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Corncockle 'Bianca' Seeds
Once a common sight in British cornfields, the Corncockle has become a rare garden treasure. 'Bianca' is the stunning pure white form of this wildflower, producing large, open trumpets with silky petals that seem to glow against their slender, silver-grey stems.
This is a plant of grace and movement. It doesn't form a heavy clump; instead, it sways gently in the breeze, weaving its way through other plants. It is the perfect choice for a "Moon Garden" or a white border, where its luminous blooms catch the low evening light. It is incredibly easy to grow, beloved by bees, and adds a touch of wild, timeless romance to any space.

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Understanding the Plant

Agrostemma githago 'Bianca' is a robust Hardy Annual (H7). As a selected white form of the heritage 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 wildflowers in spring, the secret to the most architectural plants is September sowing. Autumn-sown 'Bianca' 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.
The "Weaving" Habit: Unlike bedding plants that form dense mounds, Corncockle has a slender, wiry framework. It is biologically designed to "weave" through taller grasses or companion plants, which provide natural structural support. This creates a translucent, layered look that adds depth and movement to a cottage border.

Growing Guide

Corncockle is one of the easiest plants to raise from seed, but it does have one specific requirement: it hates being moved.
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. Because of its sensitive taproot, direct sowing into its final position is essential. Scatter the seeds onto finely raked soil and cover with approximately 1cm of soil. Germination is typically rapid, occurring within 7-14 days.
Where to Plant:They demand full sun and thrive in poor, well-drained soil. Over-feeding or planting in heavily manured ground will lead to soft, excessive leafy growth and weak stems that are prone to flopping. Space plants 20cm apart to allow them to interweave and support one another naturally.
Ongoing Care:As 'Bianca' can reach heights of 90cm, we recommend providing light twiggy support early in the season if growing in an exposed or windy location. Deadheading spent flowers will encourage a longer blooming period, though leaving a few seed heads at the end of the season will allow the plant to self-seed and return year after year.

Plant Specifications

Botanical Name

Agrostemma githago 'Bianca'

Common Name
White Corncockle

Plant Type
Hardy Annual

Hardiness

H7 (Ultra Hardy)

Light Requirements
Full Sun ☀️

Height
60cm - 90cm

Spread
30cm

Spacing
Plant 20cm apart

Flowering Period
June to August

Perfect For
Luminous "Moon Gardens" High-Quality Nectar for Bees Naturalistic Meadow Style✂️ Elegant Cut Flowers

Seeds per Packet
Approximately 100 seeds

Beautiful Garden Combinations

The luminous white trumpets of 'Bianca' work spectacularly with partners from our available range:

☁️ Ammi majus: The White Cloud. This is the ultimate sophisticated white-on-white pairing. The delicate, lacy umbels of Ammi majus (Bishop's Flower) provide a frothy backdrop that allows the larger trumpet blooms of 'Bianca' to shine. Together, they create a dreamy, multi-layered "Moon Garden" effect that glows at dusk.

Cornflower 'Blue Ball' : The Meadow Classic. Recreate a traditional British wildflower meadow by pairing the pure white Corncockle with the electric blue Cornflower. This high-contrast combination is timeless, providing a high-quality nectar source for a vast array of bumblebees and butterflies.

Sowing & Flowering Calendar

Direct sow in autumn for the strongest plants, or in spring for a delicate harvest of white trumpet blooms from early to mid-summer.

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Direct Sow

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Flowering

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⚠️ Toxicity WarningAll parts of the Corncockle plant, especially the seeds, are poisonous if ingested. We recommend wearing gloves when handling and taking care in gardens frequented by pets prone to chewing foliage.

Biodiversity Hero
Known for its stamina and ability to thrive in poor soils, Agrostemma githago 'Bianca' is an essential choice for those wanting to create a romantic, low-maintenance wildflower display that supports long-tongued British pollinators.
Brand:Bishy Barnabees Cottage Garden LtdCategory:AnnualSKU:CRN-BIATags:Bishy Barnabees Cottage Garden Ltd, Shopify Collective