- Garden mums (Dendranthema morifolium) are herbaceous perennials. Plant new chrysanthemums in early spring or fall. Spring planted mums have a chance to establish and grow throughout the summer months but must be maintained. Pinch back new growth regularly during the rapid spring growth season. Pinching back increases the number of branches, creating a fuller plant. When plants reach a height of 6 inches, trim them back 1/2 to 1 inch until July in cool climates and until August in warmer climates.
- Since mums are perennial flowers, they return year after year but only when overwintered properly. Once fall flowers are spent and faded, cut back stems down to ground level and discard them. When the ground freezes, mulch the area with loose evergreen boughs, straw or dry leaves. This provides insulation but also allows new shoots to emerge easily in spring.
- Chrysanthemums can be grown from seed but in order to maintain a uniform appearance and expected color, most chrysanthemums are propagated via cuttings or division. Divide chrysanthemums in spring and plant the rooted sections immediately. If you must wait, refrigerate the cuttings for up to three days before planting. Inspect roots for disease and damage. Do not plant damaged cuttings. Cuttings purchased from nurseries should be planted immediately to allow roots the chance to harden and develop. This makes them better able to overwinter.
- Containerized mums are overwintered indoors but must be allowed to go dormant. Cut back containerized mums and place them in a cool area like a basement or garage. Ensure that the soil is slightly moist, not saturated or wet. When spring temperatures arrive, remove the plants from the cooler location into a slightly warmer one. Do not set out containerized plants too early. Their root systems are not hardy because containers do not provide the same cultural conditions as in-ground plantings.
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