Common hollyhock 'Nigra' (Alcea rosea 'Nigra')

Common hollyhock 'Nigra'

Also known as: Garden hollyhock 'Nigra'

Common hollyhock 'Nigra' is known for its tall, sturdy stems reaching up to 6 feet, adorned with deep maroon to black flowers that resemble old-fashioned rosettes. This striking biennial thrives in full sun and well-drained soil, often attracting pollinators like bees and butterflies. Its dramatic hue stands out in traditional cottage gardens, where it adds a touch of gothic elegance among lighter blooms.

Scientific classification

Mallows, rock-roses, and allies

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Perennial, Biennial, Annual

Lifespan

Herb

Plant Type

Summer, Early fall

Bloom Time

Fall

Harvest Time

2 m

Plant Height

75 cm

Spread

Green, Purple

Stem Color

Winter dormancy

Dormancy

Deciduous

Leaf type

20 - 35 ℃

Ideal Temperature

Care Guide for Common hollyhock 'Nigra'

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Common hollyhock 'Nigra' thrives in well-drained soil with moderate moisture, requiring weekly watering to maintain growth and support flowering. As an herbaceous perennial from temperate regions, it enjoys consistent hydration and performs best outdoors during the growing season, needing more frequent watering for vigorous blooms.

Fertilize: Common hollyhock 'Nigra' requires a balanced fertilizer (10-10-10) in early spring and another after the first flowers. Monthly fertilization during the growing season promotes growth, while compost or diluted liquid fertilizer is recommended. Water after fertilizing to enhance absorption and avoid root burn.

Pruning: Common hollyhock 'Nigra' thrives with regular pruning from early to late spring. Remove dead growth and spent blooms to encourage new shoots and prolong flowering. Pruning improves air circulation, reduces disease risk, and promotes bushier growth, leading to a healthier and more vigorous plant.

Propagation: To propagate common hollyhock 'Nigra', sow seeds just beneath the soil for light exposure, using a well-draining substrate. Maintain consistent moisture to prevent waterlogging. Thin seedlings to ensure airflow, promoting vigorous growth and blooming.

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Common Pests & Diseases

Mealybug Weevil Leaf wilting Spider mite Leafhopper Scale insect Aphid Thrips Dodder Leaf rot Dark blotch Whitefly Leaf beetle Flower wilting Flower withering Caterpillar

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