How to grow Basil Dark Opal Seeds
Sow basil seeds indoors in a greenhouse or on a warm windowsill, and don't move plants outside until summer. Or, plant outside when temperatures are 18 C or warmer.
Basil Dark Opal likes a light, well-draining soil with some well-composted material. Cover seed lightly with fine soil and keep moist during germination. When the seedlings are about 5cm tall, thin or transplant and set plants outside when it is warm and after all danger of frost.
Harvest leaves regularly and remove flowers to concentrate the plant's energy on leaf production Germination takes about 7-21 days and plants mature in approximately 60-90 days.