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