blue bush Caryopteris England english flowers garden Great Britain Lamiaceae plant shrub downland herb natural nature purple summer Sussex thyme thymus wild clipped hedge national trust Nymans Perovskia plants spikes topiary tree aromatic-shrub Australian Australian-native-flora blooms blossom bracts calyces calyx color colored colors colour coloured colours display displayed evergreen flora flower flowering foliage full-bloom hardy large-flowers magnificent-mint-bush magnificent-prostanthera native perennial prostanthera prostanthera-magnifica purplish-red-calyces sepals spreading-shrub two-tone-purple Western-Australian-native-flora wildflower wildflowers adaçay anti-fungal antiseptic aromatic broadleaf-sage common-sage culinary culinary-sage deodorant deodorising digestive-properties downy garden-sage green health-benefits healthy herbaceous-perennial herbal-extracts kitchen-sage leaves maramia medicinal mint-family pharmacological-properties purple-sage sage salvia salvia-leucantha salvia-officinalis spice subshrub tonic true-sage velour-white velvety vitamin-rich white wrinkled