Eupatorium altissimum
TAXONOMY
FamilyAsteraceae
GenusEupatorium
Zone4
LEARN MORE
Plants of the World OnlineABOUT
Eupatorium altissimum, commonly known as Tall Thoroughwort, is a perennial herb in the Asteraceae family. It is native to North America and typically found in prairies, open woods, and along roadsides. The plant can grow up to 1.5 meters tall and produces clusters of small white flowers. It undergoes a dormancy period during the winter months.
ALSO KNOWN AS
Tall Boneset
Uncasia Altissima
Eupatorium elatum
Eupatorium floridanum
Eupatorium ramosum
Eupatorium rupestre
Eupatorium saltuense
OVERVIEW
VPDCalculate
WaterDry
SoilLoamy
LightDirect Bright (6 Hours)
Temperature20° C
Humidity50%
Dormancy3 Months
pH6.5
Pressure1,013 mbar
DETAILS
Care Instructions
Tall Thoroughwort prefers full sun and moderate temperatures. It thrives in well-drained soil and can tolerate dry conditions. Regular watering is necessary during prolonged dry spells. The plant benefits from moderate humidity and should be protected from extreme cold.Soil
Eupatorium altissimum prefers loamy soil that is well-drained. It can tolerate a range of soil types but performs best in moderately fertile soil. Ensure good drainage to prevent root rot.Fertilizer
Use a balanced fertilizer with an N-P-K ratio of 10-10-10. Fertilize in early spring and again in mid-summer to support growth and flowering. Avoid over-fertilizing as it can lead to weak stems.Repotting
Repotting is generally not necessary for this outdoor plant. However, if grown in containers, repot every 2-3 years to refresh the soil and provide more space for root growth. Repot in early spring before new growth begins.Propagation
Propagate by division in early spring or by seed. For division, dig up the plant and separate the root clumps, then replant them. Seeds can be sown directly in the garden in late fall or early spring.Pruning
Prune in late winter or early spring to remove dead or damaged stems and to shape the plant. Regular pruning encourages bushier growth and more abundant flowering. Deadhead spent flowers to promote continuous blooming.Toxicity
Eupatorium altissimum is not known to be toxic to pets or humans. However, as with all plants, it is best to prevent ingestion by pets and children.Additional
Tall Thoroughwort is a valuable plant for pollinators, attracting bees, butterflies, and other beneficial insects. It is also deer-resistant, making it a good choice for gardens in areas with high deer populations.REVOLUTIONIZE YOUR PLANT CARE
Make Every Plant Smart
Plant Monitor
STAYS IN YOUR PLANT
Accurately measures the core metrics of your plant – soil moisture, light, temperature and humidity - as well as compound metrics such as Vapor Pressure Deficit (VPD) and Growing Degree Days (GDD).
Shop Now
