Cornflower Polka Dot Mixed
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Description
Cornflower 'Polka Dot Mixed' Seeds
Why choose just one colour when you can have them all? 'Polka Dot Mixed' is a cheerful kaleidoscope of cornflower colours—blues, pinks, whites, deep maroons, and soft lilacs all tumbling together in one delightfully informal display. This mix captures that wild, free-spirited cottage garden vibe in bucket loads, looking like a patch of wildflowers has simply appeared in your border.
This variety is naturally more compact and bushier than the taller 'Ball' types, making it perfect for containers, patio pots, path edges, and the front of borders. The multi-branching stems produce an abundance of flowers that are ideal for small, charming posies. Like all cornflowers, it's a fantastic cut-and-come-again variety—the more you cut, the more it blooms. Incredibly easy to grow, beloved by bees and butterflies, and endlessly cheerful—this is the perfect choice for adding instant cottage garden charm to smaller spaces.
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🌿 Understanding the Plant
Centaurea cyanus 'Polka Dot' is a robust Hardy Annual (H7). As a dwarf-selection form of the British native wildflower, it is perfectly adapted to the UK climate, surviving temperatures as low as -20°C. While heritage cornflowers can reach over 1 metre, 'Polka Dot' is specifically bred for a compact, mounded habit, typically topping out at 50cm.
The "Autumn Secret": While many gardeners sow Cornflowers in spring, the secret to the most floriferous plants is September sowing. Autumn-sown 'Polka Dot' plants develop massive, resilient root systems over winter and burst into bloom weeks earlier than spring-sown counterparts, providing a low, dense carpet of multi-coloured flowers from early summer.
A Generous Self-Seeder: Cornflowers are one of the best species for naturalizing. If you allow the final flower heads of the season to remain on the plant, they will disperse seeds that readily germinate the following spring—often appearing in delightful, unexpected gaps between paving stones or at the edges of garden paths.
🌱 Growing Guide
Cornflowers are among the easiest plants to raise from seed, providing a high kaleidoscope of colour for very little effort.
How to Sow:
Direct sow outdoors in September or October for the earliest blooms, or in March to May for a continuous 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 lightly (approx. 1cm deep). Germination typically occurs within 10-14 days.
Where to Plant:
They demand full sun and thrive in almost any well-drained soil. Paradoxically, Cornflowers perform better in average, "hungry" soils. Over-feeding or planting in heavily manured ground will lead to soft leafy growth and weak stems. This compact variety is the ideal choice for window boxes, path edges, or front-of-border positions.
Ongoing Care:
As 'Polka Dot Mixed' is a dwarf variety, it rarely requires structural support. Regular harvesting for small posies or deadheading spent flower heads weekly is essential to stimulate the plant into producing fresh buds; if left to set seed too early, the plant will stop flowering. For a continuous display, sow a small batch every 3-4 weeks throughout the spring.
📋 Plant Specifications
| Botanical Name | Centaurea cyanus 'Polka Dot Mixed' |
| Common Name | Dwarf Mixed Cornflower |
| Plant Type | Hardy Annual |
| Hardiness | H7 (Ultra Hardy) |
| Light Requirements | Full Sun ☀️ |
| Height | 40cm - 50cm |
| Spread | 20cm - 30cm |
| Spacing | Plant 20cm apart |
| Flowering Period | June to September |
| Perfect For | 🪴 Sunny Containers & Window Boxes 🐝 High-Quality Nectar for Bees 🧱 Front-of-Border Kaleidoscope 🥗 Multicoloured Edible Garnishes |
| Seeds per Packet | Approximately 200 seeds |
🤝 Beautiful Garden Combinations
This colourful dwarf mix acts as its own rainbow, but it pairs spectacularly with these available partners from our range:
- ☁️ Ammi majus: The Texture Match. The tall, lacy white umbels of Ammi majus provide a soft, neutral backdrop that ties all the vibrant 'Polka Dot' colours together. This creates a professional, multi-layered "wild meadow" display where the lower cornflowers pop against the airy white lace.
- 🐰 Bunny Tails Grass: The Tactile Pair. The soft, fluffy white seed heads of Bunny Tails (Lagurus ovatus) add wonderful movement and a tactile element to the planting. Since both are compact and love poor soil, they are the perfect duo for a designer container display on a sunny patio.
📅 Sowing & Flowering Calendar
Direct sow in autumn for the strongest plants, or in spring for successional waves of multi-coloured blooms through the summer.
🐝 Wildlife Champion
Cornflowers are a superstar plant for biodiversity. As an RHS Plant for Pollinators, 'Polka Dot' 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 'Polka Dot Mixed' is an essential choice for those wanting to create a romantic, low-maintenance garden that provides high-quality dwarf stems for the vase.
📖 Want more detailed growing advice?
View our Complete Growing Guide for Annuals →
Delivery & Returns
Delivery:
Delivery to mainland UK is calculated at checkout. For all other areas and large orders please ask for a quote. Orders will be sent by express next day delivery (DPD). They will be dispatched on a next working day service, with the exception of Ireland where it may take two days. Please allow up to 48 hours for delivery in the UK as the couriers may have already been and collected on the day you send your order in. Smaller orders for pouches, pockets, bags and pots may be sent via Royal Mail delivery. Please ensure you supply an email address and a mobile so you can be updated about your delivery. Should you have any problems with your delivery, please contact us at sales@naturalgrower.co.uk.Special Deliveries
Saturday or weekday morning deliveries can be arranged, but there will be a surcharge. Please contact us to request a price for either of these delivery services. If you need a parcel sending outside of the UK, please contact us for a quote.Returns:
If you are not completely happy with any product that you have ordered from us, you may return it to us in its original condition any time within 14 calendar days from the date of dispatch. Products must be returned in their original condition. Please contact us at sales@naturalgrower.co.uk to arrange a return. If you return a product by post, you will need to pay the costs of returning the product to us and obtain proof of posting.
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Gardening organically is a more affordable and long term alternative to using chemical fertilisers. Natural Grower products eliminate waste because the nutrients are slowly released to the plants as they need them. Over the long-term you save money because your soil health naturally improves, which in turn produces healthier, stronger, disease resistant plants. Chemical products may cost less financially in the short term, but they don’t provide any long-term benefits and the damage they do to the natural eco-system in the soil is costly.
Slow release for sustained growth
Organic fertilisers are broken down slowly by organisms in the soil to produce a more measured, consistent, natural release of nutrients. This results in uniform growth with strong stems and leaves, unlike chemical fertilisers which provide a sudden boost resulting in tall lanky plants. Stronger plants are more resistant to disease, and with the presence of mycorrizhal fungi to strengthen the roots, the plants, soil and fungi all work together long-term to create the perfect natural eco-system.
Love your land
The organic matter in Natural Grower will help keep your soil or compost in optimum condition, retain moisture over the dry summer months and improve the health and structure of your soil. The presence of natural Mycorrhizal fungi in our products enhances root growth, enabling plants to extract nutrients and absorb water more efficiently from the soil or compost. By using our products you will be supporting and enhancing the natural eco-system in the soil.
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