With proper care. the cut stems of Campanula will last 20 days. Recut the stems every few days and refresh the vase water.
Exposure: Full sun
Start indoors 8-10 weeks before last frost date. Seeds should germinate in 20-30 days. Ideal soil temperature for germination: 18-21°C (65-70°F).
Barely cover the tiny seeds. Use fresh seed starting mix and keep it moist until germination. Harden seedlings off over the course of at least one week. Transplant out after last frost at 25-30cm (10-12″) apart.
Choose any well-drained garden soil with a neutral pH range of 6.0-7.0. Trim plants lightly after flowering to encourage a second bloom. Iberis may self sow.