How to grow lavender indoors

Lavender is a Mediterranean shrub adapted to poor, chalky soil, hard sun and dry air.^[4] An indoor windowsill offers rich compost, filtered light and centrally heated humidity, which is close to the opposite on every count. That mismatch is why indoor lavender so often limps along for a few months and then dies from the roots up.

It is still worth doing. You need the right variety, a bright enough window, and a soil mix that drains harder than anything else you grow.

Can lavender grow indoors?

Yes, provided you can give it six or more hours of direct sun and a sharply draining mix that leans alkaline. Below four to five hours of direct sun it survives without thriving, gets leggy, and will not flower.^[3] A grow light closes that gap; Iowa State’s indoor-herb numbers are a south window or a full-spectrum lamp on a 12 to 16 hour timer.^[1]

Set expectations honestly, because no extension will promise you indoor bloom. With a true south exposure or a proper light, a dwarf English lavender can flower in season. Short of that, what you get is a silver-leaved, drought-proof plant whose foliage still smells like lavender when you brush it, which is not nothing, but it is not a photo of Provence either.^[5]

Choosing a variety

Variety choice does more for your chances than anything else on this page.

Dwarf English lavenders

Compact cultivars of Lavandula angustifolia are the ones to grow indoors. They stay small, tolerate container life, and carry the sweet, low-camphor scent people associate with lavender. Two are widely available and both are reliable: ‘Munstead’ at 12 to 18 inches, the earlier to flower, and ‘Hidcote’ at 12 to 16 inches, deeper purple and slightly stronger scented.^[2] Either works on a windowsill, and both are hardy to zone 5 outdoors if the pot ever graduates to the garden.^[2]

Full-size and other species

Full-size English lavender reaches three feet across and wants root room a pot cannot give it. It can be kept indoors for a season, and it will decline.

French and Spanish lavender (L. dentata, L. stoechas) are far less cold-hardy, zone 8 against English lavender’s zone 5,^[6] and handle humid air better, which makes them the standard recommendation in the humid South and a reasonable pick for a damp house. They need every bit as much light. Lavandin (L. × intermedia), the commercial oil hybrid, runs two to three feet and belongs outdoors, though its cultivar ‘Provence’ is the named pick where humidity is the enemy.^[6]

Starting your plant: transplants, cuttings or seed

There are three ways in, and they differ enormously in how long they take.

A nursery transplant is the fastest and the right choice for a first attempt. You get an established root system, you skip the fragile early weeks, and a spring-bought plant may flower the same year.

A cutting from a plant you already have costs nothing and roots in three to six weeks.^[7] It also produces an exact clone, which matters because named cultivars do not come true from seed.^[8]

Seed is the slow route: germination starts in two to three weeks at around 70°F, runs uneven after that, and plants take a year or more to reach flowering size.^[7] Seed catalogs often suggest chilling the packet in the fridge first; extension guidance does not require it, and the levers that demonstrably matter are warmth, a heat mat helps, light cover, and patience. Seed sold as ‘Munstead’ or ‘Hidcote’ produces plants that vary noticeably from the parent.^[8]

Start with a transplant unless you have a reason not to.

Growing from a transplant

You need a healthy plant, a pot with drainage, and a free-draining mix.

Buy in spring if you can, and choose a plant with grey-green foliage right down to the base rather than one that is bare and woody at the bottom. Check the underside of the leaves for webbing or sticky residue before you take it home.

Pick an unglazed terracotta pot a size up from the root ball, no more. Terracotta is porous, so water evaporates through the walls as well as the surface, and for a plant this prone to root rot that is a real advantage over plastic or glazed ceramic.^[1] This 6-inch terracotta pot is the one we use. Make sure it has a drainage hole, and step up pot sizes gradually as the plant grows rather than parking a small plant in a big reservoir of wet soil.

Fill it with cactus or succulent potting mix, or make your own from two parts ordinary potting soil to one part coarse grit, sand or perlite; the RHS goes as far as a quarter grit by volume for container lavender.^[8] Ordinary potting compost on its own holds far too much water.

Ease the plant out of its nursery pot and tease the outer roots loose if they are circling. Set it so the top of the root ball sits level with the soil surface, backfill, and firm it gently. Planting it deeper than it was growing invites stem rot.

Water it in thoroughly, let it drain, and empty the saucer. Then put it in the brightest window you have and leave it alone until the top two inches of soil are dry.

Propagating from cuttings

Take cuttings in late spring or early summer from soft, non-flowering shoots.

Cut a three- to four-inch length just below a leaf node. Strip the leaves from the lower two inches, leaving four or five at the top. A cutting with leaves buried in the compost will rot before it roots.

