Blacknight Hollyhock
Alcea rosea 'Blacknight'
Walter's Gardens
Spotlight Series
$15.00 – $25.00
Featuring deep black-purple flowers on towering spikes in midsummer; tolerant to the natural toxin formed by the roots of Black Walnut; selections from this series are truly perennial; plant in full sun for better growth
Features and Growing Tips
Note: Each live plant is unique and may differ from the photo while maintaining its beauty. Plants come in a plastic pot; other items in images are not included.
Landscape Qualities
Blacknight Hollyhock is an herbaceous perennial with a rigidly upright and towering form. Its relatively coarse texture can be used to stand it apart from other garden plants with finer foliage.
Ornamental Qualities
Blacknight Hollyhock features bold spikes of black round flowers with white eyes and deep purple streaks rising above the foliage from mid to late summer. The flowers are excellent for cutting. Its large tomentose round leaves remain grayish green in color throughout the season.
Planting and Growing
Blacknight Hollyhock will grow to be about 4 feet tall at maturity extending to 6 feet tall with the flowers | with a spread of 24 inches. It tends to be leggy | with a typical clearance of 1 foot from the ground | and should be underplanted with lower-growing perennials. The flower stalks can be weak and so it may require staking in exposed sites or excessively rich soils. It grows at a fast rate | and under ideal conditions can be expected to live for approximately 10 years. As an herbaceous perennial | this plant will usually die back to the crown each winter | and will regrow from the base each spring. Be careful not to disturb the crown in late winter when it may not be readily seen!
This plant should only be grown in full sunlight. It prefers to grow in average to moist conditions | and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selected variety of a species not originally from North America.
Plant Facts
Prefers full sun
Deer Resistant
Keep moisture level average to moist
Mature Size 4'(6'withtheflowers)Hx24"W
Cutflower Favorite
Flowers are black
Flowers from mid to late summer
Attracts hummingbirds
Zone 3a
Likes average to moist soil