Zinnia - Key Growing Information

A row of several zinnia varieties in our recent trials, from which we selected the top-performing cultivars.
DAYS TO GERMINATION: 3-5 days at 80-85°F (27-29°C)

SOWING: Transplant (recommended) - Sow into 72-cell flats 4 weeks before last frost. Cover seeds. A heat mat will help maintain an accurate temperature. Lower temperatures will result in slower germination: 5-7 days at 70-75°F (21-24°C). Harden-off and transplant out after last frost. Do not allow plants to become root bound and avoid disturbing roots; transplant shock or other stress events may cause double-flowering varieties to produce single blooms for a period following stress. Direct seed - After last frost, sow 1/4" deep. Succession-sow/plant every two weeks for prolonged yields of high-quality stems. Pinching of initial bud or bloom and subsequent deadheading is recommended to encourage strong branching and bloom production.

LIGHT PREFERENCE: Sun.

PLANT HEIGHT: Varies. No support is necessary.

PLANT SPACING: 9-12".

HARDINESS ZONES: Annual.

HARVEST: Before completely open. Stem is firm from point of cut to just below the bloom.

SOIL REQUIREMENTS: Fertile soil rich in organic matter. pH: 6.3-6.8 preferred.

USES: Taller varieties make excellent cut flowers. Beds, borders, and mass plantings.

SCIENTIFIC NAME: Zinnia spp.