What Does It Mean to Pinch Out Tomatoes?
Pinching out tomatoes refers to the horticultural practice of removing the small side shoots that grow from the 'axil' – the point where a leaf stem joins the main stem of the plant. This technique is primarily applied to indeterminate varieties of tomato plants, which continue to grow and produce fruit throughout the season.
By removing these 'suckers', you're not just tidying up the plant; you're strategically directing its energy and resources away from producing more foliage and stems, and towards developing larger, riper fruits. It also helps improve air circulation around the plant, which can reduce the risk of fungal diseases. Understanding when and how to pinch is crucial for maximising your tomato harvest.
- Pinching removes side shoots (suckers) from tomato plants.
- It's essential for indeterminate tomato varieties.
- Directs plant energy towards fruit development.
- Improves air circulation, reducing disease risk.
- Key to a healthier, more abundant harvest.
Indeterminate vs. Determinate Tomato Varieties
The first step to successful tomato pruning is identifying your plant type. Indeterminate varieties grow and fruit continuously, often reaching heights of 2-3 metres (or more) if not stopped. They benefit most from pinching out suckers as they have a long growing season to support. Determinate varieties, on the other hand, grow to a fixed size, set their fruit over a shorter period, and then stop growing. These types generally do not require pinching out, as removing their side shoots can actually reduce the overall yield. It's vital to know which type you are growing to avoid damaging your plants or reducing their potential.
Crucially, understanding your tomato variety is the foundation of effective pruning.
Why Pinch Out Tomato Plants?
The primary reason for pinching out tomatoes is to concentrate the plant's energy. Without intervention, indeterminate tomatoes can become a tangled mass of vines, with each sucker potentially developing its own leaves, flowers, and even fruit. While this might seem like more fruit, it often results in smaller, less developed fruits and a plant that is more susceptible to pests and diseases due to poor airflow.
By removing these extraneous shoots, you encourage the plant to channel its nutrients and water into the main stem and the developing fruit trusses. This leads to fewer, but larger and more flavourful, tomatoes ripening more consistently. It also makes the plant more manageable, particularly if you are growing them in confined spaces or containers.
How to Perform the 'Pinching Out' Technique
Performing the 'pinch out' technique is straightforward, but requires a gentle touch and the right timing. You'll need your fingers or, for a cleaner cut that minimises disease transmission, a sharp, sterilised knife or secateurs. Always ensure your tools are clean before use, especially if moving between plants, to prevent spreading any issues.
When to Start Pinching
Begin pinching out suckers when they are small, ideally no more than 5-10 cm long. At this stage, they are easy to remove with just your fingers. Waiting too long means the suckers will have developed their own leaves and may even be producing flowers, which will take more energy from the plant to remove and potentially leave a larger wound. Regularly inspecting your plants, ideally once a week during the growing season, will allow you to catch these suckers early.
The earlier you remove suckers, the less energy the plant expends on them.
The Pinching Process Explained
Locate the small side shoot growing in the 'V' between the main stem and a leaf branch. For young suckers, simply grasp the shoot between your thumb and forefinger and give it a gentle twist or pinch. It should snap off cleanly. If the sucker is a little larger, or you prefer to use a tool, make a clean cut just above the shoot, close to the main stem, being careful not to damage the main stem itself.
For indeterminate tomatoes, it's common practice to train the plant to a single or double main stem. This means removing *all* suckers that appear below the first fruit truss, and then deciding whether to remove those above it to focus energy on the existing fruit, or to allow one or two main stems to continue growing. If allowing a double stem, select a strong sucker that forms low down and treat it as a second main stem, removing all other suckers.
If you're growing tomatoes in a greenhouse or a particularly damp climate, consider removing suckers from the lower part of the plant even if you aren't strictly 'pinching out' to improve air circulation right down to the soil level.
What About Fruiting Trusses?
Once the plant has set a few trusses of fruit, you might consider pinching out the growing tip of the main stem(s). This is done late in the season, typically around 4-6 weeks before the first expected frost. This final pinch signals to the plant that its growing season is ending, encouraging it to put all its remaining energy into ripening the existing fruit rather than producing new flowers that are unlikely to mature.
Alternatives to Strict Pinching and When Not To Do It
While pinching out is a beneficial technique for many gardeners, it's not the only way to manage tomato plants, and there are specific scenarios where it's not advisable. Understanding these alternatives and exceptions can lead to more flexible and successful growing strategies.
