Common sage

Family

Lamiaceae

Habit

Shrub

Height

0.6 m

Spread

0.6 m

Growth

medium

Lifespan

10 years

First yield

after 2 years

Hardiness

zone 5–9

Shade tolerance

full sun

Soil

Sand, Silt

Soil moisture

very dry – very moist

pH

7 – 8.1

Edible: Leaves and flowers – raw or cooked. This widely used herb, with its strongly aromatic leaves, is used to season foods. It aids digestion and therefore goes well with strong, fatty dishes. Savoury dishes are given a sausage-like flavour by it. Young leaves and flowers can be used raw, cooked, pickled or in sandwiches. The flowers are also suitable as a garnish for salads, lending them colour and fragrance. A herbal tea is made from fresh or dried leaves, said to aid digestion. The essential oil obtained from the plant is used industrially to flavour ice cream, sweets, baked goods etc.

Medicinal: Sage has a long history of effective medicinal use and is an important household remedy for digestive complaints. Its antiseptic properties make it an effective gargle, which can relieve sore throats, ulcers etc. Leaves applied to an aching tooth can also bring relief. The whole herb is antihidrotic (sweat-reducing), antiseptic, antispasmodic, astringent, carminative, bile-flow-stimulating, lactagogue, stimulating, tonic and vasodilator. Sage is also taken internally to treat excessive milk flow, night sweats, increased salivation (as in Parkinson's), heavy sweating (as in tuberculosis), anxiety, depression, female infertility and menopausal complaints. Many herbalists believe that the purple-leaved forms of this species possess stronger medicinal effects. This remedy should not be given to pregnant women or people with epilepsy. The plant is toxic in high doses or with prolonged use – the toxic dose, however, is very high. Externally it is used to treat insect stings, skin, throat, mouth and gum inflammations as well as vaginal discharge. The leaves are best harvested before flowering and dried for later use. The essential oil of the plant is used in small doses to loosen stubborn mucus in the airways and in liniments to treat rheumatism. In higher doses, however, it can trigger epileptic seizures, dizziness etc. The essential oil finds application in aromatherapy. Its key word is 'tonic'.

Other uses: Sage leaves serve for cleaning teeth: rub the upper side of the leaf over teeth and gums, the antiseptic effect also easing mild gum inflammation; purple-leaved forms have firmer leaves and suit the purpose better. An essential oil is obtained from the leaves, used in perfumery as a highly effective fixative, in hair shampoos for dark hair, as a food flavouring and in toothpaste. Dried and powdered, sage is an ingredient of herbal compost activators that speed up bacterial activity in the heap. Fresh or dried the plant is held to repel insects and is traditionally set between cabbage and carrots; it was once used as a strewing herb and burnt to disinfect rooms. In the bed sage is a dense ground cover for sunny positions at about 60 cm spacing — though it needs regular weeding in the first year or two.

Site: Full sun and warmth. The soil must be free-draining, rather lean, calcareous and dry — winter wet kills sage more reliably than frost does, so on heavy ground a layer of gravel or a slightly raised bed helps more than any covering. It comes from the Mediterranean and is only marginally hardy in Central Europe; in harsh positions it needs a covering of brushwood, and variegated cultivars such as Tricolor and Icterina are distinctly more frost-sensitive than the green-leaved species. A subshrub of usually around 80 centimetres; as ground cover allow about 60 centimetres. Care: Pruning is the decisive point: in spring, after growth resumes, cut back into young wood, since old leafless wood barely breaks again. Without this cut the plant becomes senescent from the base within a few years and falls apart. Water little and feed little — lush growth comes at the cost of the essential oil and of the wood ripening, which in turn reduces hardiness. Weed regularly for the first year or two, after which it covers the ground itself. Leaves can be picked all year, the aroma being strongest before flowering. Renew every few years by layering. Rot from the base and mildew in damp, still positions are the only problems.

Sage can be raised from seed: sow from March indoors or from May directly outside, covering only thinly as it needs light, with germination within two to three weeks at around 20 degrees. Seedlings vary in aroma, which usually matters little for the kitchen. Variegated and particularly aromatic cultivars must be propagated vegetatively, as they do not come true: tip cuttings from non-flowering shoots in early summer root reliably in lean substrate within a few weeks. Layering is simplest — low shoots root by themselves if covered with soil and can be severed the following year. Since the plant should be replaced every few years anyway, keeping a supply of layers coming on is worthwhile.

Common sage comes from the Mediterranean and is not native to Central Europe, yet it supplies well-documented forage in the garden: around 30 wild bee species have been recorded at the flowers, two of them sage specialists. Nectar value is high, pollen value low — sage is a nectar plant, not a pollen plant. The deep corolla tube favours long-tongued visitors; violet carpenter bee and buff-tailed bumblebee come regularly, while short-tongued bumblebees bite the tube open from the side and rob the nectar. Five moth species use it as a caterpillar host, among them the silver Y. Left uncut over winter, the woody framework and dry stems also provide shelter for small insects.

Special features: subshrub, woodens from the base + goes over without cutting back; prune in spring into young wood only (old wood barely resprouts); needs full sun + free-draining, calcareous, dry soil; winter wet is more dangerous than frost; winter protection in harsh sites; leaves harvestable year-round, aroma strongest before flowering; variegated cultivars ('Tricolor', 'Icterina') markedly more frost tender;

South-eastern Europe: the Balkan peninsula and the eastern Adriatic. Common sage is native from Slovenia and Croatia through Bosnia, Montenegro and Albania to North Macedonia and Greece, with outposts reaching into Italy. Closely related subspecies cover further parts of the Mediterranean: subsp. lavandulifolia grows in central and eastern Spain, climbing to about 2000 metres there, subsp. gallica from south-western Germany to Italy, and subsp. multiflora in the north-western Balkans. As a culinary and medicinal herb the species has been kept in cottage gardens north of the Alps since the Middle Ages; it escapes there only occasionally and rarely persists, being poorly competitive against the native flora.

In its homeland common sage occupies dry, sun-exposed slopes, rock swards and open xerothermic grassland, mostly over limestone and often where there is very little soil. That is the key to its behaviour in the garden: it is adapted to sites where water drains away fast and competition stays low. Its ecological indicator values place it on dry, bright, neutral to basic, moderately nutrient-poor and subcontinental sites. On moist, nutrient-rich or shaded ground it loses out to the surrounding vegetation, ripens its wood poorly and rots from the base over winter.