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Division of plant heads:
Perennials that have been planted for a long time and well developed can be propagated by the division method; generally it proceeds in autumn, when the plants are about to enter a period of vegetative rest. We proceed by uprooting the plant from the soil in which it is grown; shake it well to remove the soil attached to the roots, in this way we can better evaluate the size of the root system. To obtain new plants, divide the tuft into some portions, trying to avoid damaging the foreign vegetative parts; for this operation we use well sharpened and sterilized shears, in order to make clean and neat cuts; possibly we clean and disinfect the blades of the tool every time we are going to divide a new plant. We check that each portion practiced retains a good amount of well-developed roots, to facilitate the rooting of the new plant. Once the new seedlings have been prepared, place them in a good, soft and rich substratum, which also has an excellent drainage. We water the soil thoroughly.