The Case for Minimal or No Pinching
Not everyone pinches out their tomatoes, and many still achieve good results. For determinate varieties, as mentioned, pinching is generally counterproductive. Similarly, if you have ample space, a long growing season, and are growing outdoors in a warm climate, you might find that allowing indeterminate plants to grow more naturally, perhaps with simple support like staking or caging, yields a slightly larger but potentially less concentrated crop of smaller fruits.
This less intensive approach can be appealing if you find the regular task of pinching time-consuming or if you're less concerned about having the absolute largest fruits. It can also be a good strategy for growing tomatoes in pots, where managing water and nutrients is already a key focus, and the plant's size might be naturally limited.
The decision to pinch depends on your specific growing conditions and goals.
When NOT to Pinch Out Tomatoes
The most obvious time not to pinch is if you have determinate 'bush' varieties. Beyond that, avoid pinching if your plants are stressed due to drought, poor soil, or disease. A stressed plant needs all its foliage to photosynthesise and recover. If you are growing tomatoes from seed for the first time, or are in a region with a very short growing season, you might want to forgo pinching to maximise the number of fruits that have a chance to mature before the weather turns.
Also, consider the overall health and vigour of your plant. If a sucker is growing in a way that complements the plant's structure, or if it's the only viable new growth on a struggling plant, it might be worth leaving it. The goal is always a healthy, productive plant, not necessarily adherence to a rigid pruning rule.
If you're unsure about a particular sucker, leave it. You can always remove it later. It's harder to re-attach a branch that has been removed.
Alternative Support Structures
Instead of relying solely on pinching to manage growth, consider different support methods. Staking involves tying the main stem to a vertical stake as it grows. Caging uses a wire cage around the plant to provide support. These methods help keep the plant upright and improve airflow without necessarily removing side shoots, although some thinning of lower leaves might still be beneficial for air circulation.
Some growers even use a 'florida weave' method for larger numbers of plants, where stakes are placed between plants and horizontal twine is woven through them to support multiple stems. Each of these methods offers a way to manage plant growth and support fruit development, with pinching being an optional additional step depending on the variety and desired outcome.
Maximising Harvest: Beyond Pinching
Pinching out is a vital technique for many tomato growers, but it's just one piece of the puzzle when it comes to achieving a bountiful harvest. Several other factors significantly influence the success of your tomato plants, from the moment you plant them to the final days of ripening.
Soil Preparation and Feeding
Tomatoes are hungry plants and thrive in rich, well-drained soil. Before planting, incorporate plenty of organic matter like compost or well-rotted manure. This improves soil structure, water retention, and nutrient availability. During the growing season, regular feeding is essential, especially for indeterminate varieties that produce fruit over a long period.
A balanced fertiliser is suitable for young plants, but once flowering begins, switch to a feed higher in potassium and phosphorus to encourage fruit development. Avoid excessive nitrogen, which can lead to lush leafy growth at the expense of fruit. For tomatoes grown in pots, a liquid feed every 2-3 weeks is often necessary, as nutrients leach out of containers more quickly.
Consistent watering is as important as feeding for healthy fruit development.
Watering and Mulching Strategies
Tomatoes require consistent moisture. Irregular watering can lead to a range of problems, including blossom end rot (a dark, sunken spot on the bottom of the fruit) and cracked fruit. Aim to keep the soil evenly moist, but not waterlogged. Watering at the base of the plant, rather than overhead, helps prevent fungal diseases like blight.
Mulching is highly beneficial for tomato plants. Applying a layer of organic mulch, such as straw, compost, or wood chips, around the base of the plant helps to retain soil moisture, suppress weeds, and regulate soil temperature. This consistency in soil conditions is crucial for preventing stress and ensuring optimal fruit set and development. It also reduces splashing of soil onto the lower leaves, which can spread disease.
Pest and Disease Management
Regular vigilance is key to managing common tomato pests and diseases. Early detection allows for prompt action, preventing widespread damage. Look out for common issues such as aphids, whiteflies, slugs, blight, and mildew. Improving airflow through techniques like pinching and pruning lower leaves can significantly reduce the risk of fungal infections. For pests, a strong jet of water can dislodge aphids, or you might resort to insecticidal soaps or neem oil for more stubborn infestations. Always choose the least toxic option first.
When to Harvest
Finally, knowing when to harvest your tomatoes is the culmination of all your efforts. Tomatoes are ready to pick when they have reached their mature colour (red, yellow, orange, or even purple, depending on the variety) and feel slightly soft to the touch, yielding gently to pressure. If you are concerned about frost or pests, you can pick tomatoes when they are just beginning to show their colour and allow them to ripen indoors at room temperature. Enjoy the fruits of your labour!