Besides the financial savings of garden vs. store-bought produce, there are so many more benefits that are hard to quantify:
Health - After a few hours in the garden, we sleep better and gardening therapy is a great stress-reducer, and our chemical-free produce is less likely to make us sick, and we are getting more fruits & veggies in our diet. Our fresh, perfectly ripe veggies are more nutrient-dense, plus we get free vitamins from the sun while tending the garden and it provides a good workout. So less sleep meds, headache meds, stomach meds, dr. appointments, trips to the gym
Social - Quality family time growing and processing food, as well as having something to share with others. We know a family that is struggling. They have their pride, and would never accept a bag of groceries from us, but would gladly use an armload of garden produce.
Environment - We get our produce about 25 steps from our house, so thats helping reduce the carbon footprint. We also use less gas because we dont make so many 20-mile round-trips to the grocery store.
Free storage - I have no place to put store-bought bulk potatoes or carrots, but the garden will keep them for me until I need them.
Educational - My son is learning:
Science (life cycle of plants, weather, nutrients plants need, how to store food properly)
Math (X amount of seeds at 4 apart will make a row how long?)
Problem-solving (Where do we put the corn so it doesnt shade the beans?)
Respect for the earth
Patience
Dealing with disappointment (the watermelon plants died - so deal with it and move on)
Skills that he may need to survive someday
How good a really fresh vegetable tastes - so hes eating more of them.
(OK, DH and I are learning this stuff, too)
For our 2010 Garden:
Seeds, plants, tools: $156
Freezing, canning, dehydrating supplies: $89
Benefits of having a garden: Priceless