The Complete Guide to Growing Herbs Indoors All Year

If you want to grow herbs indoors all year, you’re in the right place. Fresh herbs on demand — no more paying for sad, half-wilted supermarket packets — is one of the most satisfying things a home gardener can achieve. This guide is written for complete beginners as well as anyone who has tried before and watched their basil die within a week. We cover everything: choosing the right herbs, setting up your space, soil and containers, watering and feeding, light (including grow lights), pest control, harvesting, and advanced techniques that keep plants producing for months at a stretch.

What This Guide Covers

• Why it makes sense to grow herbs indoors all year and which herbs suit it best
• Choosing containers and the right potting mix
• Light requirements — windowsill vs. grow lights
• Watering, humidity, and feeding schedules
• Temperature and airflow — the overlooked factors
• Sowing from seed vs. buying starter plants
• Harvesting for maximum regrowth
• Pest and disease identification and fixes
• Advanced tips for a continuous, productive indoor herb garden

Grow Herbs Indoors All Year: Understanding the Basics

To successfully grow herbs indoors all year, you first need to understand what herbs actually want. At their core, herbs are plants that prioritise leaf production — most of them come from sun-drenched, relatively dry Mediterranean hillsides or warm tropical regions. That background tells you a lot: they want plenty of light, they hate sitting in soggy soil, and they generally prefer warmth with good air circulation.

The indoor environment differs from a garden in four key ways: less intense light, lower humidity (especially in winter with heating running), still air, and a restricted root zone. Once you understand these four constraints, every decision you make — from picking a container to setting a watering schedule — becomes logical rather than guesswork.

The good news is that all four constraints are manageable. That’s exactly why so many people successfully grow herbs indoors all year even in small flats with no outdoor space at all.

The best herbs for indoor growing

Not every herb thrives in pots on a windowsill. Here’s an honest breakdown of which ones perform best and which are worth skipping, at least until you’re confident.

Choosing the Right Containers and Potting Mix

When you grow herbs indoors all year, the container is your herb’s entire world. Get this part right and everything else is easier. The two non-negotiables are drainage holes and an appropriate size.

Container size and material

Herbs are not fans of over-potting. A basil plant in a pot that’s too large sits in cold, wet compost that its roots haven’t reached yet — a recipe for rot. As a general rule, start herbs in 10–15 cm (4–6 inch) pots and only move up a size when you see roots escaping from the drainage hole.

Terracotta is our favourite material for Mediterranean herbs like rosemary, thyme, and oregano. The porous walls allow excess moisture to escape, which mimics the fast-draining soil those herbs evolved in. Plastic pots retain moisture longer, making them a better match for mint, parsley, and basil which prefer slightly more consistent moisture. Whatever material you choose, always place a saucer underneath — and always empty that saucer within 30 minutes of watering so roots never sit in standing water.

The right potting mix

Standard multi-purpose compost works, but it often retains too much moisture for Mediterranean herbs. We recommend mixing standard compost with 20–30% perlite or horticultural grit for any herb that prefers dry conditions. For moisture-loving herbs like mint, standard multi-purpose compost is fine on its own.

Avoid using garden soil in pots. It compacts, drains poorly indoors, and introduces pests and diseases that thrive in the controlled warmth of a home.

Getting the Light Right — Windowsill vs. Grow Lights

Light is the factor that determines whether you can genuinely grow herbs indoors all year or whether your plants slowly decline through autumn and winter. A south-facing windowsill in summer can deliver 6–8 hours of direct sun — perfectly adequate for almost every herb. But by November, the same windowsill might deliver only 3–4 hours of weak, low-angle light, and that’s simply not enough for basil or rosemary.

Making the most of natural light

Place herbs as close to the glass as possible without letting leaves touch cold windowpanes in winter, which can cause frost damage on very cold nights. Rotate pots a quarter turn every few days so all sides of the plant receive even exposure. Keep windows clean — dirty glass can reduce light transmission noticeably.

East-facing windows provide gentle morning sun and suit moderate-light herbs like parsley, mint, and chives well. West-facing windows get afternoon sun and work reasonably well. North-facing windows in the northern hemisphere receive very little direct sun and are generally unsuitable unless you supplement with grow lights.

Using grow lights to grow herbs indoors all year

A quality LED grow light is the single biggest upgrade you can make if you want to grow herbs indoors all year regardless of the season. Modern full-spectrum LED panels are energy-efficient, run cool enough to sit close to plants, and last for tens of thousands of hours.

