Yes, tomatoes love growing in the Trudrop planters because of the consistent watering. For an 18″ Pot, we would recommend growing tomato varieties that stay short such as a Bush Earl Girl, Celebrity, Tiny Treats or Bush Goliath – any variety that stays under 3 feet tall. Here’s a great informational link from Bonnie Plants on tomato varieties available in the U.S. Speak to your local grower or garden center to find the correct variety for you.