Plant Crocosmia in spring or early summer in well-draining soil; about 23 inches deep, 6 inches to 8 inches between the bulbs. Find a place full of sunlight because these flowers grow in direct sunlight. Make sure that the soil is fertilized with compost. Water lightly immediately after planting so as to settle the bulbs and never apply too much water that will lead to rotting. Adequate spacing aids in the circulation of air and promotes colourful flowers in summer.