Rosemary
ThrivesWoody Mediterranean evergreen. Loves the brightest, driest sill — let it dry between waterings and it crops all year.
Grow more · Worry less
Best Indoor Herbs to Grow on a Windowsill UK
We grow edibles indoors for a living. Tell the finder which way your window faces — it does the rest.
Direct answer: the best indoor herbs for a UK windowsill are basil, parsley, chives, mint, coriander, thyme, rosemary, sage and oregano. Match them to your light: sun-lovers like basil and rosemary want a bright south or west sill (6+ hours), while mint, parsley and chives cope with shadier east or north windows.
9herbs ranked
4window aspects
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Windowsill herb finder
Pick your window — see what will thrive on the sill.
Light on this sill
≈7h
Showing 9 herbs for a south-facing window in summer (≈7h of light/day): 9 thrive, 0 cope with care, 0 need a grow light.
Thyme
ThrivesCompact and forgiving. Thrives in full sun and poor, free-draining compost; perfect for a sunny south or west ledge.
Oregano
ThrivesSun-hungry and vigorous. Pinch tips often to keep it bushy. Listed as toxic to cats and dogs — site it out of reach.
Sage
ThrivesGrey-leaved and drought-tolerant. Wants strong light and good airflow to keep mildew off the leaves.
Basil
ThrivesTender and not UK-hardy: grow indoors year-round. Wants warmth (18°C+) and the sunniest spot you have.
Coriander
ThrivesBolts in heat and long days. A cooler east sill or short winter days keep it leafy for far longer.
Chives
ThrivesTough, quick and shade-tolerant. An allium, so toxic to cats and dogs — keep the pot well away from pets.
Parsley
ThrivesDeep taproot, so give it a tall pot. Tolerates part shade. Treat as caution around pets and grazing dogs.
Mint
ThrivesThe shade champion — happy on a dim north sill. Vigorous roots, so keep it in its own pot. Best kept from pets.
Light-hour bands are indicative — they vary by source, latitude and glazing. Pet-safety follows common UK guidance; check the RHS and your vet for any plant near curious cats or dogs.
What herbs grow well on a windowsill indoors?
Basil, parsley, chives, mint, coriander, thyme, rosemary, sage and oregano all grow well on an indoor windowsill in the UK. The deciding factor is light, not luck. Sun-loving Mediterranean herbs need a bright sill; soft, leafy herbs tolerate shade. Get the match right and every one of them crops for months.
The split is simple. Sun-lovers — basil, rosemary, thyme, sage and oregano — want 6+ hours of direct light, so a south or west sill suits them. Shade-tolerant herbs — mint, parsley, chives and coriander — manage on 3–4 hours, which is what an east or north window gives. Our windowsill herb finder above sorts all nine for your exact aspect in one tap. For the science of growing edibles under cover, university extensions like Purdue University Extension's guide to growing plants indoors under lights are a reliable, jargon-free reference.
Best herbs by UK window aspect
Your window aspect sets the light, and the light sets the herb. This table is the quick decision guide; the finder turns it into a ranked, per-herb result. Hours are a clear-day summer estimate — halve them for a UK midwinter.
| Window aspect | Summer light | Best herbs | Watch out for |
|---|---|---|---|
| South | 6–8h direct | Basil, rosemary, thyme, sage, oregano | Midsummer scorch & bolting |
| West | 4–5h afternoon | Basil, thyme, parsley, chives | Hot, dry afternoons — water more |
| East | 3–4h morning | Coriander, parsley, mint, chives | Cooler; ideal for bolt-prone herbs |
| North | 0–1h direct | Mint, parsley, chives | Too dim for most — add a grow light |
Aspect assumes the Northern Hemisphere. Net curtains, deep reveals and neighbouring buildings all cut these figures — when in doubt, treat your sill as one aspect dimmer.
How to use the windowsill herb finder
The finder answers one question — "what will actually grow on my sill?" — in three taps. It reads an indicative light estimate for your aspect and season, then ranks every herb as Thrives, OK with care, or Add a grow light.
1
Pick the aspectSouth, west, east or north — whichever way your window faces.2
Set the seasonSummer or winter, so light hours match the time of year.3
Read the resultFlip on “pet-safe only” if needed, then plant the green-badged herbs first.How it works: light, season and bolting
Indoor herbs live or die by light. A bright UK summer sill delivers roughly 6–8 hours of usable light on a south aspect; by midwinter that can fall below 4 hours even on the sunniest ledge. The finder halves its summer estimate for winter to reflect that drop, which is why herbs slide from "Thrives" toward "Add a grow light" as the season changes.
