Sage

Origin & history

Culinary sage comes from the dry limestone slopes of the northern Mediterranean, above all the Dalmatian coast and the Balkans — a large share of the dried sage in trade still comes from there, mostly from Albania. It was cultivated north of the Alps early on: Charlemagne’s estate ordinance of around 800 lists salvia among the plants every crown estate was to grow. Botanically it belongs to the largest genus of the mint family, with around a thousand species; its flowers have the characteristic lever mechanism that tips pollen onto the back of a visiting bumblebee.

Varieties

For the kitchen, Salvia officinalis is the species you want; the large-leaved selection “Berggarten” stays compact, barely flowers and is considered particularly robust through winter. The coloured forms with red, gold-edged or white-variegated foliage are pretty but milder in flavour and more sensitive to wet winters. Do not confuse it with clary sage (Salvia sclarea), a biennial ornamental, or pineapple sage (Salvia elegans), which is not hardy here.

Care

Sage gets no feeding and is watered only while establishing and in long dry spells; nitrogen produces soft foliage that comes through winter badly. If you want plenty of leaf, cut out the flower stems as soon as they appear — the plant then puts its energy into foliage rather than seed. Leave the secateurs alone in late summer and autumn: late cuts push soft shoots that the first frost takes. The easiest way to replace an old bush that has fallen open is a layer — weigh a low shoot down with soil and it will root within a season.

What can go wrong

Winter losses almost always come down to wet rather than cold: in heavy soil the roots rot, so plant high, work in sand or grit, and keep bark mulch away from the base of the stem. In muggy summers mildew coats the leaves in white, especially on dense, unpruned bushes — thin the plant out, space them further apart and water at the base in the morning. Pale speckling on the upper leaf surface usually comes from leafhoppers and is purely cosmetic; the leaves stay usable.

Harvest, storage & kitchen

Sage needs a firm hand with the dose: two or three leaves season a whole pan, and the longer it cooks the more penetrating it gets. Classic uses are tossed in butter with gnocchi and ravioli, fried whole as a crisp, and with rich meat as in saltimbocca. In mild winters the subshrub keeps its leaves, so you can pick fresh ones even in January — usually better than dried. If you do dry it, do so quickly, airy and dark, or it takes on a musty note.

Frequently asked questions

When can I first harvest sage?

In the planting year take single leaves only from May, so the young shrub can settle in. From the second year you can pick right through from May to the end of October, taking no more than a third of the bush at once. Young pale leaves taste finer than old leathery ones.

Can sage be harvested while it is in flower?

Yes, the leaves stay usable, though during the May and June flowering they taste sharper and more resinous. The blue-violet flowers are edible and good for bees, and softer, milder growth follows once flowering is over.

Is sage winter hardy?

Yes, the subshrub stays out in the bed and needs no covering there. A container is trickier: the rootball freezes through, and on sunny frosty days the leaves lose water the roots cannot replace. So move the pot against the house wall and water a little on frost-free days.

How big does a pot for sage need to be?

At least ten litres and around 30 centimetres across, because sage grows into a proper little shrub; in a bed allow 35 to 40 centimetres. Free-draining compost with added sand and a drainage hole are essential.

When do you cut sage back?

In spring, as soon as new growth shows, and only into young leafy wood. Sage is reluctant to shoot again from bare old wood, so the woody base stays. Autumn would be the wrong moment, as the new shoots would no longer ripen before frost.