Cornflower Black Ball
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Description
Centaurea cyanus 'Black Ball' Cornflower 'Black Ball'
Despite its name, the colour isn't truly black — it's a deep, sumptuous velvet maroon-chocolate that looks like crushed blackberries, vintage velvet, the dark plum ink of a Dutch oil painting. 'Black Ball' is the moody, mysterious sophisticate of the cornflower family, and the variety that transforms a standard cottage border into something genuinely modern and elegant.
This is the cornflower for gardeners who find the standard cobalt-blue version too obvious. The double, ruffled "Ball"-type blooms are dense and substantial — far fuller than wild cornflowers — and the velvet-chocolate colour reads almost as black at a distance, while close inspection reveals the rich plum and burgundy depths within. Standing tall on silvery-green stems with characteristic feathery foliage, 'Black Ball' is one of the great cut flowers of the modern cottage garden — absolutely stunning when tumbled into a vase with white or lime-green companions. Hardy annual (H7), drought-tolerant once established, RHS Plants for Pollinators recognised, edible petals. Like all cornflowers, it produces buckets of flowers all summer long if regularly cut.
A note on growing
Cornflowers have deep taproots and resent transplanting — direct sowing is essential. Sow direct outdoors in September for the autumn-secret advantage (strong root system, much earlier and bigger flowers the following year), or in March to May for a summer display. Sow at 3mm depth in well-drained soil. Germination 14–21 days. Full sun. Lean, poor soil produces the strongest plants — rich ground gives lush leaves and floppy stems. Sandy or chalky soil is ideal. At 90cm tall, 'Black Ball' benefits from twiggy support inserted early to prevent flopping after rain. Deadhead weekly or cut regularly for the vase to keep the plant blooming until the frosts.
Where it shines
In sophisticated, moody cottage borders where the deep maroon adds gravitas and depth. As a primary cut flower for modern, designer-style arrangements — particularly outstanding combined with white Ammi or pure-white Cosmos for high-contrast "black and white" bouquets. In hot, warm-toned borders where the dark cornflower adds depth amongst reds, oranges and yellows. For autumn sowing, where the September-sown plants produce significantly bigger, more architectural specimens the following year. As a starring ingredient in any vintage or "Dutch master" planting scheme.
Plant alongside
For the timeless cutting combination, plant alongside Ammi majus — the lacy white umbels are the perfect foil for the deep velvet of 'Black Ball'. For warm-tone contrast, the burnished orange and mahogany undersides of Calendula 'Touch of Red' echo the dark notes beautifully. For an all-cornflower vintage palette, combine with the soft mauve of 'Mauve Boy' or the curated 'Black & Mauve Mix'.
Delivery
The seeds will be dispatched direct to you by Bishy Barnabees. Please allow up to 5 days for delivery.
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.
Be a smarter gardener
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.
Embrace sustainability
Natural Grower’s chemical free fertiliser products are approved organic, biodynamic and vegan. Plant-based and free from chemicals they are safe to use around wildlife, pets and children. Eco-friendly and sustainably produced in the UK. Our packaging is made from recycled plastic where possible and is all 100% recyclable. We are always happy to refill used containers, and often sell our products in reused containers or slightly damaged packaging at a reduced price. Reduce, reuse, recycle.
