Look to ensure a distance
11.7 inches (30.0 cm) between Her Majesty's Wizard seeds when sowing to make sure your seedlings have enough space.
By our calculations, you should look at sowing Her Majesty's Wizard about 42 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Her Majesty's Wizard is a hardy plant.