Pruning: Deadhead climbing aster plants in fall or winter, once the final blooms have faded. Do not complete any additional trimming at this time, however, which would be a pruning mistake and can ...

This is called stopping, pinching or tip pruning and is used to make bushier ... on hardy perennials such as daylilies, crocosmia and asters. It will make the garden look tidier and stop pests ...