Hyssopus officinalis aka Hyssop

Hyssopus officinalis, or hyssop, belongs to the mint family. Its native range spans Europe, northern Africa, and western Asia. It also grows wild in parts of the United States. Wild plants grow on stony ground, dry hills, and rock ledges. Hyssop forms a bushy perennial clump with a woody base. It can be short-lived, though its leaves last through mild winters.

Garden plants reach 1–2 feet [0.3–0.61 metres] tall. Most spread 1–1.5 feet [0.3–0.46 metres] across. RHS gives a wider spread, reaching 3.3 feet [1 metre]. The upright green stems have a square cross section. Narrow, dark green leaves grow in pairs along them. They have a glossy surface and a strong scent. Each leaf reaches about one inch long and lacks a stalk. Plants can keep their foliage through winter in warm climates.

Blue to purple flowers grow in clusters along tall spikes. Each scented flower forms a tube with two lips. The stamens extend beyond the petals. Bloom lasts through summer and may extend into early autumn. Bees, butterflies, and other helpful insects visit the flowers. Hummingbirds also come to them. The blooms suit fresh bouquets and dried flower displays. Hyssop adds flowers and scent to herb gardens and borders.

Grow hyssop in sun and soil that drains well. Some afternoon shade helps where summers bring strong heat. Fertile loam suits it, but poor sandy soil also works. It accepts neutral or alkaline soil and dry, rocky sites. Regular watering supports growth, though settled plants withstand dry spells. NCSU lists USDA zones 4–9; RHS gives a rating of H7. Trim plants in spring to keep their shape compact. Seeds, cuttings, and division offer ways to raise new plants. Hyssop also seeds itself in gardens.

Use it for low hedges, edging, rock gardens, or pots. Planting on slopes can help hold soil in place. Deer tend to leave established plants alone. Serious pest and disease trouble is rare. Leafhoppers and nematodes can still cause problems. Leaves and young shoot tips can flavour soups and salads. Eat the flowers raw, or dry blooms and leaves for potpourri. The oil has uses in perfume, food flavouring, and liquor. Hyssop also has a history of use in folk medicine. Its concentrated oil can cause convulsions and poses a risk with epilepsy. Rare digestive upset is also reported.