Like many garden perennials, hardy chrysanthemums benefit from being divided every few years. This is best done in late spring and helps to reduce overcrowding, reinvigorating the plant and providing you with a few extra plants. However, an equally easy propagation method, and one that produces far more plants, is by cuttings. Cuttings can be taken in the late spring and early summer, and are best taken in the morning before the heat of the day and when the shoots are turgid.
Immediately remove the lower leaves
Do this to reduce transpiration (the evaporation of water from plant leaves).
Neaten them once inside
Once the cuttings have been safely brought into the potting shed or glasshouse they can be neatened up and stems shortened.
Make it a clean cut
Ensure the stem cutting is clean with no ragged edges or tears, which may risk rot entering and any larger remaining leaves can be cut in half to further reduce transpriation.
Insert your stem into a pot
Trimmed cuttings should be inserted around the edge of a terracotta pot filled with a free-draining cutting compost. The terracotta is breathable and allows for more oxygen to reach the active site of rooting.
Maintain humidity around the plant
A plastic bag is an effective and inexpensive way to maintain humidity. Once the cuttings have been well watered – using a fine rose, so as to not disturb the cuttings – place the bag over the pot. It is important that the leaves do not touch the inside of the bag as condensation will increase the risk of rot and grey mould.