For herbs, you’re looking for a light in the 2,000–5,000 lux range measured at canopy level. Position the light 20–30 cm (8–12 inches) above the tops of your herbs and run it for 14–16 hours per day using a simple plug-in timer. This simulates a long summer day and keeps growth consistent even in the depths of December.

A single modestly-priced LED panel measuring roughly 30 x 30 cm can cover a small tray of six to eight herb pots, making it practical even in a kitchen with limited space. The Royal Horticultural Society’s herb growing guidance also notes that supplemental lighting is increasingly common in home herb gardens and well worth the modest running cost.

Watering, Humidity, and Feeding Your Indoor Herbs

Overwatering kills more indoor herbs than any other single cause. When you grow herbs indoors all year, you’ll find that watering needs change dramatically with the seasons — plants drink much less in winter when growth slows, and central heating makes the situation more complex by drying the air while keeping the soil at a temperature that doesn’t encourage rapid drying.

How to water correctly

The best method is the finger test: push your fingertip about 1 cm into the compost. If it feels moist, wait. If it feels dry, water thoroughly until water runs freely from the drainage holes, then empty the saucer. This approach works for every herb and every season.

Water in the morning where possible. This gives any water that splashes onto leaves time to dry before the cooler night temperatures arrive, reducing the risk of fungal problems. Use water that’s at room temperature — cold tap water can shock basil roots in particular.

Humidity — the often-forgotten factor

Central heating in winter drops indoor humidity to levels that can stress tropical herbs like basil. Signs of low humidity include brown leaf tips and curling leaves. Grouping plants together naturally raises local humidity as they transpire. Placing pots on a tray filled with pebbles and a little water (keeping the pot bottoms above the water line) also helps without the risk of waterlogging roots.

Feeding schedule

Herbs grown in pots need feeding because nutrients wash out of the compost with every watering. A balanced liquid fertiliser applied at half the recommended strength every two to three weeks during the growing season (roughly March to October) is sufficient for most herbs. In winter, reduce feeding to once a month or stop entirely if plants are barely growing.

High-nitrogen feeds push lots of leafy growth but can dilute flavour — particularly in Mediterranean herbs. A balanced NPK fertiliser (something like a 5-5-5 or 10-10-10) strikes the right compromise. The University of Maryland Extension’s indoor herb guide provides solid, research-backed feeding advice worth reading alongside our guide here.

Temperature, Airflow, and Seasonal Adjustments

Temperature is a surprisingly nuanced factor when you grow herbs indoors all year. Most culinary herbs are happiest between 15°C and 24°C (60–75°F) — comfortably within the range most homes are kept at. The real problems occur at the extremes.

Cold spots and drafts

Windowsills can be dramatically colder than the rest of the room, especially at night in winter. Slide pots back from the glass on cold nights or place a folded cloth between the pot and the cold glass to act as insulation. Cold drafts from gaps in window frames are particularly damaging to basil, which shows cold stress within hours as blackening leaf edges.

Radiators placed directly below windowsills are a double-edged sword. The warm air rising from them can help herbs stay warm but also dries them out very rapidly and causes leaf scorch if pots are directly above the heat source. A few centimetres of distance makes a significant difference.

Airflow and preventing fungal disease

Still, warm, humid air is the perfect environment for mould and fungal issues like powdery mildew. Good airflow is your best prevention. A small USB fan running on low for a few hours a day does the job without chilling plants. It also strengthens stems — plants grown with a gentle breeze develop thicker, sturdier stems, which helps them support more leaf growth.

Whenever you grow herbs indoors all year, seasonal adjustment is part of the routine. In summer, you may need to move plants away from intense midday sun through glass (which can scorch leaves). In winter, you’ll consolidate plants on the sunniest windowsill or switch on your grow light.

Sowing from Seed vs. Buying Starter Plants

Both approaches work well when you want to grow herbs indoors all year. The choice depends on your patience, budget, and which herbs you want.

Starting from seed

Starting from seed is satisfying and gives you access to a wider range of varieties — you can grow lemon basil, purple basil, or Vietnamese coriander that you’d never find as a pot plant in a supermarket. The downsides are time (basil takes 2–3 weeks to germinate, parsley can take up to 4 weeks) and the need for warmth during germination — most herb seeds want 18–22°C to sprout reliably.

