Overwintering Geraniums in Cool Climates

Geraniums (pelargoniums) can be successfully overwintered indoors in northern climates like northern Spain. The key is providing a cool, bright, dormant period that mimics their natural rest cycle.

Ideal Winter Conditions

Move potted plants to an unheated room, cool garage, or cellar with fluorescent lights. Maintain temperatures above freezing but cool (45–55°F ideal). Water very lightly—only once every 3–4 weeks—just enough to prevent the root ball from completely drying out. Provide bright light; a south-facing window works well.

Spring Transition

Expect some leaf yellowing and drop during dormancy—this is normal. In spring, move plants back outdoors after frost danger passes, resume regular watering, and they'll quickly regrow. The cool, dry rest period is essential for vigorous spring growth and flowering.

Alternative: Cuttings

If space is limited, take 3–4 inch cuttings in fall, root them in moist perlite or vermiculite, and grow the smaller plants over winter. They'll be ready for outdoor planting by spring.