No garden? No problem. Some of the most productive vegetable growing happens in pots on balconies, patios, and doorsteps — tomatoes cascading from a sunny wall, salad leaves in a window box, herbs by the kitchen door. Containers are not a compromise; for many crops they are genuinely excellent.
The rules are slightly different from growing in the ground — mostly about water and pot size — and this guide covers exactly what changes, what stays the same, and which crops to start with.
| Crop | Minimum pot size | Notes |
|---|---|---|
| Lettuce / salad leaves | 15 cm deep window box | Cut-and-come-again; sow every 3 weeks |
| Cherry tomatoes | 10 litres (15–20 better) | Determinate types easiest; stake well |
| Zucchini | 20 litres | One plant per pot; bush varieties |
| Peppers | 10 litres | Loves warm pots against a sunny wall |
| Carrots | 30 cm deep | Short/round varieties; sandy compost |
| Cucumbers | 15 litres + trellis | Bush types for pots; water daily |
| Garlic | 20 cm deep | Plant cloves 10 cm apart in October |
| Herbs (basil, parsley) | 15–20 cm pots | The easiest win of all |
Step 1: Go big on pot size — it matters more than anything
The number one container mistake is pots that are too small. Small pots dry out in hours, overheat roots, and starve plants — nearly every "my container vegetables failed" story starts here. The table above gives minimums; bigger is always better, and one large pot outperforms three tiny ones.
Material matters too: terracotta looks beautiful but dries fast; plastic and glazed ceramic hold moisture far better. Whatever you use, drainage holes are non-negotiable — waterlogged roots rot in days. Dark pots warm roots nicely in spring but can overheat in heatwaves; move them into afternoon shade in extreme heat.
Step 2: Use proper compost — never garden soil
Fill pots with good multipurpose or vegetable compost, never soil dug from the garden — garden soil compacts in pots, drains badly, and brings weeds and disease. For thirsty crops like cucumbers and zucchini, mix in water-retaining granules or a handful of vermiculite.
Compost in pots runs out of food faster than garden soil — typically 4–6 weeks. After that, feed regularly (see Step 4). At season's end, do not throw old compost away: refresh it with a third new compost and use it for a less hungry crop next year.
Step 3: Master container watering
This is the skill that makes or breaks container growing. Pots dry from all sides, and a big plant in a small pot on a hot day can need water twice daily. Check by pushing a finger 3 cm in — water when dry at that depth, not on a schedule.
Three tricks that transform watering: mulch the surface with straw or compost to slow evaporation; group pots together so they shade each other; and water in the morning so leaves dry by evening. Self-watering pots with reservoirs are worth every cent for thirsty crops and holiday-proofing.
Step 4: Feed little and often
Because watering washes nutrients out of pots, container vegetables are hungrier than their in-ground cousins. Once plants are established (about a month after planting), feed every 1–2 weeks with liquid fertiliser: balanced feed for leafy crops like lettuce, potassium-rich tomato feed once fruiting crops flower.
Do not feed seedlings or freshly potted plants — new compost has enough food for the first weeks, and early feeding burns tender roots. Pale, slow plants in midsummer are usually just hungry; a fortnight of regular feeding transforms them.
Step 5: Pick the right crops for pots
Almost everything can grow in a pot, but some crops are genuinely happier there. Best bets: lettuce and salad leaves (fast, shallow-rooted), cherry tomatoes (love warm pots), peppers (extra warmth against a wall), herbs, and garlic (avoids winter waterlogging).
Think twice about: sweetcorn (needs a block for pollination), large pumpkins (one plant eats a patio), and long carrots in shallow pots — though short Paris Market types in deep pots are excellent. Match the variety to the container: look for "patio", "bush", or "dwarf" on the seed packet.
Step 6: Use vertical space
Small footprint does not mean small harvest. Grow up: cucumbers on a trellis, tomatoes on canes or strings, beans on a wigwam of canes in one big pot. A square metre of vertical growing can out-produce several square metres of flat bed.
Wall-mounted planters and hanging baskets suit trailing crops like cherry tomatoes (tumbling varieties) and strawberries. Just remember: small, elevated containers dry fastest of all — check them daily in summer.
Step 7: Overwinter and refresh smartly
At season's end, do not just abandon pots. Empty annuals onto the compost, scrub pots that held diseased plants, and store terracotta somewhere frost-free (it cracks in hard freezes). Hardy herbs like rosemary and thyme can stay out with a sheltered position.
October is actually planting time for containers too: garlic cloves go into deep pots now for a summer harvest, and winter salads grow happily in a sheltered window box. See the October checklist for the full autumn container list.
Troubleshooting: container problems
Plants wilt every afternoon despite morning watering: The pot is too small for the plant, full stop. Move up a size — a zucchini in a 10-litre pot will always struggle; in 20+ litres it thrives. As an emergency measure, stand the pot in a saucer of water on hot days.
Yellow leaves on container plants: Usually hunger (nutrients washed out) or overwatering in pots without drainage. Check drainage holes first, then start a regular feeding routine — our Plant Doctor guide to yellow leaves walks through the full diagnosis.
White crust on compost surface: Salt and mineral buildup from hard water and fertiliser. Scrape it off, flush the pot thoroughly with water, and consider rainwater for a while. Harmless if caught early.
Everything dries out while you are away: Group pots in shade, mulch thickly, stand them in trays of water, and invest in a simple drip-irrigation timer for holidays. Self-watering pots with reservoirs buy you several days of grace.
What to do this October
October container jobs: plant garlic in deep pots now; sow winter salads in window boxes under cover; bring tender pots (citrus, tender herbs) into shelter before frost; empty and scrub pots that held diseased tomatoes; refresh tired compost with new material for spring. It is also the perfect month to buy pots — end-of-season sales make October the cheapest time to size up for next year.
Frequently asked questions
What is the cheapest way to start container gardening?
Buckets and storage tubs with holes drilled in the bottom work brilliantly — a 10-litre builder's bucket grows a fine cherry tomato. Fabric grow bags are cheap, store flat over winter, and air-prune roots for healthier plants.
Can I use garden soil in pots to save money?
Not recommended — it compacts, drains poorly, and carries weeds and disease. One bag of decent multipurpose compost fills several medium pots and is the best money you will spend. Mix old and new compost 50/50 in year two to economise.
How do I stop pots blowing over?
Use wide, heavy pots for tall plants, group them together, and place the heaviest pots as windbreaks on the exposed side. A tomato in a light plastic pot on a windy balcony will sail — a ceramic one will not.
Do containers need saucers?
On balconies above neighbours, yes — nobody appreciates drainage water on their laundry. Empty saucers after rain though; plants standing permanently in water rot. In a garden, saucers are optional and often more trouble than help.
What to do this October
October container jobs: plant garlic in deep pots now; sow winter salads in window boxes under cover; bring tender pots (citrus, tender herbs) into shelter before frost; empty and scrub pots that held diseased tomatoes; refresh tired compost with new material for spring. It is also the perfect month to buy pots — end-of-season sales make October the cheapest time to size up for next year.
Related guides
- How to Grow Tomatoes at Home: Beginner's Guide — the classic container crop
- How to Grow Lettuce at Home: Beginner's Guide — perfect for window boxes
- How to Grow Garlic: Plant in October, Harvest in Summer — plant in pots right now
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