Hollyhock ‘Nigra’ Seeds

Towering spikes of large, single, silky flowers in a shade of maroon so deep it looks like glossy chocolate. This heritage variety creates a dramatic ‘black exclamation mark’ that demands attention in any border.

If you want to add drama, mystery, and a touch of gothic elegance to your borders, ‘Nigra’ is essential. Also known by its heritage name ‘The Watchman’, this spectacular variety produces towering spikes of large, single, silky flowers in a shade of maroon so deep it looks like glossy black chocolate.

Most hollyhocks are pastel and fluffy; ‘Nigra’ is sleek and architectural. The dark central eye and pale creamy style (the pollen part) create a stunning contrast that draws pollinators in from miles away. Whether growing against a white cottage wall or in a modern, moody planting scheme, it creates a vertical black exclamation mark that demands attention.

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Understanding the Plant

Alcea rosea ‘Nigra’ is a robust Hardy Biennial (H5). It follows the traditional cottage garden cycle: spending its first year developing a large, leafy rosette of heart-shaped foliage, and its second year exploding into the majestic 2-metre flower spikes for which it is famous.

Pollinator Magnet: Unlike double-flowered varieties where nectar is hidden, ‘Nigra’ has large, single blooms with wide-open saucers. This provides a clear “landing pad” for bumblebees and honeybees, allowing them effortless access to the high-value pollen and nectar inside.

Heritage Appeal: ‘The Watchman’ is one of the oldest recorded hollyhock cultivars, prized for centuries for its deep, pigment-rich petals. While technically a biennial, it is an excellent self-seeder; once established, it will often gently drop seeds to ensure a permanent, free colony of dark flowers returns to your garden every summer.

Growing Guide

Hollyhocks develop a deep taproot very quickly, so they perform best when root disturbance is kept to a minimum.

How to Sow:
Sow indoors in April to May or directly outdoors from June to July. If sowing in pots, use deep modules or root trainers to allow the taproot to grow straight. Sow the large seeds about 1cm deep. Keep at 15-20C; germination usually takes 14-21 days.

Where to Plant:
They demand full sun and rich, fertile, well-drained soil. ‘Nigra’ looks most spectacular when planted at the back of a border or against a warm, sunny wall. Walled gardens are ideal as they provide shelter from the wind and radiate heat back onto the plant, helping the flowers to open fully.

Ongoing Care:
To prevent “Hollyhock Rust” (orange spots), water only at the base of the plant and ensure there is plenty of air circulation around the stems. In exposed or windy UK gardens, these towering 2-metre spires will require the support of a sturdy bamboo cane to prevent them from snapping in a summer storm.

Plant Specifications

Beautiful Garden Combinations

The near-black flowers of ‘Nigra’ need light, bright partners to ensure they stand out. Pair them with these available stars:

• Cosmos ‘Purity’: The Monochrome Look. The pure white, airy saucers of ‘Purity’ provide a sharp, sophisticated contrast to the heavy, dark columns of the Hollyhock. This is a classic “designer” pairing for a high-contrast border.
• Larkspur ‘Limelight Mix’: The Zesty Lift. The greenish-white spires of ‘Limelight’ act as a visual highlight, making the deep maroon of ‘Nigra’ appear richer and warmer by comparison. Together, they create a tiered, structural display.

Sowing & Flowering Calendar

Sow in summer for architectural rosettes in Year 1, followed by towering chocolate-black spires in Year 2.

Skin Caution
The stems and foliage of Hollyhocks are covered in rough, bristly hairs that can be irritating to sensitive skin. We strongly recommend wearing gloves when staking or pruning your plants.

Heritage Garden Classic

Hollyhock ‘Nigra’ is a magnet for bees. Its wide-open, single shape allows bumblebees easy access to a wealth of pollen and nectar, making it a critical resource for pollinators in the UK summer garden.

Want more detailed growing advice?
View our Complete Growing Guide for Hollyhocks