Tomatoes grow happily in pots if you get a few basics right: a big pot, a quality potting mix, a full-sun spot, steady water, and a compact type to start with. Containers dry out and run low on food faster than garden beds, so they reward a regular watering and feeding habit. Get that rhythm going and a balcony, courtyard or sunny step can keep you in tomatoes right through the warm season. In very hot, exposed spots, give the pot itself a little afternoon shade so the roots do not cook.
You do not need a backyard to grow a good tomato. A single pot in a sunny spot will do it, which is part of why tomatoes are the plant that turns so many balconies and courtyards into productive little gardens.
The catch is that a pot is a smaller, faster-drying world than a garden bed, so it asks for a bit more attention. Get the pot, the mix and the watering right, and the rest is mostly enjoying the harvest.
Why a pot suits a tomato, and you
A pot gives you control that an open bed cannot. You choose the mix, you can move the plant to chase the sun or duck a storm, and the soil in a dark pot warms quickly in spring, which tomatoes love. In high summer the reverse is worth a thought, since a dark pot on paving or a balcony rail can overheat the roots, so a lighter-coloured pot or a little shade on the pot itself helps in the hottest spots. For a balcony, courtyard, rental or small yard, a pot is often the easiest way in.
It also keeps the whole thing close at hand. A tomato by the back door tends to get watered, picked and noticed, which is half the battle with any crop.
Start with a big pot and a good mix
Go as big as you reasonably can. A pot of around 15 to 20 litres suits a compact or dwarf tomato, while a full-size or indeterminate variety wants 30 litres or more. Bigger holds more moisture and gives the roots somewhere to go, which makes everything easier. Whatever you choose, make sure it has good drainage holes so the roots never sit in water.
Fill it with a quality potting mix, not soil dug from the garden. Garden soil sets hard in a pot and drains poorly, while a good potting mix stays open and free-draining. It is the cheapest thing you can do to set the plant up well.
One safety note for when you open the bag: Australian potting mix can carry the bacteria behind Legionnaires' disease, so it is worth following the simple safety steps when handling potting mix:
- Open the bag in a well-ventilated spot, away from your face.
- Dampen the mix first to keep the dust down.
- Wear a P2 or N95 mask and gloves.
- Wash your hands when you are done.
Water is the make-or-break
Watering is where most potted tomatoes are won or lost. Pots dry out far faster than beds, especially in summer and on a hot balcony, so check them often and water before they wilt. In peak heat that can mean a drink every day. A pot on a sunny balcony can be damp at breakfast and dry by the time you get home, so a finger pushed into the mix tells you more than any watering schedule.
Aim for steady, even moisture rather than a cycle of bone-dry and soaking. Uneven watering is a common cause of blossom-end rot, the dark sunken patch that appears on the base of the fruit, because uneven moisture can disrupt the plant's ability to move calcium into the developing fruit, and those same swings also lead to splitting. A layer of mulch on top of the mix, even in a pot, helps hold that moisture between drinks.
Feed little and often
A tomato in a pot runs through the food in the mix faster than one in the ground, so it needs feeding to keep cropping. Even when a potting mix has a starter feed, a tomato in a pot can run through those nutrients quickly, so a regular liquid feed keeps it cropping.
A fish emulsion or a fish and seaweed blend suits them well, used at the label rate through the growing season. Once flowering and fruiting are underway, a potassium-leaning feed such as sulphate of potash can help support fruit set. It is tempting to pour on more in the hope of more tomatoes, but go steady rather than heavy, since a flood of feeding tends to give you lush leaf at the expense of fruit.
Pick a type that suits a pot
Compact types are the easy choice for containers. Determinate and bush tomatoes grow to a set size and usually crop over a shorter window, which makes them an easy fit for a pot on a balcony or step. Dwarf types stay compact too, though some keep cropping more like a small indeterminate plant, so it is worth checking the packet. Many cherry tomatoes are content in pots too, and a tumbling type can spill nicely over the side of a tall container.
You can grow a tall indeterminate tomato in a pot as well, as long as the pot is large and you give it a sturdy stake or a small frame at planting time. Just know it will want more water and more room than a compact type. For a first go in a pot, a compact cherry type is hard to beat, since they tend to crop early and keep coming.
Pots, zone by zone
The handling shifts a little by zone: chase warmth in the cool areas, shield pots from fierce heat in the hot ones, and keep the water steady through dry summers. One of the quiet joys of a pot is that you can move it, which makes all of that easier.
- Tropical (Darwin, Cairns): grow through the dry season, and give pots a little afternoon shade as the heat builds.
- Subtropical (Brisbane, Sunshine Coast, Coffs Harbour): a long warm season suits potted tomatoes, with airflow to ease humidity.
- Temperate (Sydney, Melbourne, Canberra): start pots in a warm spot, where the dark sides soak up spring warmth.
- Mediterranean (Perth, southern WA, Adelaide): excellent for pots, though hot dry spells mean steady water and a thick mulch.
- Arid and semi-arid (Alice Springs, Mildura): water often and shift pots out of the fiercest afternoon sun.
- Cool and alpine (Tasmanian highlands, Orange, Ballarat): a pot you can move under cover lets you stretch a short season at both ends.
A pot of tomatoes on a sunny step is one of the most rewarding small gardens there is. You can browse our tomato seeds for compact and cherry types that suit containers, and if you are starting a balcony or courtyard patch, our small-space and balcony edible garden guide is a good companion.
Get the pot big, the mix good and the watering steady, and the plant does the rest. By high summer, a few minutes with the watering can each evening turns into a bowl of tomatoes on the bench.
Frequently asked questions
What size pot do I need for a tomato?
Bigger is better. A roomy pot of about 20 litres suits a compact tomato, and a tall indeterminate type wants 30 litres or more. A small pot dries out and runs short of food too quickly, so err on the generous side.
Can I use soil from my garden in the pot?
It is best not to. Garden soil sets hard and drains poorly in a container, which leads to soggy roots and struggling plants. A quality potting mix stays open and free-draining, and it is well worth the small cost.
How often should I water a potted tomato?
Often, and steadily. Pots dry out faster than beds, so check daily in warm weather and water before the plant wilts. Even, consistent moisture also helps prevent blossom-end rot and splitting.
Why does my potted tomato have a dark patch on the bottom of the fruit?
That is blossom-end rot, usually caused by uneven watering rather than a disease. Keeping the moisture steady, with a mulch to even things out, is the best way to avoid it.
Which tomatoes are best for pots?
Compact determinate, bush and dwarf types are the easiest, along with many cherry and tumbling tomatoes. Tall indeterminate types can work in a large pot with a stake, but they need more water and room.
Do potted tomatoes need feeding?
Yes. The starter feed in a potting mix can run down faster than a hungry tomato needs, so a regular liquid feed such as a fish and seaweed blend keeps it cropping. Feed steadily rather than heavily to avoid all leaf and little fruit.
Related growing guides
- The Best Vegetables and Herbs for Containers (and the Pot Sizes They Need)
- Balcony and Courtyard Veg: What to Grow in Pots in Australia
- Small-Space Food Gardening: Big Harvests from a Balcony or Courtyard
Ready to plant? Browse our Vegetable Seeds.