Propagation
Surface sow fresh seeds when ripe (early spring) in a well-drained media and maintain a temperature of 19º to 24º C. (66º to 77º F). 

Germination takes from 1 to 3 months. Prick out and pot up when they are large enough to handle and plant out after all risk of frost has passed.

Note:
Care should be taken when handling the plant as it may cause skin irritation or allergic reaction. The seeds are poisonous if ingested.

Botanic information
Leaf: The mid green elliptical leaves have serrated margins with shallow lobes and the petiole is long. The upper surface is pubescent along veins. 

Flower: The salverform flowers are arranged in an umbel on a slender scape that is up to 300mm (1ft) tall with 6 to 12 flowers per whorl. There are available in single and doubles in a large colour range and appear during spring.

Fruit: The small capsule has 5-10 valves and the seeds are very small, 10,000 per gram. It will easily self-sow and may become weedy. 
During cultivation seed heads are normally removed.
Care should be taken when handling the plant as it may cause skin irritation or allergic reaction. The seeds are poisonous if ingested.