Ruqayyah Snyder
Tomatoes are a popular choice for home gardeners, even if you only have space for a pot on a balcony or patio. They are easy to grow and very productive, but like any plant, success depends on positioning them in the right spot and using the right soil preparation. Tomatoes need lots of sun and warmth to grow, so make sure they get at least six hours of sunshine each day. They also need a decent-sized pot with good drainage to ensure they get enough water and nutrients throughout the growing season.
| Characteristics | Values |
|---|---|
| Pot material | Plastic, terracotta, glazed terracotta, self-watering |
| Pot colour | Black (for early season), pale (for summer) |
| Pot size | Minimum 15-20 litres, 40-50cm diameter, 18L or larger |
| Soil | Aged cow and sheep manure, pelletised poultry manure, rock minerals, potash, coir or shredded coconut husk, liquid kelp, fish emulsion, organic mulch |
| Sunlight | Minimum 6 hours, preferably 6-8 hours |
| Watering | 3 times a day in hot weather, self-watering pots |
| Fertiliser | Liquid feeds, seaweed solution, fish extract, banana skin tea, worm leachate tea, compost tea, weed/herb teas |
| Common mistakes | Choosing too small a pot, starting from seed, planting too early in the season, inadequate sunlight, overfeeding |
| Tomato types | Grape Tomato, Roma, Patio Prize, Dwarf, Patio |
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What You'll Learn
Pot size and type
When growing tomatoes in pots, it is important to choose a pot that is large enough to support the plant's growth and allow access to sufficient water and nutrients. A common mistake is to use a pot that is too small, which can hinder the plant's access to water and nutrients. Therefore, it is recommended to use a pot with a capacity of at least 15 to 20 litres. Larger containers are preferable as they can hold more soil and reduce the risk of the soil drying out in hot weather.
The pot should be at least 40 cm in diameter, with some sources recommending a diameter of 40 to 50 cm for indeterminate or staking tomatoes. For dwarf tomatoes, a 45L bag or a smaller pot may be sufficient. If you are planting multiple tomatoes in one pot, ensure that each plant has enough space, nutrients, water, and good air circulation. Generally, one large pot can accommodate three to four tomato plants.
Plastic pots are a popular choice due to their lightweight and durable nature. They are easier to move around than ceramic pots and offer good drainage and depth. Black plastic pots are ideal for capturing heat during the early growing season, while paler colours or reflective materials can help deflect heat during the hotter summer months. Self-watering plastic pots are also an option, especially if you plan to be away for short periods.
Other options include terracotta pots, which should be sealed with a water-based sealer to reduce moisture loss, and glazed terracotta pots, which are more water-efficient but heavier to move. Old foam fruit boxes, at least 30 cm deep, can also be used for small bush tomato varieties.
Regardless of the pot type, ensure that your container has drainage holes at the bottom. If your container lacks drainage holes, drill three to five holes before planting. Additionally, consider the positioning of your pot, as tomatoes require generous amounts of sunlight to thrive. Place your pot in an area that receives six to eight hours of direct sunlight daily, preferably during the morning and afternoon.
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Soil preparation
Firstly, choose a suitable pot with a capacity of at least 15-20 litres to ensure your tomato plant has enough space to grow and access sufficient water and nutrients. Make sure the pot has drainage holes to prevent waterlogging. Plastic pots are a popular choice due to their lightweight and good drainage properties, but you can also consider self-watering pots, terracotta pots, or recycled containers like old foam fruit boxes.
Next, prepare your soil mix. While you can use a premium potting mix, creating your own blend can provide extra nutrients for your tomato plants. Start by forking over the soil to loosen it and removing any large root chunks from previous crops. Aged cow and sheep manure is an excellent option to add nutrients and organic matter to the soil. You can also incorporate rock minerals for trace elements. If you want to make a custom mix, try using equal parts soil, compost, and coir (shredded coconut husk) soaked in liquid kelp and fish emulsion. This blend will provide a light and nutritious medium that drains well while retaining water and nutrients.
Before planting your tomatoes, it's essential to wait until the weather is consistently warm, and there's no more risk of frost. This timing can vary depending on your location in Australia. It's also crucial to place your pots in a sunny spot, as tomatoes need at least six hours of sunlight each day to thrive.
Once you've prepared your soil and positioned your pots, you can plant your tomatoes. Remember to plant them slightly deeper than they were in their seedling containers to encourage a robust root system. After planting, add a thin layer of organic mulch to help retain moisture, suppress weeds, and keep the roots cool during the warm summer months.
By following these soil preparation steps, you'll be well on your way to successfully growing delicious and healthy tomatoes in your pots.
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Planting
Tomatoes are vigorous plants that need a decent-sized pot with good drainage. A common mistake is to use a container that is too small, which can cause the plant to struggle to access water and nutrients. Choose a pot with drainage holes in its base, and a minimum volume of 15-20 litres. If you are planting dwarf or patio varieties, you can go as low as 18 litres, but for indeterminate tomatoes, you will need a pot of at least 40-50cm diameter.