Sow seeds thinly into small modules or a seed tray filled with fine seed compost, barely cover with compost or vermiculite, and keep moist and warm. A warm spot on top of a fridge or a heated propagator works well. Once seedlings are 5 cm tall and have their second set of true leaves, pot them up individually.

Using supermarket herb pots

Those dense herb pots sold in supermarkets are a popular shortcut, and they genuinely work — with the right treatment. Those pots typically contain dozens of seedlings crammed together, grown fast for the supermarket shelf rather than for longevity. When you get them home, split the root ball into three or four clumps and repot each clump into its own pot with fresh compost. Give them a week in lower light to recover from the stress of being moved, and they’ll reward you with months of growth.

This approach is particularly effective for basil, mint, and chives. It lets you grow herbs indoors all year from day one, without waiting weeks for seeds to germinate.

Harvesting for Maximum Regrowth

Harvesting is where most beginners go wrong — either they pick too timidly (leaving the plant to bolt) or too aggressively (stripping it bare). When you grow herbs indoors all year, the goal is sustained production, not a single big harvest.

The one-third rule

Never remove more than one-third of the plant at a single harvest. This leaves enough leaf area for photosynthesis to continue at a useful rate. For bushy herbs like basil, oregano, and lemon balm, always cut just above a pair of leaves — the plant will then produce two new shoots from that point, giving you exponential regrowth over time.

Pinch out flower buds as soon as you spot them. Once a herb flowers (bolts), it redirects energy from leaf production to seed production, and the flavour of the leaves deteriorates quickly. Regular pinching keeps plants in a productive vegetative state for much longer.

Herb-by-herb harvesting tips

Basil: Harvest from the top down, always cutting above a leaf node. Never strip leaves from a bare stem.

Mint: Cut whole stems back to about 5 cm above the soil. Mint is vigorous and will regrow quickly. Harvest entire stems rather than individual leaves.

Chives: Snip leaves from the outside of the clump, cutting them to about 2–3 cm above soil level. The inner leaves continue growing.

Rosemary and thyme: Snip soft, new growth from the tips of stems. Avoid cutting back into old, woody growth, which regrows very slowly.

Parsley: Harvest outer stems from the base to allow the inner, younger stems to develop. This is the opposite of chives — take from the outside in.

The Brooklyn Botanic Garden’s guide to growing herbs indoors offers additional harvesting advice that aligns well with this approach, and it’s worth bookmarking as a reference.

Pest and Disease Identification and Fixes

Indoor herbs are not immune to pests. The controlled warmth of a home can actually help certain pests thrive year-round when they’d normally die off outdoors in winter. If you grow herbs indoors all year, you’ll encounter at least one of these issues — and knowing what to look for means you can act before a minor problem becomes a plant-killing infestation.

Common pests and what to do

Fungus gnats: Tiny dark flies hovering around the soil are the adult stage; the larvae live in the compost and damage roots. They thrive in consistently wet compost — the fix is almost always to let the soil surface dry out more thoroughly between waterings. Yellow sticky traps catch adults and help you gauge how bad the infestation is.

Aphids: Small soft-bodied insects (green, black, or white) clustering on new growth and under leaves. Blast them off with a firm spray of water in the sink, or wipe them away with a damp cloth. A spray of diluted neem oil (follow product instructions for dilution) is effective for persistent infestations on herbs you’re not harvesting immediately.

Spider mites: Nearly invisible mites that cause fine stippling on leaves and eventually produce silky webbing. They thrive in hot, dry conditions — raising humidity and improving airflow is your first line of defence. Neem oil spray helps here too.

Whitefly: White moth-like insects that flutter up when you disturb the plant. Yellow sticky traps and neem oil are both effective. Ensure good airflow as they dislike moving air.

Common diseases

Powdery mildew: White powdery coating on leaves, usually caused by poor airflow and high humidity with low light. Remove affected leaves, improve ventilation, and space plants further apart. A very dilute solution of bicarbonate of soda in water can suppress mild cases.

Root rot: Soft, brown, mushy roots and a plant that wilts despite moist soil. Almost always caused by overwatering or poor drainage. If caught early, you can unpot the plant, trim away rotten roots with clean scissors, let the root ball dry for an hour, and repot into fresh, well-draining compost.

