GrowingHQ
Herbperennial herbStraightforward

Sage

Salvia officinalis

An evergreen sub-shrub with the same requirements as rosemary and thyme — sun, sharp drainage, little water — and the same failure mode in wet ground. It is picked year-round, and its main maintenance need is replacement: sage becomes woody and sparse after four or five years and is easily renewed from cuttings.

Position
Full sun
Water
low demand
Drainage
Free-draining
Grows to
45–80 cm × 60–90 cm
Hardiness
H5
Harvest
January to December
Difficulty
Straightforward

Described view

A mature sage plant with soft grey-green textured oval leaves on woody lower stems

August

Plant · Harvest · Prune

Sage’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

ActivityJFMAMJJASOND
PlantApril. May. June. July. August.
In flowerMay. June. July.
HarvestJanuary. February. March. April. May. June. July. August. September. October. November. December.
PruneApril. May. August.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

  • Plant0–14 weeks after your last spring frost
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Sage — planting

    Checked 2026-08-13

What kind of herb this is

Herbs are a kitchen grouping rather than a botanical one, and the plants in it want opposite things. This is the one distinction that decides how to treat it.

Mediterranean woody herb

Growing regime
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Sage — growing

Checked 2026-08-13

Wants sun, poor free-draining ground and very little water once established. Far more of these die from winter wet at the roots than from cold air, so drainage matters more than hardiness ratings suggest.

Treated the same way: bay, borage, chamomile, hyssop, lemon thyme, marjoram and 7 more in the same group. The herb bed, split by regime

Why winter wet kills a Mediterranean herbTwo soil cross-sections side by side. On the left, a well-drained planting: the crown of a rosemary sits slightly proud of the surrounding soil on a low mound, the root zone is open gritty soil with air between the particles, and arrows show winter rain moving down and away past the roots. The plant above is dense and well furnished. On the right, the same herb in heavy soil in a hollow: the crown sits level with or below the surface, the root zone is dense soil over a compacted pan, and winter rain has nowhere to go so a water table stands in the root zone from November to March. The roots there are drawn broken and dashed to show they have died, and the plant above is sparse and thin. The point is that the plant looks unharmed all winter because an evergreen with a full canopy asks almost nothing of its roots in January, so the loss only shows the following spring when it fails to grow.Sharp drainagecrown proud, water moves throughroots stay firm and paleair between the particles all winterWinter wetcrown in a hollow, water standswater table, Nov–Marcompacted pan — nowhere to goroots dark, soft and sourand the plant above still looks fineopen gritty soilheavy soilstanding waterliving rootsPlanting on a low mound, adding grit, or standing a pot on feet all do the same job: get the crown above the water.
The damage happens in January and shows in May. An evergreen herb asks almost nothing of its roots in winter, so a drowned root system stays invisible until the plant is asked to grow and cannot.
Indoors
Not worth growing indoors
Where the indoor assessment comes from
IndoorsSourced guidancemoderate confidence
  • Royal Horticultural Society: Sage — growing indoors

Checked 2026-08-13

Almost any herb will sit on a windowsill in July. This is about whether it is still there in March, which is the part a pot on a supermarket shelf does not tell you.

What happens when it flowers

On a herb this is rarely a problem and rarely nothing. It is the point at which the plant stops being what you grew it for — by a lot, a little, or not at all.

No real effect on the leaves
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Sage — harvesting

Checked 2026-08-13

Nothing to do about it. Flowering does not change what sage is worth picking, so there is no reason to prevent it.

Conditions it needs

Light
Full sun
Direct sun
6 hours a day or more
Frost
HardySourced guidanceDepends on conditions
Hardiness rating
H5 (RHS)
Grows best at
15–28 °C
Soil
Sandy, Chalky, Loam
Soil pH
6–8
Drainage
Free-draining
Water needs
low
Drought
good tolerance
Waterlogging
poor tolerance
Heat
good tolerance
Wind and exposure
moderate tolerance
Where these figures come from
LightSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — position

Checked 2026-08-13

Direct sunHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

FrostSourced guidanceDepends on conditionshigh confidence

Applies when: Hardy in free-draining soil; losses in winter are usually about wet rather than cold.

