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Mountain West Regional Reports

Mountain West: September Garden To-Do List

‘Fifth Dimension’ hibiscus (Hibiscus rosa-sinesis ‘Fifth Dimension’, Zones 10–11). Decide which of your annuals and tropicals will be coming indoors as houseplants. Photo: Michelle Gervais

It’s time to decide which annuals and tropicals will be coming back indoors as the weather cools. Examine these plants and containers, wiping them down if possible, to discourage stowaway pests from coming indoors.

Watering needs are diminished, but September can still be warm and dry. Monitor moisture content in containers and beds.                   

This is an excellent time to lift and divide many perennials, especially irises (Iris spp. and cvs., Zones 3–9), daylilies (Hemerocallis spp. and cvs., Zones 3–10), and shasta daisies (Leucanthemum × superbum, Zones 5–9).

Hibiscus Flower
‘Jungle Fever’ daylily (Hemerocallis ‘Jungle Fever’, Zones 3–10). Now is a good time to divide daylilies. Photo: Stephanie Fagan
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