Advanced Tips for a Thriving Indoor Herb Garden

Once you’re comfortable with the basics and you can reliably grow herbs indoors all year, these strategies will take your indoor herb garden from functional to genuinely impressive.

• Succession sowing: Sow a small pot of fast-bolting herbs like coriander every three to four weeks. By the time the first pot is spent, the next one is ready. This eliminates the frustrating ‘gap’ in supply.
• Hydroponic countertop systems: Closed-loop hydroponic herb kits allow you to grow herbs indoors all year without soil altogether. Plants grow in a nutrient solution under built-in LED lights. They’re more expensive upfront but produce impressively fast growth and are nearly pest-free.
• Root division for free plants: Mint, chives, and lemon balm can be divided every six months. Simply unpot the clump, pull or cut it in half, and repot each half. You double your stock at zero cost.
• Companion planting in pots: Basil and chives share a pot happily and some gardeners find the chives deter aphids from the basil — though results vary. Keep rosemary, thyme, and oregano together as they all prefer the same dry, bright conditions.
• Using a grow tent: A small grow tent (even a 60 x 60 cm one) with a reflective interior and a hanging LED dramatically increases light efficiency. It’s ideal for those who want to grow herbs indoors all year on a serious scale in a spare bedroom or utility room.
• Feeding with worm castings: A top-dressing of worm castings (vermicompost) every couple of months provides a slow-release nutrient boost and improves compost structure. It’s particularly beneficial when you want to grow herbs indoors all year without relying heavily on liquid feeds.
• Keeping a simple log: Note when you sowed, potted up, fed, and harvested each plant. Patterns emerge quickly — you’ll notice that your basil needs watering every five days in summer but only every nine days in winter, for example. This kind of data is far more useful than generic watering schedules.
• Air layering and cuttings: Basil, mint, and lemon balm root easily in a glass of water. Cut a 10 cm stem just below a leaf node, strip the lower leaves, place in water, and roots appear within 7–14 days. This is how you grow herbs indoors all year for almost nothing, constantly renewing your stock from existing plants.
• Adjusting grow light schedules seasonally: Even when using grow lights, matching roughly to seasonal day length helps Mediterranean herbs that need a slight winter rest. Run lights for 16 hours in summer and 12–14 hours in winter to maintain healthy growth without burning out your plants.

Frequently Asked Questions

Which herbs are easiest to grow herbs indoors all year for a complete beginner?

Mint, chives, and parsley are the three most forgiving choices. They tolerate lower light levels than Mediterranean herbs, handle occasional over- or under-watering better, and bounce back quickly from neglect. If you want to grow herbs indoors all year with minimal fuss, start with these three and add more varieties as your confidence builds.

How do I grow herbs indoors all year if I have no south-facing window?

A quality full-spectrum LED grow light is the practical solution. Even a single modestly-sized panel can support six to eight herb pots and keeps growth consistent year-round regardless of window orientation. Run it on a timer for 14–16 hours a day. Many successful indoor herb gardeners who grow herbs indoors all year in north-facing flats rely entirely on grow lights and report excellent results.

Why do my supermarket herbs keep dying indoors?

Supermarket herbs are grown intensively — dozens of seedlings packed into one small pot, pushed hard to look lush on the shelf. They’re essentially disposable unless you intervene. The fix is to repot them immediately into fresh compost, split overcrowded root balls into individual clumps, and give them a bright spot with consistent moisture. Treated this way, they genuinely thrive and let you grow herbs indoors all year from a simple supermarket purchase.

How often should I harvest to keep herbs productive?

Little and often is the answer. Harvest small amounts every week or two rather than stripping the plant every few months. Regular harvesting — always taking no more than one-third of the plant — encourages bushy, productive growth and delays bolting. When you grow herbs indoors all year, a consistent light harvest schedule keeps plants in a productive vegetative state far longer than sporadic heavy cutting.

Final Thoughts

Learning to grow herbs indoors all year is one of the most practical and rewarding things you can do as a home gardener. It’s not complicated once you understand what herbs actually need: enough light, well-draining compost, careful watering, and regular harvesting. Start with two or three easy herbs like mint, chives, and parsley, get comfortable with the rhythm of caring for them, and then expand your collection. A grow light removes the biggest seasonal barrier — low winter light — and makes it genuinely possible to grow herbs indoors all year in any home. Work through the steps in this guide, keep a simple log of what works for your space, and you’ll have fresh herbs on the kitchen counter every single day of the year.