Rooting hormone is optional and improves the strike rate. Dip ‘N Grow is a liquid concentrate that keeps better than the powders.

Push the cutting into a small pot of damp, gritty mix, firm around it, and cover the pot with a clear bag held off the leaves by a couple of sticks. Lavender cuttings need humidity to root and rot if the bag touches the foliage.

Keep them in bright, indirect light rather than full sun, which will cook them inside the bag. Vent the bag for a few minutes every couple of days.

Roots take three to six weeks; Colorado State’s estimate is about three, Utah State’s runs to 40 days.^[7] Tug gently: resistance means it has taken. Pot on once roots show at the drainage hole.

Light

Lavender needs six or more hours of direct sun, and this is the requirement most indoor growers cannot meet.^[9]

A south-facing window is the only orientation that reliably delivers it, and even then winter days fall short in most of the US. An east or west window gives roughly half what the plant wants, which is why Colorado’s floor for potted lavender is four to five hours of sun, survival rations rather than a recommendation.^[3]

The symptoms of too little light are specific: long bare stretches of stem between leaves, pale foliage, growth leaning hard toward the glass, and no flowers. Rotating the pot a quarter turn every few days fixes the leaning and nothing else.

A full-spectrum LED hung 6 to 12 inches above the plant for 12 to 16 hours a day makes up the difference through winter.^[1] Our indoor lighting guide covers what to buy.

Water

Water thoroughly, then let the top two inches of soil dry completely before watering again. In practice that is every week or two in summer and considerably less in winter. Herbs as a class do not tolerate wet feet, and lavender least of all.^[1]

Water the soil, not the plant. Wet foliage in still indoor air invites the fungal problems lavender is already prone to.

Empty the saucer every time. Lavender left standing in water will rot, and by the time the symptoms appear, wilting foliage on a plant with wet soil, the roots are usually already gone; the pathogen behind that collapse is the same Phytophthora root rot Colorado warns growers about, and the prescription is identical: do not overwater.^[2]

Underwatering is the more recoverable mistake. A dry, slightly wilted lavender revives within hours. An overwatered one often does not revive at all.

Temperature, winter rest and humidity

Ordinary room temperature suits it through the growing season, and cool does not hurt it: English lavender is hardy to zone 5 in the ground,^[6] so a chilly room just slows it down. What it appreciates is a proper winter rest, cool, bright and on the dry side,^[10] the regime an unheated sunroom or a cold bright bedroom provides free. Keep it away from radiators and heating vents.

Humidity is the underrated problem. Lavender prefers dry air,^[10] and a humid kitchen or bathroom will give it grey mold and root problems regardless of how carefully you water. Air movement matters more than any gadget: leave space around the pot instead of crowding it against other plants, and run a small fan nearby if the room is still.

Soil, pH and feeding

Beyond drainage, lavender wants soil near neutral and tolerates genuinely alkaline: the extension consensus is an optimum around 6.5 to 7.5, with tolerance stretching toward 8.^[11] Most potting composts are formulated on the acidic side, and lavender in acidic soil takes up nutrients poorly and slowly weakens. A spoonful of garden lime mixed through the pot at planting nudges the mix the right direction; lavender’s association with limy ground is old and well documented.^[4]

Test rather than guess if the plant is struggling for no obvious reason. Our guide to testing soil pH covers four methods, and a cheap probe is enough for this.

Feeding is nearly a non-subject: lavender likes soil low in nutrients and generally needs no feeding at all;^[8] for pots, a half-strength liquid feed once or twice in spring and summer is the ceiling, and nothing in winter.^[1] A fed-up lavender grows soft, floppy and less fragrant, the same trade every aromatic herb makes.

Repot when roots fill the pot and water races through, stepping up one size into fresh gritty mix; compacted old mix drains worse exactly as the plant grows larger and more vulnerable.

Questions & answers

Can lavender survive indoors year-round?

Yes, in the right window. It needs six hours of direct sun or a grow light, a gritty fast-draining mix, and water only when the top inches have dried. The plants that fail indoors die of generosity, rich compost, frequent water, warm dim corners, not of neglect. A cool, bright, slightly ignored lavender is a happy one.

Will lavender flower indoors?

Only if the light is real. With a genuine south exposure or a 12-to-16-hour grow light, a dwarf English lavender can bloom in season; below that threshold you get healthy silver foliage and no spikes.^[5] The foliage itself is fragrant, so the plant earns its sill either way, but if flowers are the point, budget for the lamp.

Why is my indoor lavender dying?

