An inch across, Dahlberg daisies arise en masse in spring and summer, on 12-inch plants.. Dahlberg daisies grow well in full sun and well-drained, moderately fertile soil. However, they will also grow and bloom abundantly in poor soil and hot weather as well!. Plant outdoors when the soil is warm and the danger of frost has passed. Space 6 to 12 inches apart. It makes a superb edging for beds and borders and can be used as a ground cover plant for sunny areas.