GrowingHQ
Herbperennial herbStraightforward

Mint

Mentha

The one herb whose main growing problem is that it grows too well. Mint spreads by underground runners and will colonise a bed within two seasons, which is why the standard advice is to confine it to a pot. It is also one of the few herbs genuinely happy in shade and in damp ground, which makes it useful exactly where the Mediterranean herbs fail.

Position
Partial shade or Full sun or Dappled shade
Water
high demand
Drainage
Moisture-retentive, Tolerates wet ground
Grows to
30–90 cm × 100 cm
Hardiness
H6
Harvest
May to September
Difficulty
Straightforward

Described view

Pale thickened twisted mint shoots coming up in spring beside normal ones, with no rust pustules yet visible

August

Harvest

Mint’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
PlantMarch. April. May. June. July.
HarvestMay. June. July. August. September.
DivideMarch. April. October.
DormantJanuary. February. December.

Names that cause confusion

mintA genus rather than a species, and the mints hybridise readily. Peppermint is Mentha × piperita, a hybrid; spearmint is Mentha spicata. Plants sold simply as 'mint' vary considerably in flavour.

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.

  • Plantfrom 4 weeks before to 12 weeks after your last spring frost
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Mint — planting

    Checked 2026-08-13

    Almost always bought or divided as a plant rather than sown: named mints do not come true from seed.

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.

Moisture-loving perennial herb

Growing regime
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Mint — growing

Checked 2026-08-13

Wants damp ground and tolerates shade, which is the opposite of the Mediterranean set. Most will spread if allowed to, so the question is usually containment rather than establishment.

Treated the same way: chives, fennel, garlic chives, lemon balm, lovage, sorrel. The herb bed, split by regime

Indoors
Indoors spring to autumn
Where the indoor assessment comes from
IndoorsSourced guidancemoderate confidence
  • Royal Horticultural Society: Mint — 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.

Leaves coarsen
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Mint — harvesting

Checked 2026-08-13

Cut the whole plant back hard as it comes into flower and it regrows soft new leaves within a few weeks. Mint is the herb most improved by being cut down, and a plant left to flower and then go woody is the usual reason a second-year clump disappoints.

source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Mint — care

Checked 2026-08-13

What it is worth to pollinators

Recorded only where the evidence is specific to this plant, because “good for bees” attached to everything means nothing attached to anything.

Nectar value
high
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Plants for pollinators

Checked 2026-08-13

In flower
July, August, September

Picking it and feeding bees are not the same plan

Cutting mint back for leaf quality removes the flowers entirely. A clump left uncut in a corner solves it, and mint is vigorous enough that most gardens can spare one.

Conditions it needs

Light
Partial shade, Full sun, Dappled shade
Direct sun
3 hours a day or more
Frost
Very hardy
Hardiness rating
H6 (RHS)
Grows best at
15–25 °C
Soil
Loam, Clay, Peat-free compost, Silt
Soil pH
6–7.5
Drainage
Moisture-retentive, Tolerates wet ground
Water needs
high
Drought
poor tolerance
Waterlogging
good tolerance
Heat
moderate tolerance
Wind and exposure
good tolerance
Where these figures come from
LightSourced guidancehigh confidence

One of the most shade-tolerant culinary herbs.

  • Royal Horticultural Society: Mint — position

Checked 2026-08-13

Direct sunHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

FrostSourced guidancehigh confidence

Dies back to the ground in winter and reappears in spring.

  • Royal Horticultural Society: Mint — 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

SoilHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Soil pHSourced guidancehigh confidence
  • Plant FinderMissouri Botanical Garden: Mentha

Checked 2026-08-13

DrainageHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Water needsHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

DroughtHorticultural consensusmoderate confidence

Unusual among common herbs in genuinely wanting moist ground.

  • Royal Horticultural Society: Mint — watering

Checked 2026-08-13

WaterloggingHorticultural consensusmoderate confidence
  • Plant FinderMissouri Botanical Garden: Mentha

Checked 2026-08-13

HeatHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

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 clayPrefers this soilMint is the herb that contradicts the herb rule. Where rosemary, thyme and sage want sharp drainage and rot without it, mint wants damp ground and thrives on heavy soil — which is also where it is most likely to run and take over, so it is grown in a sunken bucket regardless of soil.
SandyWorks, with one conditionMint will crop on sandy, but one thing has to be dealt with first. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering.Water and mulch will carry it through. On this soil the watering is not optional in a dry spell, which is the difference between a crop and a failure.
Chalky and alkalineWorks, with one conditionMint will crop on chalky and alkaline, but one thing has to be dealt with first. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering.Water and mulch will carry it through. On this soil the watering is not optional in a dry spell, which is the difference between a crop and a failure.
LoamPrefers this soilLoam suits Mint as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. 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 Mint as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. Silt is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
Peaty and acidGrows well hereMint grows perfectly well on peaty and acid without special measures, though it is not the soil it would choose.
Shallow over rockWorks, with one conditionMint will crop on shallow over rock, but one thing has to be dealt with first. It has little drought tolerance and this soil dries out fast — it will check and bolt in the first dry spell without watering.Water and mulch will carry it through. On this soil the watering is not optional in a dry spell, which is the difference between a crop and a failure.
Made ground and urban soilGrows well hereMint grows perfectly well on made ground and urban soil without special measures, though it is not the soil it would choose.

