Larkspur can benefit from a period of cold period to sowing - pop the packet into a fridge for a week before sowing onto the surface of moist, well-drained seed compost from February to June, or September to October under glass. Sow in small pots or seed trays and keep at a temperature of around 10-15°C. Germination should occur in 2-4 weeks. Transplant seedlings into a cell tray and grow on into smaller pots, hardening off and planting out when the risk of frost has passed. Larkspur can be directly sown into a well-prepared bed from late April.