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Choosing the right time to increase plants is vital for subsequent success. Seeds are mainly sown in greenhouses in late winter and spring, and outdoors in spring and early summer. Herbaceous perennials are best divided in spring. Softwood cuttings are usually taken in late spring and early summer (when soft shoots are available); half-ripe cuttings (also known as semi-hardwood cuttings) mainly in mid-summer; and hardwood cuttings from mature wood usually in late summer and early autumn, but they can be taken until late winter.