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

Space and spacing

Mature height
30–90 cm
Mature spread
100 cmSourced guidanceDepends on conditions
Rooting depth
30 cm
Spacing
30–45 cm apart
Where these figures come from
Mature heightHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Mature spreadSourced guidanceDepends on conditionshigh confidence

Applies when: Effectively unlimited in open ground: mint spreads by runners and the figure given is only what it reaches in a season or two before continuing.

  • Royal Horticultural Society: Mint — spread

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: Mint — spacing

Checked 2026-08-13

How far apart to plant mintThree mint plants drawn in a row at their recorded spacing of 30–45 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.30–45 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
5–10 litres
Minimum depth
20 cm
Where the container figures come from
Minimum volumeSourced guidancehigh confidence
  • Royal Horticultural Society: Mint in containers

Checked 2026-08-13

Minimum depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

The standard way to grow it. A pot sunk into a border keeps the runners in while letting the plant look like part of the bed.

Value to wildlife

Recorded only where the evidence names a resource and the months it is available. Most plants flower; that on its own is not what this section is about.

Nectar
A significant source
In flower
Jul, Aug, Sep
Where these figures come from
NectarSourced guidancemoderate confidence
  • Royal Horticultural Society: Plants for pollinators

Checked 2026-08-13

What keeping this costs

Cutting mint back for leaf quality removes the flowers entirely. A clump left uncut in a corner solves it, and mint is vigorous enough that most gardens can spare one.

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
ContainerWell suited
source

Sourced guidancehigh confidence

  • Royal Horticultural Society: Mint in containers

Checked 2026-08-13

5 litres or more; Consistent moistureThe recommended way to grow it outdoors, precisely because it confines the runners.
HydroponicsWell suited
source

Sourced guidancemoderate confidence

  • Purdue ExtensionPurdue University: Hydroponic herbs

Checked 2026-08-13

PolytunnelWell suited
source

Sourced guidancemoderate confidence

  • Agriculture and Horticulture Development BoardAHDB: Herbs under protection

Checked 2026-08-13

AquaponicsWell suited
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Mint — cultivation

Checked 2026-08-13

GreenhouseWell suited
source

Sourced guidancemoderate confidence

  • Agriculture and Horticulture Development BoardAHDB: Herbs under protection

Checked 2026-08-13

Open groundWorkable
Sourced guidanceDepends on conditionshigh confidence

Applies when: It grows extremely well and that is the problem: unconfined mint takes over a bed and is very difficult to remove afterwards, because every fragment of runner regrows.

  • Royal Horticultural Society: Mint — invasiveness

Checked 2026-08-13

A sunken container or a physical barrier
Raised bedWorkable
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Confinement — a sunken pot rather than free planting
WindowsillWorkable
source

Horticultural consensusmoderate confidence

  • Royal Horticultural Society: Herbs indoors

Checked 2026-08-13

Consistent moisture; A cool sill rather than a hot one
Vertical growingWorkable
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Confinement is built in, which suits it.
Traditional dug bedMarginal
source

Horticultural consensusmoderate confidence

Only with a barrier; otherwise it becomes a weed.

No external citation — see the evidence type above.

Checked 2026-08-13

Growing it

  • PlantingPlant in a container, or sink a bottomless pot into the bed. Mint spreads by runners just below the surface and will travel a metre a season through a border.
  • PropagationDivide an established clump in spring or autumn, or root a cutting in water. Mint is among the easiest plants to propagate — a length of runner with a node will take.
  • PruningCut the whole plant back hard after flowering to produce a fresh flush of young leaves, and cut back to the ground in autumn.
  • WateringMint is one of the few herbs that genuinely wants moisture and it is the reason it is grown in a pot standing in a saucer while everything else is not. Keep it damp; a mint that dries out goes woody, mildews and loses its flavour, and cutting it hard back and watering is the way to recover it.
  • FeedingA plant in the ground needs nothing. In a pot, which is where most mint lives, a liquid feed through the growing season keeps the leaves large, and repotting into fresh compost each spring does more than any feed — a season-old pot is a solid mat of rhizome with no compost left in it.
  • HarvestingPick shoot tips rather than individual leaves and pick often — mint responds to cutting by branching, and a plant picked hard stays leafy while one left alone runs up to flower and turns woody at the base. Take the top third of a stem, cutting just above a leaf pair. Cut a whole potful back to a few centimetres in midsummer and it will produce a fresh flush of young leaves within a fortnight, which are better than anything on the old growth.
Where this guidance comes from
PlantingSourced guidancehigh confidence
  • Royal Horticultural Society: Mint — containing