The two killers, in order: wet roots and dark rooms. A lavender wilting in damp soil has root rot and is usually past saving,^[2] so cut watering and repot into gritty mix if any firm white roots remain. A leggy, pale plant is light-starved; move it or add a lamp. Dry air, cool rooms and missed waterings are almost never the cause.

Is lavender toxic to cats and dogs?

Yes, mildly. The ASPCA lists lavender as toxic to cats, dogs and horses; the compounds are linalool and linalyl acetate, and the typical signs are nausea, vomiting and loss of appetite.^[12] A pet that samples a leaf is very unlikely to be harmed, but a determined chewer and a lavender plant should live in different rooms.

Does potted lavender come back every year?

The plant is a perennial shrub, hardy to zone 5 in the ground,^[6] so yes, given light. Outdoors, move containers against a sheltered wall for winter. Indoors, give it the cool bright rest described above and it resumes in spring. What it will not survive is a winter of warm rooms, low light and regular watering, which reads to the plant as a long, dark swamp.

Once the plant is established, caring for indoor lavender covers pruning, feeding and the two-a-year cutback that stops it going woody, and how to use lavender covers drying, cooking and infusions. Its regime-mate on the dry Mediterranean sill is rosemary, which shares both the light bill and the death-by-kindness failure mode.

References

1. Iowa State University Extension. Growing herbs indoors: south window or full-spectrum light 12–16 hours on a timer; clay pots dry well between waterings; herbs do not tolerate wet soils; light feeding at half or quarter strength. https://yardandgarden.extension.iastate.edu/how-to/growing-herbs-indoors ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

2. Colorado State University Extension, fact sheet 7.245, Growing lavender in Colorado: cultivar table with ‘Munstead’ 12–18 in and ‘Hidcote’ 12–16 in, both zone 5; full sun and slightly alkaline soil; Phytophthora root rot, “do not over-water”; cuttings root in about three weeks. https://extension.colostate.edu/topic-areas/yard-garden/growing-lavender-in-colorado-7-245/ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

3. PlantTalk Colorado, #1015, Growing lavender in containers: provide at least four to five hours of sun. https://planttalk.colostate.edu/topics/annuals-perennials/1015-lavender/ ↩︎ ↩︎ ↩︎

4. University of Maryland Extension. Lavender: Mediterranean origin, thrives in full sun and lean, limy, well-drained soil. https://extension.umd.edu/resource/lavender ↩︎ ↩︎

5. University of Minnesota Extension, Ask Extension response on indoor lavender: dry indoor air and low winter light make indoor culture marginal; give the highest-light spot available and water only enough to keep roots from drying. https://ask.extension.org/kb/faq.php?id=608922 ↩︎ ↩︎

6. North Carolina State Extension Plant Toolbox: Lavandula angustifolia (zones 5a–9b) and Lavandula stoechas (zones 8a–9b); L. × intermedia ‘Provence’ flagged best for humid conditions. https://plants.ces.ncsu.edu/plants/lavandula-angustifolia/ ↩︎ ↩︎ ↩︎ ↩︎

7. Utah State University Extension. English lavender in the garden: germination begins in 14–21 days, seeds sprout best at 70°F on a heat mat; cutting roots form in 30–40 days; pH 6.5–7.5. https://extension.usu.edu/yardandgarden/research/english-lavender-in-the-garden ↩︎ ↩︎ ↩︎

8. Royal Horticultural Society. Lavender: growing guide: cultivar seed varies from the parent; containers with up to 25% coarse grit; lavender likes soil quite low in nutrients and generally needs no feeding. https://www.rhs.org.uk/plants/lavender/growing-guide ↩︎ ↩︎ ↩︎ ↩︎

9. North Carolina State’s full-sun definition for lavender: six or more hours of direct sunlight daily (Plant Toolbox, link above). ↩︎

10. Michigan State University Extension. A sampling of fresh herbs: overwinter potted lavender in a sunny window, cool and on the dry side; lavender prefers low humidity and well-drained soil; optimum pH 6.5–7.5. https://www.canr.msu.edu/news/start_summer_off_with_a_sampling_of_fresh_herbs_basil_lavender_and_rosemary ↩︎ ↩︎

11. Extension pH consensus: MSU and Utah State give 6.5–7.5 optimum; NC State neutral to alkaline (6.0–8.0); Penn State’s production guidance runs pH 6–8. https://extension.psu.edu/agritourism-diversification-lavender-production ↩︎

12. ASPCA Animal Poison Control, Lavender: toxic to dogs, cats and horses; linalool and linalyl acetate; nausea, vomiting, inappetence. https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/lavender ↩︎