Leucanthemum x superbum. Madonna sets a new standard for Shasta daisies. It was a shining star in our flower seed trials, and the winner of a Fleuroselect Gold Medal for 2020. This new hybrid forms a blanket of incredibly uniform flowers that keep coming all summer, with new flowers emerging over the faded ones. Just about 15% of the flowers have petals that are frilled at the tips. The result is a mounding habit that makes a stunning show in containers, raised beds, or borders. Madonna is a first-year-flowering perennial that is hardy to Zone 3. It is vigorous, and compact at only 20-25cm (8-10") tall. It's even deer resistant.
Learn how to grow Chrysanthemums from seed. These perennial plants regularly undergo name changes, and may be listed as Chrysanthemum, Leucanthemum, Pyrethrum, or Tanacetum.
Shasta daisy: Leucanthemum x superbum & Painted daisy: Chrysanthemum coccineum
Season & Zone
Exposure: Full sun
Zone: Leucanthemum is hardy to Zone 3, but most are grown as annuals.
Start indoors in late winter to mid-spring, and transplant or direct sow starting around late May. They can also be direct sown in mid-September to October.
Sow seeds on the surface of a sterilized starting soil. Provide bright light and use bottom heat to keep soil at 18-21°C (65-70°F). Seeds will germinate in 10-14 days. Space transplants at 25-45cm (8-18″) apart.
Grow in a rich, well-drained, evenly moist soil in full sun. Good drainage in winter is essential. Pinch back young plants to keep them bushy. Deadhead regularly. Taller plants may require staking.
White flowering mums repel Japanese beetles.
More on Companion Planting.