Name: Cornflower, Centaurea
Quantity: 250 Bulk Seeds/bag
Buy Now
Height: 12-36 in. (40-90 cm)
Flower Color: Mixed
Plant Type: Annuals
Requirements: Full sunlight. Good drainage. Soil pH 5.5 to 7. Ordinary soil. Feed in spring. Regular watering. Deadhead. Stake taller species. Cut back perennials following blooming. Divide perennials in spring in cool areas or autumn in warmer areas.
Foliage: Weedy. Elongated lobes, often spiny.
Sow Outdoors: Cover seeds. Use successive sowing for continued blooms. Before last frost or autumn. Spacing 6 to 12 inches (15 to 30 cm).
Sow Indoors: Germination time: one to five weeks. Darkness. Temperature 60 to 70°F (15 to 21°C). Seven or eight weeks in advance. Transplant annuals outdoors at the end of spring. Perennials and biennials can be planted out in either late spring or early autumn.
Zones: 1-10
How to grow
If planning to grow cornflower like species outdoors then the seeds should be sown in sunny areas of the garden that have soil with good drainage, ideally the pH should be from 5.5 to 7.
It is best to sow the seeds successively from just before the last frost of spring, or in the autumn. If first growing cornflower / Centaurea species indoors then they normally take about one week to one month to germinate and should be started off about 6 or 7 weeks before you plan to put them out into the garden in the late spring.