Today we planted Fox Cherry Tomatoes and Brandywine Tomatoes. A tomato is considered a fruit because of how they grow.This is because botanically a tomato has seeds, and all fruits have seeds. You care for them by watering them, making sure they have enough warmth and sunlight. You transplant tomatoes when they get their first true real leaves. A Heirloom tomato is an open-pollinated heirloom cultivar of tomato.