Alcea rosea ‘Nigra’ seed | Black Hollyhock

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Alcea rosea 'Nigra' seed | Black Hollyhock

LATIN NAME: Alcea rosea ‘Nigra’ COMMON NAME: Black Hollyhock

Botanical Profile

Black hollyhock is a striking cultivated selection of common hollyhock, itself native to a wide area spanning southeastern Europe and Asia, growing as a tall, stately biennial with broad, rounded leaves and towering flower spikes lined with large, single blooms in a deep, near-black maroon that appears genuinely black in low light. Like other hollyhocks, it typically produces only foliage in its first year, sending up its dramatic flower spike in the second season before setting seed and dying.

Science & Conservation

The deep, near-black colouring of this hollyhock selection comes from an unusually high concentration of dark anthocyanin pigments, and breeders working with hollyhock and other ornamental plants have studied the genetics behind achieving such intensely dark, near-black flower colours, a challenging breeding goal across many ornamental plant groups since true black pigmentation is rare in nature. Its striking colour has also made it a popular subject in modern “black garden” design trends, a horticultural style studied within contemporary garden design literature.

Landscape & Practical Uses

Black hollyhock provides dramatic, near-black vertical colour for cottage garden borders and themed dark or gothic-style plantings, its towering flower spikes creating genuine visual drama against lighter-coloured companion plants. Like other hollyhocks, it works particularly well against a sunny wall or fence where its tall stems can be supported and its striking flowers viewed at close range.

Growing From Seed

Sow the seed into a loose, well-drained mix at a shallow depth, keeping it consistently moist until germination. Full sun suits this classic cottage garden biennial well, and remember that flowering typically occurs only in the plant’s second year, so patience through the first season of foliage-only growth is part of growing hollyhocks successfully.

Our Take

We think this is one of the most striking plants in our whole flower catalogue for anyone building a dark or dramatic border theme – just be prepared for the two-year wait before the payoff, since that patience is non-negotiable with hollyhocks.

Herb Seeds / Herb