To propagate bellflowers, you can either take stem cuttings from young, healthy growth in the spring, removing the lower leaves and planting them in well-draining soil, or divide established plants in early spring by carefully separating the root ball into smaller sections and replanting them individually; both methods require keeping the soil moist and providing a humid environment until roots establish. 

Propagation methods: Primarily through stem cuttings or dividing established plants. 

Best time to take cuttings: Early spring, when new growth emerges. 

Cutting technique: Take a 3-4 inch stem cutting just below a leaf node, remove lower leaves, dip in rooting hormone, and plant in moist potting mix. 

Division technique: Carefully dig up the plant, gently separate the root ball into smaller sections with multiple shoots, and replant each section. 

Aftercare: Keep the newly propagated plants in a shaded area with consistent moisture until they establish roots.