Ageratina havanensis (Kunth) King & H. Rob.
Shrubby Boneset, White Mistflower, White Shrub Mistflower, Havana Snakeroot
Asteraceae (Aster Family)
Synonym(s): Eupatorium havanense, Eupatorium texense
USDA Symbol: AGHA4
Havana snakeroot or mistflower is a rounded shrub, 2-6 ft. tall, with many much-branched stems arising from the base. Leaf blades triangular to roughly ovate or narrower, up to 3 inches long, with 3 main veins; margins wavy to coarsely toothed, tip pointed, and the base broadly tapered to almost perpendicular. Opposite leaves hang from fairly long leaf stalks. Prolific, long-lasting, fragrant, pinkish-white flowers occur in fuzzy, terminal, ageratum-like clusters. Fruit 1/5 inch long, with a crown of bristles on one end.
Blooms best and appears bushier if severely cut back each winter. Drought tolerant. Adapt to most well-drained soils. May be transplanted year-round if cut back by one third.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Arrangement: Opposite
Leaf Complexity: Simple
Size Notes: Up to about 6 feet tall.
Leaf: Leaves often persist through winter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: White , Pink
Bloom Time: Apr , May , Jun , Jul , Sep , Oct , Nov , Dec
Native Distribution: Edwards Plateau in TX to n. Mex.; also Cuba and the Bahaman Islands
Native Habitat: Found on rocky hillsides and bluffs in the southern half of the Hill Country. Well-drained sand, loam, clay, limestone. Rocky ravines; ledges; limestone hills
Growing ConditionsLight Requirement: Sun , Part Shade
Soil Moisture: Dry
Soil Description: Well-drained, rocky, limesone soils.
Conditions Comments: White mistflower is ideal for a woodland edge. The white to pinkish-white flowers are fragrant and showy. White mistflower provides late summer and early fall color. Booms best and appears bushier if severely cut back each winter. Drought tolerant. Adapt to most well-drained soils. May be transplanted year-round if cut back by one third.
BenefitUse Wildlife: Attracts hummingbirds, moths & butterflies. Butterflies and moths love the upright, fuzzy blooms.
Conspicuous Flowers: yes
Fragrant Flowers: yes
Attracts: Butterflies , Hummingbirds
Larval Host: Rawson's Metalmark
Nectar Source: yes
Deer Resistant: Moderate
PropagationPropagation Material: Seeds , Semi-hardwood Cuttings , Softwood Cuttings
Description: Easily grown from untreated seed. Higher germination occurs with fresh seed. Readily roots from softwood and semi-hardwood cuttings taken in summer or fall. Cuttings can be taken starting as early as April, and throughout the summer and early fall on plants that have been cut back. Gallons get woody after a year in a pot.
Seed Collection: Collect achenes throughout fall when they have dried.
Seed Treatment: Air-dry seed before storing in bags and refrigerate if storing the seed for long periods of time.
Commercially Avail: yes
Maintenance: Blooms best and appears bushier if severely cut back each winter. Drought tolerant. Adapt to most well-drained soils. May be transplanted year-round if cut back by one third.
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From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Lady Bird Johnson Wildflower Center - Austin, TX
Texas Discovery Gardens - Dallas, TX
Brackenridge Field Laboratory - Austin, TX
NPSOT - Native Plant Society of Texas - Fredericksburg, TX
Texas Parks and Wildlife Department - Austin, TX
NPSOT - Fredericksburg Chapter - Fredericksburg, TX
NPSOT - Austin Chapter - Austin, TX
NPSOT - Williamson County Chapter - Georgetown, TX
Herbarium Specimen(s)NPSOT 0161 Collected May 22, 1991 in Bexar County by Lottie Millsaps
NPSOT 0983 Collected Nov 3, 1994 in Bexar County by Mike Fox
Wildflower Center Seed BankLBJWC-630A Collected 2007-11-05 in Travis County by Lady Bird Johnson Wildflower Center
BibliographyBibref 354 - Native & Naturalized Woody Plants of Austin & the Hill Country (1981) Lynch, D.
Bibref 318 - Native Texas Plants: Landscaping Region by Region (2002) Wasowski, S. & A. Wasowski
Search More Titles in Bibliography
Web ReferenceWebref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Additional resourcesUSDA: Find Ageratina havanensis in USDA Plants
FNA: Find Ageratina havanensis in the Flora of North America (if available)
Google: Search Google for Ageratina havanensis
MetadataRecord Modified: 2022-10-07
Research By: TWC Staff, mwj