How often should you water tomatoes? Our tips

Watering is an important factor in all crops, whether vegetables or other crops. The objective is to provide the plant with the right amount of water at each stage of its growth while respecting a certain frequency. Find out in this article what is the best way to water your tomatoes!

Get to know your surroundings!

First of all, we must keep in mind that water is precious. It is essential to save as much as possible. However, water is life. Ask yourself what would happen if you didn't drink anything for several days... it's the same thing for your tomato plants and your other vegetables which will suffer cruelly from a lack of water.

Soil texture matters. Sandy ground generally holds less water and drains faster than clay, while poorly drained clay may remain too wet. Observe your own soil and apply suitable mulch when it is already moist, keeping material away from the stems.

Sun, wind, temperature and actual rainfall change watering needs in every region. Check whether rain reached the soil beneath leaves and mulch. Pots have limited reserves and greenhouse plants normally receive no rain, so check these more often.

My method for optimizing the watering of your tomatoes

1. Never water the aerial part of the plant

You should know that watering the aerial part of the tomato plant is not recommended, as this can constitute a source of disease. In more humid and cooler regions, some people prefer to cover their tomato plants with a frame or a tunnel to protect them from rain which could cause mildew.

The name “beefsteak” or “cœur de bœuf” does not guarantee resistance to late blight. Check the exact variety’s characteristics. A well-ventilated rain shelter can reduce some risks but does not replace regular inspection.

2. Keep moisture consistent throughout the crop

Water after planting and maintain reasonably even moisture while plants establish, flower and develop fruit. Do not sharply reduce watering simply because the first tomatoes have formed. Weather, root volume and fruit load change the requirement. Containers may need daily checks in hot weather.

3. Observe the leaves and soil moisture carefully!

Wilting can indicate dry soil, but waterlogged roots or another problem can cause similar symptoms. Check the root zone first. Large moisture fluctuations can contribute to fruit splitting and blossom end rot; a crack or dark patch alone does not prove overwatering.

Move mulch aside and feel the soil a few centimetres down in the root zone. Wait if it is still moist; if drying, water slowly without leaving standing water. Liquid feeds are not substitutes for water and should not automatically be added at every watering.

Manual or automatic watering?

You will have understood, we must therefore favor watering at the base of the plant but should we opt for manual or automatic watering? There is no right answer!

Use a watering can or low-flow hose to water slowly at the base. No weekly volume suits every garden: account for soil, plant size and container. Check afterwards that the roots received water. A damp surface can hide a dry rootball.

If you have the budget and the desire to automate your watering, you can install a drip system. For my part, it is what I set up in the greenhouse, and I am simply delighted with it! I bought a programmer placed under the tap, a kit with hose and nozzles and a pressure reducer to prevent the nozzles from coming off on their own. Nothing more ! Here are some photos of my installation.

Watering in a greenhouse

Greenhouse tomatoes normally receive no rain and can lose water quickly in warm conditions. Check soil or compost regularly and ventilate against overheating. Inspect drip emitters and the wetted root zone even when using a timer.

A greenhouse may extend the season but does not guarantee April planting or harvests until November. Climate, variety, exposure and shelter type all matter. An unheated greenhouse still needs attention to unsuitable night temperatures.

Choose a watering arrangement that suits your plants and garden. Careful hand watering can be sufficient; automatic systems need inspection too. The priority is steady moisture without waterlogging throughout production.