China Aster Syringa White | Callistephus chinensis

China Aster ‘Syringa White’ | Callistephus chinensis

The China Aster ‘Syringa White’ is a stunning newcomer to the professional cut-flower world, combining classic elegance with modern breeding performance.
Part of the recently developed Syringa Series, this variety delivers extra-large, fully double blooms reminiscent of chrysanthemums — yet finer in texture, rounder in form, and more refined in color.

Each plant produces impressive XXL flowers, 12–15 cm in diameter, held on strong, florist-grade stems with an upright, pyramidal growth habit reaching 60–70 cm tall.
Its bright, clean white blossoms bring a sophisticated touch to summer bouquets, wedding arrangements, and floral installations — perfect as a focal flower or for balancing colorful designs.

The Syringa series surpasses all previous aster lines in stem strength, durability, and vase life, making it a must-have for both professional growers and floral artists seeking premium performance.

Plant Information

• Botanical name: Callistephus chinensis
• Variety: Syringa White
• Type: Annual
• Height: 60–70 cm
• Bloom type: Fully double, chrysanthemum-type
• Bloom color: Pure white
• Bloom size: 12–15 cm
• Days to maturity: 110–120 days (short-day flowering)
• Plant habit: Upright, pyramidal, well-branched
• Stem quality: Thick, straight, long-lasting
• Light: Full sun
• Soil: Fertile, well-drained, humus-rich (pH 5.5–7.5)
• Plant spacing: 15–30 cm
• Vase life: 7–10 days
• Pollinator-friendly: Yes
• Cold tolerance: Hardened seedlings down to –3 °C; mature plants up to –6 °C
• Use: Professional cut-flower production, bouquets, floral design, borders

Sowing & Growing Instructions

• From sowing to flowering: 110–120 days
• Sowing indoors/greenhouse: From March onwards
• Direct sowing: Late April – early May
• Germination: 3–7 days at 21–22 °C; reduce to 8–12 °C after sprouting
• Sowing depth: 0.5 cm; cover lightly with vermiculite, keep evenly moist and well-lit
• Fertilization: Start 10 days after emergence with 0.1 % potassium nitrate; continue with calcium nitrate and balanced fertilizer
• Site: Sunny, well-drained, nutrient-rich soil
• Harden off seedlings before planting outdoors to improve cold tolerance.

Highlights

• XXL white blooms (12–15 cm) on strong, upright stems
• Excellent vase life and transport durability
• Compact, uniform growth ideal for professional cutting
• Tolerates light frost and cooler growing conditions
• Beautifully refined flower form — elegant and modern