We talked about division and taking basal cuttings- dividing herbaceous perennials serves to rejuvenate the plant and also makes more plants. Dividing plants is very straightforward and new plants are made instantly and should grow and flower in the same year if divided in spring or the following year if divided in autumn. You have to wait until there is a reasonable clump - so don't attempt to divide new plants too soon. Plants can be divided every 3-5 years. Basal cuttings can be taken from plants like achillea, geraniums or phlox although not every plant is suitable as some won't cope with being pulled apart. Sever a shoot near the base, strip the lower leaves and pinch out the growing tip to help root growth- put in compost in pots and pot on when there is good root growth.
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