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We have been busy packing our favorite flower seeds and gearing up for another amazing year. Stay tuned for back in stock seeds and plants for 2025 plus over 75 new varieties!

Cornflower 'Jubilee Gem'
Seed Packet

Cornflower 'Jubilee Gem'

Centaurea cyanus
A lovely bright blue double-flowered variety, 'Jubilee Gem' won a Silver Medal in the AAS flower trials in 1937. They grow quickly and are soon covered with thistle-shaped flowers of royal blue. Try sowing some late fall and early spring for a long season of bouquets. Self-sows.
SKU #S329
$3.25
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Details
Approximate Seeds Per Packet
110
Lifecycle
Annual
Annual Hardiness
Hardy Annual
Mature Size
1.5' h x 10" w
Sun
Full sun
Soil
Regular, well-drained
Season
Spring to summer
Color
Bright blue
Features
Great Cut Flower
Deer Resistant
Heat or Drought Tolerant
Attracts Bees
Attracts Beneficial Insects
Notable
All-America Selections Winner
SOWING INSTRUCTIONS
Depth:
Barely cover (about 1/16").
Sprout Time:
5-20 days
Seed To Bloom:
10 weeks
Starting Indoors:
Not recommended.
Starting Outdoors:
Sow in early spring, 3-4 weeks before last frost. Can also be fall sown (Oct.) in zones 7-10.
PLACEMENT & CULTIVATION
Cornflowers are sentimental favorites and of easiest culture; the numerous bees buzzing around the blooms are a clue to their value in pollinator gardens. A favored flower for hundreds of years in England, cornflowers had many pet names, including Bluebottle and Hurtsickle, for the cordlike stems dulled the reaper's blade. At home in the cutting, veggie, border, and meadow garden, they continue in bloom if picked often for fresh and dried bouquets. Pull some edible petals to brighten salads, and freeze inside ice cubes to add a bit of beauty to summer drinks. Try an early to mid-fall sowing in September in zones 7-10 for vigorous blooming plants earlier in the season; elsewhere, they are generally sown in early spring. Self-sows.
Final Spacing:
8"
Water Requirements:
Medium Water Use
Watering Details:
Somewhat drought tolerant once established. 1" of water per week initially, then water during dry spells.
Soil pH:
Neutral to alkaline
Fertilizer:
Grows well in poorer soils. Mix in about 1/2" of compost or an organic granular fertilizer prior to planting.
Diseases & Pests:
Avoid fungal troubles by placing in a location that has good air circulation.
When to Cut for Bouquets:
Harvest when the flowers are just open.