1. To save more money. You can grow crops for years without spending a cent on seeds!
2. For fun. There is certainly pleasure in nurturing a plant from seed, learning how it propagates, and actually harvesting the seeds. It’s quite empowering, actually!
3. To preserve biodiversity. By saving heirloom seeds that have been passed on through generations, you can help preserve important crop diversity.
4. To create new varieties with particularly desirable qualities. You can create crops uniquely adapted to your backyard microclimate. Also, you can select seed from the plants with better flavor, greater frost hardiness, earliest blooms, prettiest color, and more.
5. When you are entirely the master of your seed, you know where it has been, from what plant it originated, what has been sprayed on it, what soil it grew in, and important details about how it will grow in your garden.
Source: One Green Generation