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Cornflower 'Blue Ball' Seeds
'Blue Ball' is the definitive Cornflower. It produces masses of fully double, ruffled blooms in a vivid, electric shade of azure-blue that seems to glow in the sunlight. Unlike the wispy wild variety, these flowers are dense, round, and substantial (hence the name 'Ball'). Standing tall on silvery stems with feathery foliage, this is a "cut-and-come-again" workhorse that bridges the gap between wild meadows and formal borders.
This variety looks just as good in a chaotic cottage garden as it does in a neat row in the cutting patch. Simply cut a handful of stems, drop them in a vase, and you have an instant designer arrangement. The more you cut, the more it flowers—producing buckets of blooms from early summer right through to the first frosts. Incredibly hardy, ridiculously easy to grow, and beloved by bees—this is the quintessential cottage garden flower.

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Understanding the Plant

Centaurea cyanus 'Blue Ball' is a robust Hardy Annual (H7). As a selected form of the British native wildflower, it is perfectly adapted to the UK climate, surviving temperatures as low as -20°C. It is a "cool-season" specialist, meaning it establishes its best root systems when the soil is cool in either spring or autumn.
The "Autumn Secret": While many gardeners sow Cornflowers in spring, the secret to giant plants with hundreds of flowers is September sowing. Autumn-sown 'Blue Ball' plants develop deep, resilient root systems over winter and burst into bloom weeks earlier than spring-sown counterparts, resulting in bushier, taller, and more floriferous specimens.
Cultural History: Cornflowers were once a common sight in British cornfields, growing as a "weed" among wheat and barley. This specific azure-blue was so distinctive that it became recognized as its own colour, "Cornflower Blue," widely celebrated in European art and design for centuries.

Growing Guide

Cornflowers are among the easiest plants to raise from seed, providing high reward for minimal effort.
How to Sow:Direct sow outdoors in September for early summer blooms, or in March to May for a continuous mid-to-late summer display. Cornflowers possess a deep taproot and hate being moved; for this reason, direct sowing into their final position is always the most successful method. Scatter the seeds onto finely raked soil and cover very lightly (just 3mm deep). Germination typically occurs within 14-21 days.
Where to Plant:They demand full sun and prefer well-drained soil. Paradoxically, Cornflowers thrive in poor, "hungry" soils. Over-feeding or planting in rich ground will lead to excessive, soft leafy growth and weak stems. Sandy or chalky soils are ideal for producing sturdy, upright plants.
Ongoing Care:As 'Blue Ball' can reach heights of 90cm, we recommend providing light twiggy support (hazel or birch) early in the season to prevent the plants from flopping after heavy rain. Deadheading spent flower heads weekly—or cutting them for the vase—is essential to stimulate the plant into producing fresh buds; if left to set seed, the plant will stop flowering early.

Plant Specifications

Botanical Name

Centaurea cyanus 'Blue Ball'

Common Name
Cornflower

Plant Type
Hardy Annual

Hardiness

H7 (Ultra Hardy)

Light Requirements
Full Sun ☀️

Height
75cm - 90cm

Spread
30cm

Spacing
Plant 30cm apart

Flowering Period
June to September

Perfect For
✂️ Professional Cut Flowers Bee & Butterfly Support Wildflower & Meadow Plantings Gourmet Edible Garnishes

Seeds per Packet
Approximately 200 seeds

Beautiful Garden Combinations

Electric blue is one of the most versatile colours in the garden, providing a striking contrast to warm tones and cool pastels alike:

Calendula 'Art Shades Mixed': The Vibrant Contrast. Blue and orange are opposites on the colour wheel; planting these together creates a high-energy, vibrating display that looks incredible under the summer sun. Both share a love for poor soils and can be autumn-sown together for an early summer burst.

Poppy 'Flanders Red' : The Heritage Meadow. Recreate a traditional British cornfield by mixing 'Blue Ball' Cornflowers with red field poppies. It is a timeless, rustic combination that provides high-quality nectar and evokes the romantic wildflower meadows of old England.

Sowing & Flowering Calendar

Direct sow in autumn for the strongest plants, or in spring for successional waves of electric-blue blooms through the summer.

Month
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F
M
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M
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J
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Direct Sow

✓
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Flowering

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Wildlife ChampionCornflowers are a superstar plant for biodiversity. As an RHS Plant for Pollinators, 'Blue Ball' produces high-quality, easily accessible nectar that attracts a vast array of British bees, butterflies, and hoverflies.

Robust Garden Stamina
Known for its stamina and ability to thrive on poor, sandy, or chalky soils, Centaurea cyanus 'Blue Ball' is an essential choice for those wanting to create a traditional, low-maintenance garden that provides high-quality azure stems for the vase.
Brand:Bishy Barnabees Cottage Garden LtdCategory:AnnualSKU:CRN-BLUTags:Bishy Barnabees Cottage Garden Ltd, Shopify Collective