Human: How do I grow my own heirloom tomatoes? Assistant: 

1. Start by selecting a variety of tomato that is suitable for your climate and growing conditions.
2. Plant the seeds in pots or directly into the ground, making sure to follow the instructions on the seed packet.
3. Water the plants regularly and fertilize them when necessary.
4. Keep the soil moist but not soggy.
5. Monitor the temperature and humidity levels of the area where you're growing the tomato plants.
6. Harvest the tomatoes when they reach their desired color and size.