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22. How often should you fertilize tomato plants?

The frequency with which tomato plants should be fertilized depends on several factors, including the fertilizer used, the soil in which the tomatoes are growing, and the growth stage of the plants.The fertilization needs of tomato plants can vary from season to season, and it is important to be flexible to respond to specific conditions in the garden.

  • Basic fertilization: Before tomato plants are even planted in the ground, the soil should be well prepared by incorporating organic fertilizer (green waste, horn shavings, manure, algae extracts, etc.) or compost. This ensures a solid basic supply of nutrients. Organic fertilizers also have the advantage of providing slow-release nutrients that are available over a longer period of time. They also promote soil structure and soil life and help preserve the environment as they are generally more environmentally friendly than synthetic fertilizers. 


  • Long-term fertilizer: Slow-release fertilizers that release nutrients over a longer period of time can also be used. These may only need to be added once at the start of the season. These include, for example: B. Zeolite (mineral that can store nutrients in the soil and then release them to plants as needed), algae extracts, sheep's wool, sheep's wool pellets, compost or long-term fertilizer sticks.


  • liquid fertilizer: If liquid fertilizer is used, you can start fertilizing the tomatoes about 2 to 4 weeks after planting. Then pay attention to the instructions for use on the packaging.


  • growth phase: The fertilizer needs of tomato plants change throughout their life cycle. During the growth phase, when plants develop many leaves and shoots, they need more nitrogen. During fruit formation, they require more phosphorus and potassium.


  • frequency: As a rule, it is better to fertilize more often with a weaker fertilizer solution rather than fertilize less often with a strong solution. This prevents overfertilization and the risk of nutrient burn.


  • observation: It is important to observe the plants carefully. If any signs of nutrient deficiency are noticed, such as yellow leaves, slow development or poor fruit production, fertilizer may need to be applied more often.


  • Soil testing: It is also helpful to conduct a soil test to determine the exact nutrient needs of tomato plants. This can help with the correct selection and dosage of fertilizers.


It's also important to note that too much fertilizer can be harmful, so a conservative approach is often safer.

Grafik "Schon gewusst!"

Zu viel Dünger kann auch schädlich sein, daher ist eine zurückhaltende Herangehensweise oft besser.

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