7230- Bright Lights. cosmos sulphureus. The intense dazzling yellow to reddish orange single flowers on this striking species Cosmos attracts bumblebees, birds, and beneficial insects, and looks terrific in a cut flower bouquet. Plant Bright Lights cosmos seeds in full sun. It’s easy to grow in a variety of soils – tend towards the dry side. Its natural drought tolerance makes it a good candidate for xeriscaping. Plants grow to about 1m (3′) tall, for the middle or front of a mixed border. Direct sow from early May right up until mid-June. Several sowings will result in a very long bloom period. You can also start Cosmos indoors in late March to mid-April. Seeds will sprout in 3-10 days. Optimal temperature for germination: 21-25°C (70-75°F).