When you start using trellis netting will depend on the specific plants you are growing and the conditions in which they are growing. Here are a few general guidelines to consider:

  1. Consider the size and growth habit of the plants you are growing: If you are growing small, fast-growing plants, you may want to start using trellis netting as soon as they start to get tall enough to need support. For larger, slower-growing plants, you may be able to wait longer before installing trellis netting.
  2. Think about the conditions in which the plants are growing: If you are growing plants in a windy or exposed location, you may want to start using trellis netting sooner to help keep them upright and prevent them from falling over. In more protected locations, you may be able to wait longer.
  3. Consider the type of trellis netting you are using: Some types of trellis netting are more flexible and can be used to support plants at an earlier stage of growth. Other types of netting may be more rigid and may be better suited for supporting more mature plants.

Overall, the best time to start using trellis netting will depend on the specific needs of your plants and the conditions in which they are growing.