To avoid this, it’s best to dig up and divide your daisies every three to five years. The perfect time to do so will be after the blooms wilt and the leaves fall off. You can actually divide them right as they finish blooming or later in the fall when the foliage completely dies back. You should divide them every three to five years if you want fuller plants and to avoid those awkward bald spots in the middle. · for this reason, dividing a shasta daisy every three to five years to rejuvenate the colony and promote more vigorous growth and blooms is recommended by plant experts. While shasta daisies can be divided in spring too, plants that are divided in fall have more time to settle into the garden and generally flower better and earlier the following year. This is necessary for plants with less-vigorous foliage growth, smaller flowers, or sparse or dead parts. Shasta daisies can be transplanted in either late fall or early spring when new growth appears. · sure, you can divide them in spring, but doing it in the fall gives them plenty of time to settle in before the next growing season, leading to bigger, better blooms. · but when it comes to shasta daisies , dividing plants in fall is usually the best option. The best rule of thumb for dividing perennials is to dig up spring and summer bloomers in autumn and fall bloomers in spring. · to maintain the best blooming of daisies, divide them every 2 to 3 years , either in early spring or late summer or early fall. When can i divide shasta daisies ? Spring transplanting may delay blooming slightly, but it is better to divide overgrown perennials in the spring than to delay division until fall. · shasta daisies (leucanthemum x superbum) perk up any garden, but if yours grow leggy and not quite so perky, its probably time to divide them.