Sticky snakeroot
Ageratina adenophora · Asteraceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around sticky snakeroot and prepare for winter.
ID card
- Common name
- Fragrant eupatory or Fragrant ageratine
- Foliage
- Evergreen
- Flowering
- August to November
- Adult size
- 4.9 to 8.2 feet in height and width
- Growth
- Fast
- Hardiness
- From -9°F (mild climate)
- Origin
- Mexico
- Soil type
- Well-drained, rich in organic matter
Care
Watering
Water regularly during growth, especially in dry periods, to keep the soil moist but not waterlogged. In winter and after the plant is established, reduce watering. Avoid standing water which promotes rot.
Exposure
Place this plant in full sun or partial shade for abundant flowering. It tolerates partial shading better in very hot regions. Direct sunlight promotes compact growth and better flowering.
Pruning and cleaning
Prune lightly after flowering to maintain a harmonious shape and encourage branching. Remove spent flowers to extend blooming. In mild climates, you can rejuvenate the plant by cutting it back more severely in spring.
Fertilizer
Apply balanced fertilizer monthly during active growth (spring-summer). Reduce or stop applications in autumn and winter. An initial compost application will enrich the soil without excess nitrogen.
Soil and drainage
Grow it in rich, well-drained soil that is slightly acidic to neutral. Improve heavy soil with compost or peat to facilitate drainage. Good drainage is essential to prevent root diseases.
Diseases and pests
Watch for powdery mildew and leaf spots in overly humid conditions. Scale insects can affect the plant indoors or in greenhouses. Ensure good air circulation and avoid prolonged foliage moisture to prevent fungal problems.
Did you know?
Native to Mexico, Ageratina adenophora has naturalized in many tropical and Mediterranean regions, where it has become invasive in some ecosystems. Its foliage releases a characteristic slightly sharp aroma when crushed, hence its name 'fragrant' which evokes this distinctive olfactory feature.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
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Tips generated and checked by Viridia — adapt them to your local climate.