Spring is the perfect time to start growing herbs indoors on your balcony, patio, or windowsill. Fresh basil, parsley, and coriander taste infinitely better than supermarket packets, and honestly, it's easier than most people think. Whether you've got a tiny flat or a modest garden space, this guide will help you avoid the mistakes that trip up most beginners.
Get the Light Right
Most edible herbs need at least 6 hours of direct sunlight daily. A south-facing windowsill or balcony is ideal in the UK — that's where you'll catch the strongest midday light. If your space only gets 3-4 hours of sun, don't panic. Leafy greens like lettuce and spinach are surprisingly tolerant of partial shade and will still produce well.
If natural light is genuinely limited, an LED grow light running 14-16 hours daily will do the job without expensive equipment. Position it about 15cm above your seedlings and adjust as they grow.
Avoid Overwatering — It's the #1 Killer
The biggest mistake beginners make is keeping soil constantly wet. Herbs hate soggy roots. Water when the top of the soil feels dry to your finger — usually every 2-3 days, depending on temperature and humidity. Use a small watering can with a removable rose so you can control exactly how much water reaches the soil.
Always use proper potting compost, never garden soil. Garden soil compacts, drains poorly, and often contains pests and disease. Peat-free compost mixed with a little perlite or sand creates the drainage herbs love.
Use the Right Container Size
Planting in containers that are too small forces you to water constantly and restricts root growth. For most herbs, a 10-15cm pot is perfectly adequate. For larger plants like rosemary, go up to 20cm. You don't need anything fancy — terracotta pots work brilliantly and cost just a few pounds.
Make sure there's a drainage hole in the bottom of every pot. If water pools on the surface after watering, the drainage is poor and roots will rot.
Start Small and Keep It Simple
Beginners often plant 10 different varieties and get overwhelmed. Pick two or three herbs you actually use — basil, parsley, and chives are foolproof. Once you've got those producing, expand. A seed collection with pre-selected herb varieties saves decision fatigue and comes with everything you need.
Harvest Properly to Keep Plants Productive
Pinch leaves from the top of the plant rather than stripping entire stems. This encourages bushier growth instead of tall, leggy plants. Morning harvests are best — herbs are fully hydrated and flavour is strongest. Never take more than a third of the plant at once.
For basil, pinch out the flowering tips as soon as they appear. This keeps energy going into leaf production rather than seeds.
Keep Costs Down
You don't need expensive kit. Repurposed yoghurt pots work fine for starting seeds — just poke drainage holes in the bottom with a fork. Save old newspapers for lining trays (they help retain moisture). Collect rainwater in a bucket if you can — it's free and plants genuinely prefer it to tap water.
The only essentials are seeds, compost, pots, and water. Everything else is a bonus. Label your pots with a permanent marker or cheap bamboo plant labels so you don't forget what you've planted.
Growing herbs indoors is genuinely satisfying and will save you money on supermarket packets within a month or two. Stick to these basics, be patient, and you'll have fresh herbs all spring and summer.