Hardiness: USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F)
Sun Exposure: Full Sun
Bloom Color: Dark Purple/Black Maroon (Purple-Brown)
Bloom Time: Mid Summer Late Summer/Early Fall
Other details: Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow pods to dry on plant; break open to collect seeds N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed
On Apr 18, 2012, Mego27 from Louisville, KY wrote:
Started from seeds last year. Planted beside a concrete block shed in poor soil with no amendments. After an extremely mild winter in Kentucky the plant is almost 6 feet tall with numerous buds. It needs to be staked since we have had a very windy spring. I will pass along photos when it blooms!
On Aug 22, 2011, bazil323 from Cameron, WI (Zone 3b) wrote:
Wow! What amazing blooms! You'll definitely want to stake these. Mine were at least 6 feet tall and had blooms almost all the way up the stalk. I had thought they were done blooming about a week-2 weeks ago, so I was really surprised to find more blooms open today!
I'm definitely going to try to collect seeds from these and grow them in other areas/give some away to friends.
On Jul 25, 2010, CouchHogs from Rockford, IL (Zone 5a) wrote:
Taken from an excerpt from somewhere in my research.
“Black Hollyhock was described as early as 1629 by John Parkinson, as being “of a dark red-like black blood”, an apt description for the large single flowers that grace this plant in June and July. The Boston nurseryman, John B. Russ, offered seeds of “Black Antwerp Hollyhock: Althea nigra” in a forty-two page catalogue published in 1827. Although classed as a biennial, Hollyhock often lives for several years, like a perennial. Sow seeds in summer. The plants will form large rosettes of round, hairy leaves by autumn, and will bloom the following summer with stalks 6 to 8 feet tall. Hollyhocks thrive in full sun and in soils that are not too rich or wet. Zones 3-8.”
By the way, I highly recommend you stake this plant. Mine are surrounded on 3 sides by a wall behind & a bush each side. They were knocked down and bent my not-so strong winds. I have had some problems with powdery mildew-taken care of by a fungicide spray, Japanese beetles, this blue and red flying bugs that look somewhat like a moth, and leaf-miners.
On May 16, 2010, mrs_colla from Marin, CA (Zone 9b) wrote:
I planted mine form small pots last fall, and they have been growing into 7 feet tall plants, no flowers yet, fat buds yes.
The foliage is very ugly on my plant, it's rusty and has dried up leaves all over from the rust.
I will not replant it.
On Jan 17, 2008, fburg696 from Farmersburg, IN wrote:
I wish I could rate my experience with this plant as VERY POSITIVE because I really love this plant.It was one of the first plants in my garden.The color is very nice, great to have in the border.I have my whole sidewalk lined with these guys, a true sight for sore eyes.
I just can't say enough good things about this plant. I highly recommend it.
On Jun 14, 2007, gardenbugde from Smyrna, DE (Zone 7a) wrote:
I started this from seed last summer and it wintered over very well. I didn't even bother to trim it back since it wasn't that tall. It grew like gangbusters this Spring and is now almost 3 feet high. It's first flower opened on June 12th. I love the color! I've read that you should cut back to 6" in the fall. I guess I'll have to do that this year. I'm trying to get some more to grow from seed. If I get seed from mine this year, I'll be happy to share with others!
On Mar 4, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:
While I don't grow this particular named one, I do grow another "black" hollyhock- 'The Watchman'. In my humble, non-expert opinion there isn't much difference in them at all. The only differences I have noted are the fact that there are "black" single flowered varieties and also there are double flowered ones. Irregardless of what name they go by I love them!
Grown by Thomas Jefferson at Monticello, but mentioned even earlier by John Parkinson in 1629. He described this single hollyhock as being "of a darke red like blackwood. Appears black on overcast days, but will have a hint of red in the bright sun. Plant next to a white fence for a spectacular contrast. Self-seeding biennial, 5-6' tall.
One of the 'black' flowered cultivars of Hollyhock. It bears large, dark purple/maroon flowers with a pale yellow throat.
This plant has been said to grow in the following regions:
Amesti, California Emeryville, California San Mateo, California Smyrna, Delaware Plainfield, Illinois Rockford, Illinois Springfield, Illinois Farmersburg, Indiana Indianapolis, Indiana Centralia, Iowa Sageville, Iowa Lansing, Kansas Cresaptown-bel Air, Maryland Madison Heights, Michigan Webberville, Michigan Mathiston, Mississippi Ramblewood, New Jersey Granville, New York Thomasville, North Carolina North River, North Dakota Bolindale, Ohio Hulbert, Oklahoma Midwest City, Oklahoma Oklahoma City, Oklahoma Tulsa, Oklahoma Portland, Oregon Coopersburg, Pennsylvania East Sumter, South Carolina Lafayette, Tennessee Mobile City, Texas San Antonio, Texas Elwood, Utah Roanoke, Virginia Cathan, Washington Dishman, Washington Kalama, Washington Seattle, Washington Elkins, West Virginia Cameron, Wisconsin Mukwonago, Wisconsin Johnstown, Wyoming Riverton, Wyoming Sundance, Wyoming