Canterbury Bells, Zinnias, and Long-Lived Indoor Flowers

Canterbury bells (Campanula medium) are biennial: rosette year one, bloom year two, then die. Indoors, same cycle. Deadheading after bloom may (50% chance) trigger a second bloom, never a third. Sow seed annually for continuous flowers.

Zinnias are true annuals—frost kills them. Indoors, they'll still bloom and die. For year-round color, sow successive batches every 2–3 weeks.

Long-lived indoor flowers: Tender perennials like petunias, nasturtiums, salvias can overwinter indoors if kept warm and bright. True annuals must be reseeded. Check plant labels: "tender perennial" means it can be kept over winter.

Rootbound plants: Most become rootbound eventually. Repot into larger containers as they grow. Start small, move up gradually.