering over years. Perennials form clumps over time and dividing allows producing several plants from one.
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