Checked 2026-08-13

PropagationSourced guidancehigh confidence
  • Royal Horticultural Society: Mint — propagation

Checked 2026-08-13

PruningHorticultural consensusmoderate confidence
  • Royal Horticultural Society: Mint — pruning

Checked 2026-08-13

WateringSourced guidancehigh confidence
  • Royal Horticultural Society: Mint — cultivation

Checked 2026-08-13

FeedingSourced guidancemoderate confidence
  • Royal Horticultural Society: Mint — cultivation

Checked 2026-08-13

HarvestingSourced guidancehigh confidence
  • Royal Horticultural Society: Mint — harvesting

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
GreenhouseNo real benefit
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 synthesisGrowingHQ

Checked 2026-08-13

Nothing. Mint grows anywhere with moisture and runs at the root, and putting it in a border under cover is how a greenhouse bed acquires a permanent mint problem.A pot, always — never a greenhouse border
PolytunnelNo real benefit
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 synthesisGrowingHQ

Checked 2026-08-13

Nothing, and the same warning about a tunnel bed with more soil to run through.

On a windowsill

Spring to autumn
source

GrowingHQ editorial positionmoderate confidence

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

  • GrowingHQ editorial synthesisGrowingHQ

Checked 2026-08-13

Productive from roughly March to October and not after. Growth stops when the light does, and a plant pushed through the dark months usually does not recover. Dormancy and light. Mint dies back completely in winter and a pot kept warm makes pale weak shoots that are worse than none; it is one of the best sill herbs from March to October.

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.

Well suited

An established soilless crop. Grown this way commercially or routinely by home growers, with predictable results.

source

Sourced guidancemoderate confidence

  • Purdue ExtensionPurdue University: Hydroponic herbs

Checked 2026-08-13

Roots readily in plain water and grows enthusiastically. The problem is confinement rather than cultivation.

Techniques that suit it

  • Deep water cultureRoots hang in aerated solution. Very productive and very unforgiving of solution temperature — warm solution holds less oxygen and root disease follows.
  • Nutrient film (NFT)A shallow stream of solution runs over bare roots in a sloped channel. Cheap and productive for small fast crops; a pump failure kills a crop within hours because there is no reservoir at the roots.
  • Ebb and flowA bed of inert medium floods and drains on a timer. The medium holds moisture between floods, which makes it far more tolerant of interruption than NFT.
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Root space
Vigorous and spreading. In a shared system mint will colonise neighbouring channels exactly as it colonises a border, so it is best given its own.
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 ExtensionPurdue University: Hydroponic solution management — pH

Checked 2026-08-13

What actually goes wrong

  • Taking over. The trait that makes mint a container plant outdoors makes it a nuisance in a shared reservoir, where roots travel between channels.
    source

    GrowingHQ editorial positionmoderate confidence

    An operational judgement about running a mixed system rather than a claim about the plant.

    • GrowingHQ editorial synthesisGrowingHQ

    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 young shoots and leaves from late spring; flavour is at its best before flowering.
  • How to pick itCut whole stems rather than stripping leaves, which encourages branching.
  • Keeping itDries reasonably well, freezes better. Fresh stems keep several days in water.
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

Keep picking

Regular picking keeps this plant producing. Fruit or leaves left to mature signal it to slow down or stop.

What goes wrong

ProblemHow oftenNotes
Mint leaf beetlecommon
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

A metallic green beetle that sits out in daylight, unlike everything else that holes mint.
Powdery mildewoccasional
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

In dry conditions and crowded pots.
Aphidsoccasional
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Slugs and snailsoccasional
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

On new spring growth.

What to look for

Views that settle something a description cannot. Where the photograph has not been taken yet, the description of what it will show is here instead — which is the useful half of it either way.

Described view

A mint plant lifted from a pot showing the dense mat of pale underground runners that make it spread

  • The runners are the reason mint is grown in a container.

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.

  • Alternative toOregano
    Both are Lamiaceae used as culinary herbs, but they suit opposite conditions: mint for damp shade, oregano for dry sun. A grower whose herb bed has both situations should split them rather than treating either as a general-purpose herb.
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Herb growing

    Checked 2026-08-13

Safety and edibility

  • Legal requirementGarden mint is not a listed invasive species in the UK and may be grown freely, but statutory guidance is clear that garden plants must not be allowed to spread into the wild. Mint runners travel into neighbouring ground, and material tipped with garden waste establishes readily where it was not wanted.
    source

    Legal or label requirementmoderate confidence

    • GOV.UK guidanceUK Government: Prevent the spread of harmful invasive and non-native plants

    Checked 2026-08-13

    Do not tip mint runners onto open ground or into hedgerows; compost them in a closed heap or dispose of them with garden waste collection.

Sources for this page

Agriculture and Horticulture Development Board · GOV.UK guidance · Plant Finder · Purdue Extension · 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.