Early sowing secrets for vibrant summer blooms by June
Gardeners looking for early summer colour can start sowing seeds indoors as early as December. Different flowers have specific needs for temperature, light and planting depth to ensure strong growth. With the right approach, blooms like begonias, calibrachoa and pansies can thrive by late spring or early summer.
Begonias should be sown in January or early February for early summer flowers. Their seeds germinate quickly—within 5 to 7 days—when kept at around 95°F (35°C). This warmth speeds up sprouting, giving them a head start before outdoor planting.
Calibrachoa seeds need a gentler approach. They should be scattered evenly over damp soil and covered with a plastic bag to retain moisture. The ideal temperature for germination is between 73°F and 82°F (23–28°C). Unlike some plants, calibrachoa does not require pinching and will naturally form compact, bushy plants by June.
For pansies, sowing indoors in early February leads to mid-May blooming. Seeds should be planted 2 to 5 millimetres deep, with the best germination occurring at 64–68°F (18–20°C). These cool-season favourites grow well as annuals when started early.
Lisianthus seeds benefit from an even earlier start—December or February—if growers want early flowers. They germinate best in light, with temperatures between 68–77°F (20–25°C). Proper conditions help them develop strong roots before transplanting.
Geraniums grown from seed tend to be bushier and bloom earlier than those from cuttings. Their compact growth makes them a popular choice for containers and borders.
By following these guidelines, gardeners can achieve healthy seedlings ready for transplanting. Early sowing and controlled conditions ensure vibrant blooms by late spring or early summer. Each flower type has its own requirements, but careful timing and temperature management lead to the best results.
