What are the ways to save money in gardening?

1. Avoid buying potting mix by making your own potting soil
2. Compost your food scraps to make your own soil
3. Avoid buying seed germinating trays by using tofu trays and other recycled food trays to germinate seeds
4. Avoid buying pots and containers by re-using plastic milk containers with the top cut off, tetra pak with the top cut off, yoghurt containers, plastic soda bottles etc.
5. Avoid buying plants from the store by germinating plants from seed yourself
6. Collect rainwater for your plants to avoid using municipal water
7. Re-use water from rinsing vegetables/rice to water your plants to minimize the use of municipal water