If you are talking about the small cages you purchase at the local walmart then you have a problem. These plants will overgrow these quite quickly and receive no support. These small commercial cages are a waist of money as they do little good. For these plants, the best cages are made from 4"x4" square field fence or better yet stake these. We grow several hundred heirloom tomato plants each year and cages are not an option. We use 6' wooden stakes. Good luck and enjoy the flavor of your heirloom beefsteak tomatoes.

Blueflint