We haven't bought garlic,
We haven't bought garlic, cherry tomato or butternut squash/(never planted - came from compost) plants for years because they come up every year somewhere! We also occasionally get romaine lettuce and dill, and (although never planted) pumpkin and watermelon plants came up one year. This also happens with many flowers, bushes and trees that come up in mulched areas, especially black walnut trees. It is a lot of fun and wonderful to see all the plants grow without the work of planting them!