How can I grow Roma tomatoes without staking or caging?

Make rows of mounds, plant your tomatoes at the side of the mounds and close to the lowest point. Water gently in the rows, and let the plants crawl up the mounds.

Weed barrier would be far better than plastic. Still doesn't prevent the ground dweller nibblers such as rolypolys from taking a bite. If you only have money for the weed barrier, then that's what it will be........and lots of food grade diatomaceous earth to go after the little ground dwellers.

try growing them in hanging baskets