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A perennial often grown as a biennial
Malvaceae
Plantes vivaces ornementales
Hollyhock 'Blacknight'
Hollyhock
Hollyhock 'Blacknight': 180 cm high and 60 cm spread, full sun. Purple, black flowers in July. Zone 3; choose soil compatible with its moisture needs.
- Exposure
- Sun
- Life cycle
- Often grown as a biennial, this perennial
- Hardiness
- Zone 3
Discover the plant
Common nameHollyhock 'Blacknight'
FamilyMalvaceae
GenusHollyhock
Speciesrosea
CultivarBlacknight
TypeA perennial often grown as a biennial
Botanical nameHollyhock
The silhouette of Hollyhock ‘Blacknight’ (Alcea ‘Blacknight’) adds dimension to garden compositions. Its foliage features shades of green, to be highlighted among different textures. The usual flowering period is in July. The clump grows to approximately 180 cm in height with a 60 cm spread; use these dimensions to position the plant at the back of a border and as a focal point.
Soil choice is essential for Hollyhock ‘Blacknight’: well-drained garden soil that retains moderate moisture during establishment. The preferred exposure is full sun. Support the rooting of Hollyhock ‘Blacknight’ with deep watering, then check the moisture before watering again. Adjust the frequency to rainfall and heat; avoid small daily applications on already moist soil. A spacing of approximately 60 cm between centers is a starting guideline, to be adjusted according to observed vigor. The indicated hardiness level is zone 3, to be evaluated according to your garden's conditions.
Throughout the seasons, Hollyhock ‘Blacknight’ benefits from timely care: remove affected leaves and ensure good air circulation; a mature plant may need support in an exposed site. Place hollyhocks away from strong winds and monitor for rust on the undersides of the leaves. For companion planting, consider perennial geraniums, campanulas, and echinaceas in varieties with similar needs. By composing around its volume of 180 cm by 60 cm, you will preserve the visibility of its bloom (July) and the circulation between plants.
Planting guide
From planting to establishment.
Best planting time
Spring after the thaw or early autumn, allowing time for the roots to settle before the severe cold.
Growing method
Hollyhock ‘Blacknight’: Spring after the thaw or early fall, allowing the roots time to establish before the deep cold. Support the establishment of Hollyhock ‘Blacknight’ with deep watering, then check the moisture before watering again. Adjust the frequency according to rain and heat; avoid small daily waterings on soil that is already moist. Place hollyhocks in an area protected from strong winds and monitor for rust on the undersides of the leaves.
Soil and care
The right care,at the right time.
Soil pH
Acid to neutral to alkaline; general indication of the botanical group
Care level
Regular maintenance
Drought tolerance
Yes
Watering
Water Hollyhock 'Blacknight' deeply to help it establish, then check the moisture before watering again. Adjust frequency based on rain and heat; avoid small daily waterings if the soil is already moist.
Soil type
Drained garden soil, retaining moderate moisture during installation
Fertilization
Fertilizer for flowering
Moisture
Moderate humidity; water according to the actual state of the root ball
Seasonal care
Hollyhock 'Blacknight': remove affected leaves and ensure good airflow; a mature plant may need staking in an exposed site. During its flowering period (July), also check for damaged stems and nearby plants that could overshadow the clump.
Container growing
A garden,within reach.
To try out Blacknight Hollyhock in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (60 cm). Water must drain freely after each watering; check the root ball more often than you would for plants in the ground. Plan to protect the container in winter depending on your climate.
Bloom and dimensions
Its place,in your garden.
Mature height
180 cm
Width / spread
24 inches (61 cm)
Flower color
Purple
Foliage color
Green
Growth rate
Fast
Bloom period
July
Harvest
Coupe de tiges florales pour les bouquets; usage décoratif.
Garden associations
In goodcompany.
Companion plants
Associations to consider for ‘Blacknight’ Hollyhock: perennial geraniums, campanulas, echinaceas. Choose varieties that tolerate sun and comparable moisture; allow each clump its adult space.
Frequently asked questions
Your questions,answered.
Where to plant Hollyhock ‘Blacknight’?
Expect sun and suitable soil (drained garden soil, retaining moderate moisture during establishment). Place hollyhocks away from strong winds and monitor the undersides of the leaves for rust.
Where should I plant Hollyhock ‘Blacknight’?
Expect a height of about 180 cm and a width of 60 cm at maturity. Approximately 60 cm between centers, to be adjusted according to the actual development of the clump. This size is suitable for use at the back of a border and as a focal point.
When does Hollyhock 'Blacknight' bloom?
The indicated period is July. The color palette of the flowers is purple, black. The exact date and duration depend on the climate, the season, and the plant's establishment.
How to water and care for Hollyhock 'Blacknight'?
Help hollyhocks 'Blacknight' establish themselves with deep watering, then check the moisture before watering again. Adjust frequency based on rain and heat; avoid small daily waterings on already moist soil. Remove affected leaves and ensure good air circulation; a mature plant may need support in an exposed site.
Can ‘Blacknight’ Hollyhock be grown in a pot?
To try 'Blacknight' hollyhock in a container, choose a stable pot with drainage holes, suitable for the root ball and its future size (60 cm). Water must drain freely after each watering; check the root ball more often than you would for plants in the ground. Plan to protect the container in winter depending on your climate.
Wildlife and pets
Life,around your plants.
Supporting wildlife
Les fleurs attirent les abeilles, les papillons et les colibris. Pour observer ces visites, gardez une vue dégagée sur les fleurs depuis un passage accessible. Les observations varient avec la météo, la floraison et l’activité des animaux présents. Suivez les fleurs au fil de leur ouverture et laissez de la place pour les observer sans piétiner les racines.
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