It is a strongly aromatic shrub growing to 1–2 m tall. The leaves are evergreen, 2–6 cm long and 4–6 mm broad. The flowers are pinkish-purple (lavender-coloured), produced on spikes 2–8 cm long at the top of slender, leafless stems 10–30 cm long.

The species name angustifolia is Latin for "narrow leaf". The genus name Lavandula simply means lavender. Previously, it was known as Lavandula officinalis, Latin for "official lavender" or "true lavender", which is one of its common names. This indicated it was the official medicinal lavender.

English lavender is commonly grown as an ornamental plant. It is popular for its colourful flowers, its fragrance and its ability to survive with low water consumption. It does not grow well in continuously damp soil. It is fairly tolerant of low temperatures, generally considered hardy to USDA zone 5.

In addition to its use as an ornamental plant, the flowers and leaves are also used as an herbal medicine, either in the form of lavender oil or as an herbal tea. The flowers are also used as a culinary herb, most often as part of the French herb blend called herbes de Provence.

Lavender essential oil, when diluted with a carrier oil, is commonly used as a relaxant with massage therapy. Products for home use including lotions, eye pillows—including lavender flowers or the essential oil itself—bath oils, etc. are also used to induce relaxation.

Dried lavender flowers and lavender essential oil are also used as a prevention against clothing moths, which do not like their scent.

Often considered to have three groups, based on growth height characteristics - dwarf, semi-dwarf, and tall (giant) varieties.

Compacta, Folgate, Dwarf Blue, Dwarf White, Hidcote Pink, Hidcote Superior, Munstead, Nana Atropurpurea, Nana Rosea, Sarah, Summerland Surpreme, Lady Lavender

Bowles Early, Hidcote Variety, Loddon Blue, Martha Roderick, Jean Davis, Twickle Purple, Pink Perfume.

Alba, Blackhouse Purple, Biostos, Bridestowe, Graves, Gray Lady, Gwendolyn Anley, Hidcote Giant, Irene Doyle, Mailette, Middachten.