How to overwinter pelargonium x domesticum 'lavender grand slam'

Pelargonium x domesticum 'Lavender Grand Slam' is hardy to roughly USDA zone 9 — winter lows around -7°C. That means it takes cool conditions but not a real freeze. Pelargonium x domesticum 'Lavender Grand Slam' will take cool conditions but not a hard freeze, so the aim is a frost-free winter rather than a warm one. An unheated greenhouse, porch, conservatory or bright garage all work well. Keep it cool, bright and on the dry side, and it will hold steady until growth restarts in spring.

Move under cover before the first hard frost; back outside after the last spring frost.

Water only occasionally — enough that the rootball never dries out completely, no more. No feeding until spring growth begins.

Bringing pelargonium x domesticum 'lavender grand slam' into a warm living room. Too much winter warmth forces weak, pale growth that collapses when it goes back outside — cool and bright beats warm and dim.