Hardy Hibiscus, Rose Mallow, Swamp Mallow 'Lord Baltimore'

Hibiscusmoscheutos

Family
Malvaceae (mal-VAY-see-ee)
Genus
Hibiscus (hi-BIS-kus)
Species
moscheutos (mos-KEW-tos)
Synonym
Spacing
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
Hardiness
24-36 in. (60-90 cm)
Sun Exposure
USDA Zone 5a: to -28.8 °C (-20 °F)
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)
Bloom Color
Sun to Partial Shade
Bloom Time
Foliage
Red
Other Details
Other details
Mid Summer
Late Summer/Early Fall
Propagation Methods
Herbaceous
Seed Collecting
Soil pH requirements
From seed; direct sow outdoors in fall
From seed; stratify if sowing indoors
Direct sow as soon as the ground can be worked
From seed; sow indoors before last frost
From seed; direct sow after last frost
From seed; germinate in a damp paper towel
From seed; germinate in vitro in gelatin, agar or other medium
Scarify seed before sowing
Patent Information
Foliage Color
Collect seedhead/pod when flowers fade; allow to dry
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
Bloom Characteristics
Water Requirements
Where to Grow
Regional

This plant is said to grow outdoors in the following regions:

Montgomery, Alabama

Peoria, Arizona

Tucson, Arizona

Yuma, Arizona

Fayetteville, Arkansas

Fallbrook, California(5 reports)

Fresno, California

Grass Valley, California

Loveland, Colorado

Altamonte Springs, Florida

Gainesville, Florida

Homosassa, Florida

Jacksonville, Florida

Valrico, Florida

Milledgeville, Georgia

Champaign, Illinois

Charleston, Illinois

Chicago, Illinois

Mount Prospect, Illinois

Peoria, Illinois

Plainfield, Illinois

Albion, Indiana

Atalissa, Iowa

Tompkinsville, Kentucky

Calhoun, Louisiana

Coushatta, Louisiana

Kentwood, Louisiana

Marrero, Louisiana

Youngsville, Louisiana

Zachary, Louisiana

South Berwick, Maine

Upper Marlboro, Maryland

Attleboro, Massachusetts

Dracut, Massachusetts

Roslindale, Massachusetts

Topsfield, Massachusetts

West Stockbridge, Massachusetts

Dearborn Heights, Michigan

Saint Louis, Missouri

Omaha, Nebraska

Point Pleasant Beach, New Jersey

Bellmore, New York

Croton On Hudson, New York

Mount Vernon, New York

Raleigh, North Carolina

Wilmington, North Carolina

Cleveland, Ohio

Columbus, Ohio

Garrettsville, Ohio

Pickerington, Ohio

Oklahoma City, Oklahoma

Talala, Oklahoma

Stayton, Oregon

Allentown, Pennsylvania

Coopersburg, Pennsylvania

Lansdowne, Pennsylvania

Roscoe, Pennsylvania

Tionesta, Pennsylvania

Wakefield, Rhode Island

Bluffton, South Carolina

Conway, South Carolina

North Augusta, South Carolina

Plum Branch, South Carolina

Fairview, Tennessee

Middleton, Tennessee

Rockvale, Tennessee

Summertown, Tennessee

Austin, Texas(2 reports)

Belton, Texas

Broaddus, Texas

Coppell, Texas

Copperas Cove, Texas

Georgetown, Texas

Iredell, Texas

Kyle, Texas

Leander, Texas

Lubbock, Texas(2 reports)

Nederland, Texas

Oakhurst, Texas

Royse City, Texas

San Antonio, Texas(2 reports)

Temple, Texas

Portsmouth, Virginia

Vienna, Virginia

Grand Mound, Washington

Olympia, Washington

Puyallup, Washington

Rochester, Washington

Seattle, Washington

Martinsburg, West Virginia

Eau Claire, Wisconsin

Milwaukee, Wisconsin

Mukwonago, Wisconsin

Sauk City, Wisconsin

Sussex, Wisconsin

show all

Featured Videos

Gardener's Notes:

15
positives
2
neutrals
0
negative
Sort By:
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Y
Y
Leander, TX (Zone 8a) | June 2020 | positive

We are in Leander, TX - Zone 8a/8b. Our first bloom was in early June. This the third summer the hibiscus is in the garden.

...Read More

V
Portsmouth, VA (Zone 8a) | August 2016 | positive

Lord Baltimore, is a big hibiscus getting about 6 feet tall and wide. It is a sterile hibiscus too so it puts all it's energy into bloomi...Read More

C
ROSLINDALE, MA | March 2014 | positive

This is a fantastic perennial, with exotic, tropical-looking crimson flowers over a long season from late summer into early fall. Like al...Read More

P
| February 2013 | positive

we have three kinds of hibiscus here (Sarnia, Ontario, N7S 4C8)
1) rose of sharon-light green, spade shaped leaves, various types<...Read More

S
Ponte Vedra Beach, FL | September 2011 | positive

Until this year all of my hibiscus have produced beautiful blooms 9 out of 12 months. Mine have made it through multiple freezes, includi...Read More

B
Irving, TX (Zone 8a) | July 2011 | positive

This hibiscus is a strong performer in my yard. Althought mine started flowering later than others in the area this summer it grew huge ...Read More

P
| August 2010 | positive

I have just bought one of these magnificent plants and am in zone 3! I believe it is hardy enough to winter over. I have it in a pot ri...Read More

A
Topsfield, MA | July 2010 | neutral

I just bought this from a grower in Kennebunkport Maine. It winters over outside with no special treatment!

M
Fairview, TN | October 2008 | positive

This is the second year I have had this plant. It was 8 ft. tall and 9 ft. wide. Covered most of the summer with giant blooms. I did ha...Read More

G
(Zone 5a) | August 2006 | positive

My favorite Hibiscus - no pale pink here! My information says hardy up to zone 10. Soaking seed aids germination. Slow to break dorman...Read More

F
Lakes of the Four Seasons, IN (Zone 5a) | September 2005 | positive

Incredible Hibiscus! I planted two of these side by side. Now, in their second summer they are over 6 feet tall, and the brilliant red bl...Read More

K
Shawnee Mission, KS | July 2004 | positive

The Rose Mallow 'Lord Baltimore' is easy even for someone without a green thumb. Mine doubled in size in just one season. I would like ...Read More

M
Tompkinsville, KY | July 2004 | positive

I have had this plant for several years and it's a reliable bloomer, here in southern Kentucky, with very large blooms...except for the o...Read More

W
Olympia, WA | September 2003 | positive

Incredible blossoms!!!!! Fast grower! No green bugs here, but brown cloven hooved animals - AKA DEER - like to feast on this one!

K
| July 2003 | neutral

Second year since I bought mine, second year the leaves have been decimated by some kind of small green worm. Small but FAST working, an...Read More

G
Spartanburg, SC | July 2003 | positive

Big blooms as big as dinnerplates here in Spartanburg SC. Likes a lot of water and grows to 5-6 feet. Beautiful!!

H
Venice, FL (Zone 7a) | February 2003 | positive

Beautiful blooms all summer. Heavy blooms may need support.(I use fishing line to a fence so it can't be seen easily)

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