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Few indoor plants are as forgiving as the peace lily, but coaxing one to put out its sculptural, creamy white spathes once October slips away is a different challenge entirely. As fall sets in, the window to encourage fresh flowers is closing fast.

Temperatures are dipping, natural daylight is fading by the afternoon, and central heating systems are beginning to strip indoor air of its ambient moisture. Left to fend for itself in a dim corner, a peace lily will naturally wind down its metabolic engine and head straight into winter dormancy.

Triggering one final, dramatic flush of fall blooms before the cold locks in requires working with the plant's seasonal biology, rather than fighting it.

1. Shift to bright, indirect morning light

In the height of midsummer, direct sunlight is the fastest way to scorch peace lily foliage.…