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You can transfer plants into the garden when they are large enough.
You can transfer plants into the garden when they are large enough.
====Asexual propagation====
For big perennial species, especially the sterile hybrids, which do not produce viable seeds, propagation by division is the best (or only) way to get more of the same species.
It is best to divide the clumps while they are actively growing, to reduce the amount of stress caused, so during early spring, when the new leaves are beginning to form. The first thing is to find a sizeable clump of the plant and then to carefully lift it and tease it apart into several smaller clumps. It is much better to tease the clumps apart with your hands, or the gentle use of a [[garden fork]] then slicing with a knife or spade.
After completing the division, the plants should be potted up and kept under cover until they have well developed root systems.
===Pests and diseases===
===Pests and diseases===