to lay its eggs.
It’s an interesting garden experiment, but it shouldn’t be treated as guaranteed cabbage-worm control.
If cabbage white butterflies are causing serious problems, fine insect mesh or row covers provide much more dependable protection by physically preventing the butterflies from reaching the leaves.
For better protection:
Check underneath leaves regularly.
Look for butterfly eggs and young caterpillars.
Use fine insect mesh when necessary.
Rotate crops between seasons.
Keep brassica beds clean and easy to inspect.
The eggshell trick can be an additional experiment rather than your only
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