Continue to deadhead both annuals and perennials to encourage additional flowers.
Return of cool weather is a good time to refresh annual containers with cool-season favorites such as pansies, ornamental cabbage and kale, chrysanthemums, or fall-blooming asters. Asters and mums purchased in bloom this month are usually greenhouse-grown and not necessarily hardy. To increase their chances of making it through the winter, plant them directly in garden beds, rather than containers, early this month so they can establish their roots for a good four to six weeks before frost. Water well and mulch plants right away.
Do not cut back perennials until their leaves and stems have lost all green color.
Daylilies and peonies can be divided or planted early this month. Water well to encourage healthy root development. Peonies should be planted so that the buds or eyes are no deeper than 2 inches below soil level. If planted too deeply, they will fail to flower.
Make final selections of spring-blooming bulbs but don’t plant any until later in October and November.