Hollandia Purple Crown Sweet William is a striking cultivar of Dianthus barbatus that brings bold purple-crowned flowers to spring and summer gardens. Growing 18-24 inches tall with a compact 8-12 inch spread, this hardy perennial flowers reliably from seed to bloom in 112 days, making it practical for gardeners in zones 7 and warmer. The plants thrive in full sun with moderate water and actually improve their bloom production with consistent moisture, though they handle drought well once established. Deer and pollinators both find these flowers irresistible, and they're virtually pest-proof in well-spaced beds.
8
Full Sun
Moderate
7-7
24in H x 12in W
—
High
Hover over chart points for details
The Purple Crown blooms generously throughout spring and summer, rewarding consistent watering with even heavier flower production than drought conditions alone would provide. This cultivar handles both wet and dry spells with grace, making it one of the more forgiving dianthus varieties for variable weather. Space plants just 8 inches apart and they'll quickly fill beds with those distinctive purple-crowned flowers that both butterflies and hummingbirds can't resist, all while staying deer-proof.
Hollandia Purple Crown Sweet William excels in spring and early summer flower borders, cottage gardens, and cut flower arrangements. The clustered blooms are excellent for cutting and bring a rich, spiced-clove fragrance indoors. These flowers also work beautifully in pollinator gardens where their nectar-rich blooms attract butterflies, bees, and hummingbirds throughout the growing season.
No timeline data available yet for this variety.
Sow seeds indoors 10-12 weeks before your last spring frost. Keep the seed bed at 65-70°F until germination occurs, which typically takes 7-14 days. Once seedlings emerge, drop the temperature to 55-65°F to prevent legginess. Harden off transplants by gradually exposing them to outdoor conditions before moving them into the garden.
Transplant seedlings outdoors after the last frost date has passed and soil has warmed. Space plants 8 inches apart in full sun. Gently firm soil around each transplant and water well to settle the roots.
For blooms the following year, direct sow seeds outdoors from spring through mid-summer. Scatter seeds on the soil surface or just barely cover them (sowing depth is 1/16 inch). Keep the seedbed consistently moist until germination and seedlings are established.
Deadhead spent flower clusters regularly throughout the bloom season to encourage additional flowering and keep plants tidy. Remove any leaves showing spots or damage to improve air circulation and reduce disease pressure.
Enter your ZIP code to see a personalized growing calendar for this plant.