|Updated : 21/9/2014|
How to Grow and Care for your Chrysanthemum PlantsChrysanthemum plants are just about the easiest of all of the perennials to grow. Mums should be planted in early spring after all danger of freezing, however they can be planted almost any time, as long as they have time to establish their root system before the hottest weather.
Growing Requirements of Chrysanthemum PlantsChrysanthemums grow best and produce the most flowers if they are planted in full sunshine. They respond to plenty of food and moisture.
There are hundreds of varieties of Chrysanthemums, giving you a multitude of options for height, color, flower size and time of bloom. You can pick and choose to fit your wants and needs when you visit the nursery.
In northern climates it is wise to purchase the earlier bloomers.
Mums can be started as seeds, from cuttings and dividing, or can be purchased at a nursery in sizes from bedding plants up to gallon size and larger plants. They should be planted into well prepared, fertile, sandy soil. Mums resent 'wet feet' so the hole should be dug extra deep.
It is recommended that you not grow your mums in the same spot for more than three consecutive years to help prevent associated disease and pest problems. The plants should be spaced 0.4-0.9m apart for best results. Feed lightly every 2 weeks with a good balanced all purpose fertilizer. When the plants are 150mm tall, pinch about 17mm from each branch to promote more blooms and bushier plants. When they reach a foot tall, pinch them again.
On the largest flowering types it is best to remove all buds except for the one on top.
Dividing and Transplanting ChrysanthemChrysanthemums should be divided every three to five years to avoid overcrowding and promote maximum flowering. They should be divided in the spring when new growth appears. Dig entire clumps and separate the plants with a sharp, clean knife or spade. Remove all dead and diseased plant parts.
Replant the divisions as soon as possible in a loose, well drained, rich organic soil. Chrysanthemums should periodically be moved to a new location, but if this is not feasible, the soil should be sterilized chemically to reduce danger of disease and insect problems.
Young divisions will grow much faster and provide a better plant than crowded old clumps. When the new shoots are 1-3 inches tall in early spring, dig up your old clumps and carefully pull them apart. plant the healthy divisions into newly prepared fertile soil and discard the half dead woody parts.
Propagating Chrysanthemums and Growing Them from SeedRemove the lower half of the leaves from a 100-150mm healthy, fresh cutting using a sharp clean knife.
Dip about 17mm of the cut end into a rooting hormone such as Roottone® or Hormonex®. Insert the cutting about one inch deep into sterile moist sand, vermiculite or sphagnum moss. Create a mini-greenhouse over the container with poly film over a wire frame and place it in a bright spot (NOT full sun) until the roots form.
Chrysanthemum seeds should be sown into the prepared soil where they are to bloom at least 2 months prior to the first frost. Seeds may also be started indoors in very early spring for later transplanting into the garden.
Caring for Mums in the WinterAfter your plants have been killed back by hard frost, cut them back to the ground and provide a light airy mulch of evergreen branches or similar material. The most dangerous hazards for Chrysanthemums in the winter are constant wetness or ice on the leaves.
Frost heaving caused by alternate freezing and thawing of the soil can also a major problem. To help with these problems and keep the plants somewhat protected and dry, you can mound the soil up around each plant, as well as creating a simple drainage ditch alongside.
To help avoid the heaving try to keep the plants somewhat shaded and insulate their roots with a light airy mulch.