Why Container Herb Growing Works So Well
Container growing is one of the most accessible and rewarding ways to cultivate herbs. It works on a balcony, a kitchen windowsill, a patio, or even under a grow light in a flat with no natural light at all. Containers also give you control — you can tailor the soil, drainage, and positioning for each plant's specific needs.
This guide walks you through everything you need to know: choosing containers, the right compost, which herbs to start with, and how to keep them healthy.
Choosing Your Containers
Almost any container will work as long as it has drainage holes at the bottom. Without drainage, roots sit in waterlogged soil and rot. Here's what to consider:
- Terracotta pots: Excellent for Mediterranean herbs (rosemary, thyme, sage) as they're porous and help prevent overwatering. They dry out faster, which suits drought-tolerant species.
- Plastic pots: Retain moisture longer — better for moisture-loving herbs like basil, mint, and parsley. Lightweight and economical.
- Window boxes: Great for growing several herbs together along a windowsill or balcony rail. Ensure they are securely fixed.
- Recycled containers: Colanders, old wooden crates, or even tin cans can all be repurposed — just add drainage holes as needed.
Size matters: A minimum diameter of 15–20 cm is suitable for a single herb. For mint and larger plants like lemon balm, go bigger. Shallow-rooted herbs like chives and basil can share a wide, medium-depth tray.
Getting the Compost Right
Regular garden soil is generally too dense for containers and may harbour pests or disease. Instead, use:
- Peat-free multipurpose compost as a base for most herbs.
- Add perlite or horticultural grit (roughly 20–30% of the mix) for Mediterranean herbs that prefer sharper drainage.
- Avoid very rich, fertiliser-heavy composts for herbs like thyme and rosemary — they produce more flavour when grown lean.
Best Herbs for Container Growing
| Herb | Container Size | Light Needs | Watering |
|---|---|---|---|
| Basil | Medium (20cm+) | Full sun | Regular, keep moist |
| Mint | Large (grow alone) | Part sun/shade | Regular |
| Chives | Small–medium | Full sun | Moderate |
| Thyme | Small–medium | Full sun | Low, let dry out |
| Rosemary | Large | Full sun | Low |
| Parsley | Medium–large | Part–full sun | Moderate |
| Coriander | Medium, deep | Part sun | Moderate |
Positioning Your Pots
Most culinary herbs originate from sunny, warm climates and want as much light as possible:
- A south-facing windowsill or balcony is ideal for basil, rosemary, thyme, and sage.
- East or west-facing spots work well for parsley, chives, mint, and coriander.
- Indoor herbs on windowsills should be rotated every few days to prevent leaning toward the light.
Watering and Feeding
Overwatering is the number-one killer of container herbs. Before watering, push your finger an inch into the compost. If it feels damp, wait. If it's dry, water thoroughly until it drains from the bottom.
Feeding is important because nutrients leach out of containers faster than garden soil:
- For leafy herbs like basil, parsley, and mint, feed with a diluted general liquid fertiliser every 2–3 weeks during the growing season.
- Avoid heavy feeding of woody Mediterranean herbs — it encourages lush, less flavourful growth.
Harvesting to Encourage Growth
Counterintuitively, the more you harvest, the better your herbs grow. Regular harvesting:
- Prevents plants from going to flower (bolting), which triggers flavour decline.
- Encourages the plant to produce more bushy, leafy growth.
- Keeps plants compact and manageable in their containers.
Always cut stems just above a leaf node and never remove more than one-third of the plant at once.
Common Problems and Solutions
- Yellow leaves: Usually overwatering or insufficient light.
- Leggy, pale growth: Not enough light — move to a brighter spot or supplement with a grow light.
- Wilting despite moist soil: Root rot from waterlogging — repot into fresh compost with better drainage.
- Aphids: Blast off with water or apply a dilute soap spray to affected stems.
Container herb growing is enormously rewarding, and the learning curve is gentle. Start with two or three reliable varieties, pay attention to what they're telling you, and expand your collection as your confidence grows.