They grow well in a standard peat moss/sand which can be anything from 50% to 70% peat moss. There's no need to fertilize, as the plant relies on insects for food.
A very beautiful, very interesting looking plant. Frilly, double, midnight-purple fluted horns or trumpet flowers, with white interiors burst open in profusion throughout the Summer.
Calendula officinalis (pot marigold, ruddles, common marigold, garden marigold, English marigold, or Scottish marigold) is a plant in the genus Calendula of the family Asteraceae.