Now that your tomato plants are growing tall and working on producing healthy tomatoes, it’s time to prune your indeterminate tomatoes!
Unlike determinate tomatoes that hit their mature height and set all their fruit at once, indeterminate tomato varieties are vining plants that continue to extend in length throughout the growing season.
In order to improve airflow and less disease, bigger fruit, and earlier ripening, it is important to prune tomatoes “which produce new leaves and flowers continuously through the growing season.” Read more at https://bonnieplants.com/blogs/garden-fundamentals/how-to-prune-tomatoes/
However, it is important to avoid these all-too-common mistakes:
1. Pruning determinate tomato plants.
2. Pruning when the plants are wet.
3. Pruning with dull or dirty tools.
4. Waiting too long to prune tomato plants.
5. Over pruning.
6. Not topping the main stems at the end of the growing season.
7. More information at https://www.bobvila.com/articles/pruning-tomato-plants/
Here is a great video about pruning indeterminate tomatoes: https://www.youtube.com/watch?v=mPf7a96eOlQ