Excerpt - page 1: "... of the range in northern areas; have seen 8' high plants in the South. HARDINESS: Zone 5 as a herbaceous perennial but best in Zone 6 to 9, -5 to ..."
Excerpt - page 32: "... When first introduced, this species was not identified and the plant was named 'Blue Haze', but ... so Acanthus species, ranging from herbaceousplants to shrubby trees, many are found in tropical Africa ..."
