The best time to plant sunflowers is generally from mid-April to the end of May, after the threat of frost has passed. Seeds can be sown directly into the ground in late April or early May, or started indoors in pots from late March or April, then transplanted outside when seedlings are around 30 cm tall. Sunflowers need a sunny, sheltered spot and rich soil to thrive. For prolonged blooming, sow seeds every couple of weeks throughout the planting season. In milder climates or specific zones, planting time may vary slightly; for example, in warmer zones, sowing can start as early as February or March after the last frost. Protect young plants from slugs and snails, and water regularly for best results.