Lace Mantle is a new day length neutral variety bred to start blooming the first year from seed. Sweet Williams grow best in well drained, moist fertile soil. Plant them in full sun; in very hot summer areas, they will thrive with partial or light afternoon shade. Keep well-watered and feed several times during growing season. Cut when clusters of large florets are half open: buds open well in water and last for up to 10 days. After the first flush of bloom is over, cut back spent flower heads for rebloom.
BEST TO START INDOORS
In spring, 8 to 10 weeks before last expected frost date, sow seeds 1 inch apart in a container of seed starting mix. Cover very lightly, no more than 1/4 inch deep, and keep moist while awaiting germination. Provide a strong light source for seedlings until they are ready to plant outside. Once large enough to handle, transplant seedlings 2 to 3 inches apart into deeper containers or pots so root systems have room to develop. Feed every 2 weeks with half-strength fertilizer. When 3 to 4 inches tall, gradually acclimate to outdoor conditions and plant 12 inches apart in full sun in early spring after frost danger is over.