If you’re looking for a slug-proof perennial for your garden then look no further; slugs and snails are repelled by the mint scented, felted foliage of this Giant Hyssop, so wont touch these plants! Compact and evergreen, Agastache have colour-changing flowers, which also attract bees and butterflies. These plants can be grown in either the border or containers and are very drought tolerant. Height: 60cm (24). Spread: 45cm (18).