  • Royal Horticultural Society: Sage — hardiness

Checked 2026-08-13

Hardiness ratingSourced guidancehigh confidence
  • Royal Horticultural Society: RHS hardiness ratings

Checked 2026-08-13

Grows best atHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

SoilSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — soil

Checked 2026-08-13

Soil pHSourced guidancehigh confidence
  • Plant Finder — Missouri Botanical Garden: Salvia officinalis

Checked 2026-08-13

DrainageSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — soil

Checked 2026-08-13

Water needsSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — watering

Checked 2026-08-13

DroughtSourced guidancehigh confidence
  • Royal Horticultural Society: Drought-tolerant plants

Checked 2026-08-13

WaterloggingSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — soil

Checked 2026-08-13

HeatSourced guidancehigh confidence
  • Plant Finder — Missouri Botanical Garden: Salvia officinalis

Checked 2026-08-13

Wind and exposureHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

SoilVerdictWhy
Heavy clayWorks, with one conditionSage will crop on heavy clay, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
SandyPrefers this soilSandy suits Sage as it stands: The pH suits it: it wants 6 to 8, and this soil is in that range. The free drainage is exactly what it wants. Sandy soil is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Chalky and alkalinePrefers this soilChalky and alkaline suits Sage as it stands: The free drainage is exactly what it wants. Chalky soil is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
LoamPrefers this soilLoam suits Sage as it stands: The pH suits it: it wants 6 to 8, and this soil is in that range. The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
SiltyPrefers this soilSilty suits Sage as it stands: The pH suits it: it wants 6 to 8, and this soil is in that range. The free drainage is exactly what it wants. The soil holds moisture, which saves a great deal of watering.
Peaty and acidWorks, with one conditionSage will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Shallow over rockPrefers this soilShallow over rock suits Sage as it stands: The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Made ground and urban soilWorks, with one conditionSage will crop on made ground and urban soil, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height
45–80 cm
Mature spread
60–90 cm
Rooting depth
45 cm
Spacing
60 cm apart
Where these figures come from
Mature heightHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Mature spreadHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Rooting depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

SpacingSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — spacing

Checked 2026-08-13

How far apart to plant sageThree sage plants drawn in a row at their recorded spacing of 60 cm between plants. The spacing is drawn to scale against a one metre rule; the plants themselves are symbols rather than scale drawings, so the distance between them is the part to read.60 cmone metre
Measured centre to centre. Plants set closer than this compete for light and water long before they look crowded, and the crowding cannot be undone once they are in.

In a container

Minimum volume
10–15 litres
Minimum depth
25 cm
Where the container figures come from
Minimum volumeSourced guidancehigh confidence
  • Royal Horticultural Society: Herbs in containers

Checked 2026-08-13

Minimum depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Better in a pot than in heavy ground, and worth using loam-based compost with extra grit rather than a multipurpose, which stays too wet in winter. Raise the pot on feet so it drains freely, and expect to replace the plant every four or five years as it goes woody.

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

MethodSuitabilityWhat it needs
Open groundWell suited
Sourced guidanceDepends on conditionshigh confidence

Applies when: On free-draining soil in full sun; short-lived on heavy wet ground.

  • Royal Horticultural Society: Sage

Checked 2026-08-13

Sharp drainage; Full sun
Raised bedWell suited
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Mediterranean herbs

Checked 2026-08-13

ContainerWell suited
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Herbs in containers

Checked 2026-08-13

Gritty compost; 10 litres or more
Traditional dug bedWorkable
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Grit worked in
GreenhouseWorkable
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

For overwintering container plants in cold districts.
HydroponicsWorkable
source

GrowingHQ editorial positionmoderate confidence

As rosemary — woody, sprawling and happier dry. It grows perfectly well and is not what a system is for.

  • GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

PolytunnelWorkable
source

Sourced guidancemoderate confidence

  • Agriculture and Horticulture Development Board — AHDB: Protected cropping

Checked 2026-08-13

WindowsillMarginal
source

Horticultural consensusmoderate confidence

Too large for most sills, and it grows soft indoors. Better outdoors, where it is hardy.

No external citation — see the evidence type above.

Checked 2026-08-13

Growing it

  • PruningTrim after flowering, cutting only into growth that carries leaves. Sage, like rosemary, does not reliably reshoot from bare old wood.
  • PropagationTake semi-ripe cuttings in summer and replace plants every four or five years. Old sage becomes woody, sparse and much less productive.
  • WateringWater a new plant through its first summer while it roots out, and after that leave it alone — an established sage in reasonable soil is genuinely drought-tolerant and its grey felted leaves are the giveaway. In a pot, water thoroughly and let the compost dry appreciably between soakings. Sage kept damp turns yellow low down, sheds leaves and rots at the collar, which is the commonest way a good plant is lost.
  • FeedingSage does not want feeding and rarely benefits from it. The plant's real limit is age rather than nutrition: it goes woody, sparse and bare-legged after about four years whatever it is given, and the answer is a new plant from cuttings rather than fertiliser. A container sage will take a light top-dressing of fresh compost in spring and nothing more.
  • HarvestingPick leaves in any month — sage is evergreen and useful in January — but take the bulk of what you want between late spring and late summer, when growth is fast enough to replace it. Pick individual leaves or short sprigs from the outside of the bush, and avoid stripping one side bare, because sage regrows unevenly and a lopsided plant stays lopsided.
  • PlantingPlant in spring into full sun and the sharpest drainage available, setting the crown slightly proud of the surrounding soil so water runs away from the stem base. On clay, plant on a low mound with grit worked in, or grow it in a pot instead — sage in cold wet ground is a short-lived plant however well it is otherwise treated.
Where this guidance comes from
PruningSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — pruning

Checked 2026-08-13

PropagationSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — propagation

Checked 2026-08-13

WateringSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — cultivation

Checked 2026-08-13

FeedingSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — cultivation

Checked 2026-08-13

HarvestingSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — harvesting

Checked 2026-08-13

PlantingSourced guidancehigh confidence
  • Royal Horticultural Society: Sage — planting

Checked 2026-08-13

Where to make a pruning cutFour stems compared. The first is cut cleanly on a slope about five millimetres above an outward-facing bud, sloping away from it, and is labelled correct. The second is cut too far above the bud, leaving a long stub that dies back. The third is cut too close, into the bud itself, which loses the shoot. The fourth is cut sloping towards the bud so rain runs onto it rather than away, which rots it. In every case the bud points outwards, away from the centre of the plant.Correct5 mm, sloping awayToo highstub dies backToo closebud lostSloping inrain sits on the bud
The bud you cut to becomes the new shoot, and it grows in the direction it points — which is why an outward-facing bud opens the plant up and an inward-facing one crosses the middle.
Four ways to make more plantsFour propagation operations compared, each showing where the separation is made and what must be present on both sides of it. Division: a clump cut between crowns, with roots and at least one growing point on every piece. Stem cutting: a shoot cut just below a leaf node, because the node is where roots form, with the lower leaves removed. Runner: a plantlet already rooting where it touches the ground, severed from the parent only after its own roots have taken. Offset: a young shoot at the base of the parent, separated with its own roots attached. In each case the cut is marked and the part that must be retained is labelled.Divisioncut between crownsroots on every piececut below a nodeStem cuttingroots form at the nodestrip the lower leavesRunnerlet it root firstthen sever the linkOffseta shoot at the basetake its roots with it
The rule is the same in all four: the new piece needs both a growing point and roots of its own. A cutting is the exception that has to make its roots afterwards, which is why the node matters so much.

