Perennial – Common White Snakeroot

Common White Snakeroot 

Botanical name: ageratina altissima 

Beginner friendly?: moderate 

Average size at maturity: up to 5 ft in height with a 2-4 ft spread 

Hardy zone: zones 3-8 

Growth rate: reaches fully mature size in 1-3 growing seasons 

Foliage color: green 

Flower color: white 

Bloom time:  summer 

Pruning instructions: deadhead withered blooms and foliage as needed

Propagation methods: propagate by seed sowing 

Landscape use: shade gardens, rain gardens, wildflower gardens 

Special features: shade tolerant, deer resistant 

Light needs: 3-6 hours of sun per day 

Watering instructions: keep soil consistently moist 

Fertilizing instructions : use a slow-release fertilizer once a year in the early spring 

Best time to plant: spring, summer 

Best type of soil:  chalky, loam 

Companion plants: ironweed, woodland sunflower, golden alexanders 

Toxicity level: toxic for humans and pets if ingested 

Invasive species: yes