Gardeners should start splitting and transplanting perennials this October if they live in areas where the climate is similar to England's, while the soil is still warm, writes Nigel Colborn. Perennials are likely to thrive this month because the favorable soil temperature promotes rapid growth of the plants' root system as well as the development of embryo shoots. To propagate perennials, Colborn recommends uprooting a mature plant, getting rid of its older sections and replanting its younger portions.

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