https://pfaf.org/USER/Plant.aspx?LatinName=Apium+graveolens+rapaceum
Apium graveolens rapaceum is a BIENNIAL growing to 0.6 m (2ft). See above for USDA hardiness. It is hardy to UK zone 6 and is not frost tender. It is in flower...
apium graveolens rapaceumplant databaseceleriacpfaf