When I was in grade school, my mother and I began the tradition of planting a small vegetable garden in our backyard each spring. The patch was strategically placed next to the cement slab upon which the air conditioning unit rested; deemed undesirable and away from the reach of the chained up dog during his ‘œdoing-his-business’ time.

From what I recall, we only planted tomatoes, cucumbers, green onions and pumpkins. The first three choices were dictated by my mother (apparently, our 3-5 recommend daily servings were limited to the only vegetables she liked) and the last one was my decision’¦ after all, when you watch a pumpkin grow, the end of October provides a natural goal with a deadline. Even as a kid, I liked my activities to have purpose.

Looking back, I realized how unhealthy those backyard vegetables probably were. Why? Lead may lurk in backyard gardens unless you grow them in a raised bed:

As backyard vegetable gardens undergo a renaissance, environmental officials and scientists are warning homeowners to be careful before planting the carrots and chard: There might be lead in the soil.

Flakes of lead paint from old homes often create a halo of contamination around houses that vegetables can take up. Remnants of leaded gasoline might also be in the soil, especially near busy roads. While the problem is pervasive in urban areas, suburban homes that were built on or near apple orchards are also at risk because lead arsenate was once used regularly as a pesticide. The heavy metal can remain in soil for hundreds of years.

So when I saw the news footage of Michelle Obama breaking ground on the organic vegetable garden at the White House, they showed her tilling the soil as if she planned to just scatter some seeds right there on the ground. Of course, it was just a photo opportunity and the project is to raise awareness about healthful, locally grown fruit and vegetables. And yes, to avoid contamination, they will be grown in raised beds:

The plots will be in raised beds fertilized with White House compost, crab meal from the Chesapeake Bay, lime and green sand. Ladybugs and praying mantises will help control harmful bugs.

The White House was quick to outline the costs:

The total cost of seeds, mulch and so forth is $200, said Sam Kass, an assistant White House chef, who prepared healthful meals for the Obama family in Chicago and is an advocate of local food. Mr. Kass will oversee the garden.

What they didn’t include were the costs to build the raised beds and based on the published garden plans (above), this will likely approach several thousand dollars. It ain’t cheap to grow your own! Unless of course, you do it the way my mom did, without any fear of exposing the children to toxins that might cause learning disabilities and behavioral problems. Thirty years later, all is forgiven. After all, it was the seventies and back then, we were even allowed to bury our pets in the backyard.

But today, we know better and that knowledge will cost you. A typical backyard bed will set you back over $2,000 to have it built by a professional. Of course, you can trim these costs to $500 if you do it yourself. I even found one version where the cedar estimates were around $90. This same blogger also followed up with a Part 2 about how to fill the raised vegetable garden bed.

This project is actually on Jeanine’s list of goals for 2009. What we’re trying to decide is if we want to save money and do it ourselves or hire it out to a professional. Here is one service in San Diego County that we are considering.

I recently learned from my ex (Partner #2) that her sister, a landscape designer by trade, now builds backyard beds in Los Angeles. A few celebrities have even hired her to provide the weekly gardening services. I guess the B-list wants their organic veggies in reach, but they don’t want to do the weeding and watering. Only in LA! And of course, coming to you now in Washington, D.C.

For additional reading: Be sure and catch Serena’s gardening posts (Part 1 & Part 2) in her Stretch Your Food Dollar series and James’ posts on container gardening and urban (indoor) composting (Part 1 & Part 2).

In the meantime, has anyone done the math on growing your own? How long will it take to get a return on investment? Please share your stories below about savings gained through backyard gardens.

Image credit: The White House via The New York Times.