Plants should be spaced 15 to 24 inches apart. A button mum with sprays of flowers on branched stems. Established plants can be divided in the spring when early growth has started and after the danger of a hard freeze is past. The field-grown clump, if left intact, is not desirable planting material because of its large size. In dividing a plant, lift the clump out of the soil.
Some varieties grow well year after year without resetting.
Others should be divided and reset every year to maintain vigor. On the average, resetting plants every other year is a good practice. Culture Newly set mum plants should be kept uniformly moist, not wet, during establishment. Do not let established plants suffer from lack of water, but over-watering also should be avoided. One good watering or rain per week, the equivalent of one inch of water, usually is adequate.