Purple likes a position of full sun and remember to water moderately. Keep in mind when planting that Purple is thought of as half hardy, so it will need cloching or fleece protection when the temperature dips.
Growing Purple from seed
Look to ensure a distance 1.95 feet (60.0 cm) between seeds when sowing - bury at a depth of at least 0.23 inches (0.6 cm) deep. Soil temperature should be kept higher than 20°C / 68°F to ensure good germination.
Transplanting Purple
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Purple is a half hardy plant.