https://pfaf.org/USER/Plant.aspx?LatinName=Vernonia+glauca
Vernonia glauca is a PERENNIAL growing to 1.5 m (5ft). See above for USDA hardiness. It is hardy to UK zone 3. It is in flower from July to August. The species...
vernonia glaucaplant databaseironweedbroadleafpfaf