Continue to deadhead annuals and perennials to encourage additional flowers.
Allow certain dried flowerheads to remain standing for fall and winter interest, including astilbe, coneflower, globe thistle, and others.
Remove yellowed or dried stems and flower stalks of lilies by gently pulling them from the underground bulbs.
Place small stakes in the garden bed where tulips, narcissus, lilies, alliums, and other fall-planted bulbs will go.
Water container gardens as needed. Continue to feed container plants with quarter-strength liquid balanced fertilizer twice a month.
Consider adding to garden beds garden chrysanthemums, asters, or other fall-flowering plants to further extend the flowering season. Many greenhouse-grown mums are not hardy and will not survive over the winter. The earlier the mum is planted in your garden, the greater the chance of survival over winter. Mulch newly planted perennials immediately.
Remove yellowing daylily foliage or leaves that are browned and spotted. Green leaves must remain on the plant to continue to manufacture food. Deadhead individual flowers to keep plants looking tidy.
Daylilies can be divided and replanted or new plants can be installed at the end of this month. Peonies can be planted at the end of this month and into early fall.