Hyssop is a stiff, upright, leafy herb that can grow anywhere from two to four feet in height and can have a somewhat bushy appearance.
Good drainage is a must! Hyssops thrive in full sun and rarely need to be divided. Most will self-sow to spread, so deadhead by removing faded flowers to prevent seeding. Leave stems to overwinter; tip or remove new growth in early to mid-spring for more flowering stems and a more compact plant. To promote strong stems, avoid too much water once established and fertilize only once every year or two in late fall to late winter.