Plastic pots are a good choice as they are lightweight and don't dry out too fast, but still offer good drainage and depth. Black plastic pots are great for catching the early season heat, but in the middle of summer, paler colours are better to deflect the heat. Self-watering plastic pots are a great option if you are short on time, and they will take care of your plant's water needs when you are away.
If you are planting in a balcony or patio, consider compact small-fruiting varieties such as cherry tomatoes or a compact Patio tomato, which has been bred for container growing. You can plant three or four plants in one large pot, but for the best results, plant just one tomato in each pot so it has access to lots of nutrients and water. Place the pot in a spot where the plant will get at least six hours of direct sunlight per day, preferably in the morning and afternoon. Tomatoes are warm-season plants, so they need a growing season of at least three months, but they can be grown year-round in warm, frost-free regions.
Before planting, prepare the soil by forking over the soil and removing any old roots from the last crop. Add a combination of aged sheep and cow manure, which contains lots of nutrients and organic matter that tomatoes love. You can also add rock minerals for trace elements. Then, fill the pot with a good-quality vegetable potting mix. Look for one that meets Australian Standards, such as Supersoil Professional Herb & Vegie Potting and Planting Mix.
When planting, place a tomato climbing frame or several stakes in the pot to support the plant as it grows. Push a four-foot-tall stake about 10cm from the plant. As the tomato grows, tie it carefully to the stakes with garden twine or pieces of pantyhose. Don't put the stakes in after the plant has begun to grow, as this can risk damaging the roots.
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Sunlight
When growing tomatoes in pots, it is important to place them in an area that receives ample sunlight. Aim for six to eight hours of direct sunlight each day, preferably in the morning and afternoon. Morning sunlight helps kickstart the plant's growth for the day, while afternoon sunlight extends the photosynthesis period.
The amount of sunlight received can vary depending on the time of year and your location in Australia. In warm, frost-free regions, tomatoes can be grown year-round, while in temperate and cooler areas, planting should occur from late winter to spring. Avoid planting too early in the season, as sudden frost can damage the plants.
The choice of pot can also impact the amount of sunlight received. Plastic pots are a popular option due to their lightweight and good drainage properties. Black plastic pots are ideal for capturing the early season heat, while paler pots are preferable during the hotter summer months as they deflect heat. If using a black pot in summer, consider lining the outside with a reflective material to reduce heat absorption.
Additionally, ensure that your tomato plants have adequate support structures, such as stakes or cages, to guide their growth towards the sunlight. By providing sufficient sunlight and following the recommended planting practices, you can successfully grow tomatoes in pots in Australia.
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Watering
Pot Size and Type
Choose a pot with a capacity of at least 15 to 20 litres to ensure sufficient water retention throughout the growing season. Larger containers are preferable as they hold more soil and reduce the risk of the soil drying out. Consider using a pot with a capacity of 40 to 50 litres for indeterminate or staking tomatoes. Plastic pots are an excellent choice due to their lightweight and good drainage capabilities. Self-watering plastic pots are a convenient option, especially if you plan to be away for a few days. If using terracotta pots, seal them with a water-based terracotta sealer to minimise moisture loss.
Drainage
Ensure your pot has drainage holes at the bottom. If it doesn't, drill three to five holes before planting. Adequate drainage is essential to prevent waterlogging, which can be detrimental to tomato plants.
During very hot weather, tomato plants may require watering up to three times a day. They are warm-season plants and require a consistent water supply to thrive. In the warm summer months, mulch is critical to help retain moisture and keep the roots cool. A layer of organic mulch over the surface of the potting mix can help maintain moisture levels and suppress weeds.
Liquid Feeds
Liquid feeds are ideal for potted tomatoes as they boost growth without affecting drainage. Apply liquid fertilisers such as seaweed solution or fish extract fertilisers every few weeks. Banana skin tea, worm leachate tea, and compost tea are also beneficial, providing additional nutrients and beneficial microorganisms. Always dilute liquid feeds to a weak tea colour before application.
When watering, avoid splashing the leaves, as this can promote fungal diseases. Water the soil directly, ensuring it receives a thorough soaking. Water early in the morning or late in the afternoon to minimise water loss due to evaporation.
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Frequently asked questions
Plastic pots are a good choice as they are lightweight and don't dry out too quickly. They also offer good drainage and depth. Black plastic pots are great for catching early-season heat, but in the middle of summer, paler colours that deflect heat are better. Old, foam fruit boxes are also suitable for small bush types, if at least 30cm deep.
A common mistake is to use a container that is too small, which means the plants can't get enough water and nutrients. Use a pot that is at least 40cm across and has a volume of 15 to 20 litres.
Start with a base of coir or shredded coconut husk that has been soaked in liquid kelp and fish emulsion. Then, add equal parts soil and compost. You can also use a premium potting mix, but make sure it has good drainage.
Tomatoes need a lot of water, especially in hot weather, when they may need to be watered up to three times a day. Self-watering pots are handy if you're growing tomatoes on a balcony or patio.
