Blacknight Hollyhock

Light Needs

Full Sun

(At Least 6 Hours Of Direct Sunlight)

Mature Height

5-6 Feet

Mature Spread

2 Feet

Growing Zones

3 to 9

Unlike other hollyhocks, which typically live only 2 years, Blacknight Hollyhock (Alcea rosea ‘Blacknight’) is a perennial version of the tall, sun-loving flowers. And you will be glad it comes back, since the flowers on Blacknight are, well, nearly as dark as night. The maroon-black blooms are the perfect frontman for a wall or fence, as the plants will come to grow 5 to 6 feet high and spread flowers across their nearly 2-foot spread.  Hummingbirds and butterflies will be thrilled when they visit the blooms.

The large, single-type flowers and round, lobed leaves of the hollyhock can evoke a cottage feel or a natural and colorful effect, depending on how you plant them. They do contrast best with a solid backdrop, and tend to need no staking if located near a fence or wall. However, feel free to place these beauties in the middle of a garden bed if you want some tall, dark color. Hollyhocks love sun and this Blacknight variety should come back each year (as a short-lived perennial) in zones 3 through 9.

Blacknight Hollyhock Care

Be sure to plant your hollyhock in a spot that receives at least 6 hours of sun a day. If you choose to plant them in an open site, be aware that the plant might need some staking while in full bloom, although the stalks are strong. The plants benefit from average soil fertility, but can grow in any soil that drains well. Regular water helps a hollyhock bloom, but established plants can handle some drought. The plants tend to grow quickly, but giving them some compost or a balanced fertilizer in spring as they reappear gives them a yearly boost.

Hollyhocks do not need deadheading, but pinching off dried-up blooms can help keep the plant looking cleaner. In fall, prune your hollyhock back to about 6 inches above the ground. Spread a thick (4- to 6-inch layer) of straw or other mulch around the ground above the roots to help protect the plant. Remove the mulch once danger of frost passes in spring. 

Blacknight Hollyhock Spacing

For a stunning black border or cottage row effect, plant several hollyhocks together. Be sure to space the young plants about a foot apart to give each room to spread in summer.