Heat and daylength matter too. Coriander bolts — runs to seed and stops cropping — once daylength tops 12 hours or temperatures pass 25°C, so the short days of a UK autumn and winter actually keep it leafy for longer, as Horticulture Magazine's coriander guide explains. Humidity is the quieter factor: UK homes typically sit at 40–50% relative humidity, while many tender herbs prefer more, so grouping pots together or standing them on a damp gravel tray helps. For fast, near-instant windowsill greens while your herbs establish, Penn State Extension's microgreens guide is worth a look.
Can you grow herbs indoors on a windowsill all year?
Yes — with a light top-up in winter. From spring to autumn a bright UK sill grows herbs unaided. Tender basil isn't hardy here, so it lives indoors year-round anyway. The bottleneck is November to February, when low light leaves sun-lovers leggy. A small LED grow light bridges the gap and keeps you cropping.
This is exactly where most "top 10 herbs" articles stop and where we carry on. If your sill keeps pushing herbs into the "Add a grow light" band, that's your cue to add supplementary lighting rather than fight the season. Our grow-lights pillar guide covers LED spectrum, run hours and PPFD for low-light UK flats, and the running-cost calculator shows a small herb light costs only a few pounds a month to run.
Windowsill to grow light: the upgrade path
There's a clean progression from a passive sill to a controlled setup, and you only move up a rung when the plants ask for it:
- Bright sill (south/west): no kit needed in summer. Rotate pots a quarter-turn every few days so they grow evenly toward the glass.
- Dim sill (east/north) or winter: add a compact LED grow light on a timer, 12–16 hours a day, 20–30cm above the canopy. This is the single biggest upgrade for indoor herbs.
- No good sill at all: a small hydroponic or self-watering planter under a grow light removes light and watering guesswork entirely — the route we take on our own shelves.
Seed houses like Mr Fothergill's windowsill herb garden guide are a good source for UK-appropriate varieties to start with at each stage.
Pet-safe herbs for UK homes with cats and dogs
If a curious cat or dog shares your kitchen, lead with the pet-safe filter. Based on common toxicity guidance, basil, rosemary, thyme, sage and coriander are generally considered safe around cats and dogs. Chives (and all alliums), oregano, and large amounts of mint are best kept out of reach; treat parsley with caution around grazing pets.
Toggle Pet-safe only in the finder to hide everything but the safe options for your sill. It's a layer of practical care most ranking pages skip — and exactly the kind of detail that keeps a plant, and a pet, healthy. As always, guidance evolves: if a pet nibbles a houseplant, check current advice and speak to your vet.
People also ask
Can you grow herbs indoors on a windowsill?
Yes. Most culinary herbs grow well on a windowsill when the light matches the plant. Basil, thyme, rosemary, sage and oregano want a bright south or west sill with 6+ hours of light, while mint, parsley, chives and coriander cope with shadier east and north windows. Add a grow light in winter when daylight drops.
What can I plant indoors in October?
In October, sow coriander, parsley, chives and winter-hardy herbs on a bright UK windowsill, and keep basil going indoors. Short autumn days actually suit coriander, because it bolts when daylength tops 12 hours — so cooler, shorter days keep it leafy for longer. Supplement weak light with an LED grow light.
What plants grow well on window sills?
Compact, quick-cropping edibles grow best on window sills: culinary herbs (basil, parsley, chives, mint, coriander, thyme), salad leaves and microgreens. They have shallow roots, tolerate small pots and crop within weeks. Match sun-lovers to south and west sills and shade-tolerant herbs to east and north windows.
How deep does a pot need to be for windowsill herbs?
Cut-and-come-again salad leaves cope with about 15cm of compost. Most leafy herbs prefer 18–20cm pots, and taprooted parsley and coriander, plus woody rosemary, do best with 20–25cm of depth. Deeper pots hold moisture longer, which reduces drying out and bolting.
Do indoor herbs need a grow light in a UK winter?
Often, yes. From November to February even a south-facing UK sill may give under 4 hours of weak light — below what sun-lovers like basil and rosemary need. A small LED grow light run 12–16 hours a day keeps growth steady, prevents leggy stems and lets you crop herbs right through winter. See our grow-lights guide.
Outgrowing the windowsill?
When the sill runs short on light, add the right one
The herbs your finder flags as “Add a grow light” aren't failures — they're just under-lit. We build indoor farms for a living, and a small efficient LED is the cheapest way to crop herbs all winter. Honest reviews, real wattages.