Is it worth putting under cover?

Whether it will grow there is on the methods table above. This is whether the space is well spent, which is a different question and usually the one being asked.

StructureWhat protection is worthWhat decides it
GreenhouseWorse under cover
source

GrowingHQ editorial positionmoderate confidence

What protection is worth for this crop, judged against the same standard as every other record in this file.

  • GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

Winter humidity, and size — a mature sage is a sprawling sub-shrub that wants a dry sunny bank.
PolytunnelWorse under cover
source

GrowingHQ editorial positionmoderate confidence

What protection is worth for this crop, judged against the same standard as every other record in this file.

  • GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

Winter humidity.

On a windowsill

Does not work indoors
source

GrowingHQ editorial positionmoderate confidence

How long the crop is actually productive on an ordinary British windowsill without added light.

  • GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

 Not a windowsill crop. The reason is given — usually light, root volume or sheer size. Size and airflow. Sage is a sprawling sub-shrub that wants a dry sunny bank; indoors it goes soft, mildews and rots at the base.

Growing it without soil

Nearly anything can be grown in a soilless system by somebody with enough equipment. The useful question is whether it is worth it, in which technique, and what goes wrong.

Works with conditions

Succeeds when the conditions listed here are met and fails when they are not. The conditions are the answer, not a caveat.

source

GrowingHQ editorial positionmoderate confidence

As rosemary — woody, sprawling and happier dry. It grows perfectly well and is not what a system is for.

  • GrowingHQ editorial synthesis — GrowingHQ

Checked 2026-08-13

Techniques that suit it

  • Drip-fed mediumSolution is dripped into an inert medium around each plant. The most forgiving technique and the one that suits large, long-season, heavy crops.
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Root space
Moderate and free-draining.
Lighting
Needs supplementary light
pH band
5.5–6.5
Where these figures come from
Root spaceHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

LightingHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

pH bandSourced guidancehigh confidence

Outside roughly this band, individual nutrients become unavailable even when they are present in the solution — which is why a crop can starve in a full reservoir.

  • Purdue Extension — Purdue University: Hydroponic solution management — pH

Checked 2026-08-13

What actually goes wrong

  • Warm solution. Above roughly 22 °C the water holds much less dissolved oxygen and root disease follows quickly, which is why summer is harder than winter in an indoor system.
    source

    Sourced guidancemoderate confidence

    • Purdue Extension — Purdue University: Solution temperature and dissolved oxygen

    Checked 2026-08-13

No nutrient recipes here

GrowingHQ records pH bands, which are measurable properties of nutrient availability, and deliberately records no EC or PPM targets and no mixing instructions. Published targets vary by cultivar, growth stage, water source and technique, and the figures that apply to your system are on the product you bought.

Harvesting

  • When it is readyPick leaves at any time of year; flavour is strongest before flowering.
  • How to pick itPick individual leaves or short sprigs from the tips.
  • Keeping itDries well and retains its flavour.
Where the harvest guidance comes from
When it is readyHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

How to pick itHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Keeping itHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

What goes wrong

ProblemHow oftenNotes
Rosemary beetlecommon
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Shake the bush over paper in autumn — the beetles drop rather than fly.

Grown with, grown after, grown instead

Every relationship states its mechanism. A pairing nobody can explain is a pairing nobody has checked, and it does not go in.

  • Closely relatedRosemary
    Both are Salvia species with the same requirement for sharp drainage and full sun, and the same intolerance of hard pruning into old wood. Care guidance is effectively shared.
    source

    Sourced guidancehigh confidence

    • Plants of the World Online — Royal Botanic Gardens, Kew: Salvia

    Checked 2026-08-13

Sources for this page

Agriculture and Horticulture Development Board · GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-13.

If something is wrong with it

Something else? Work through it with the diagnostic tool.