The Pros and Cons of Square Foot Gardening

square foot garden planner, square foot gardening soil, square foot gardeningRetired engineer-turned-gardener Mel Bartholomew’s “Square Foot Gardening” consistently tops the list of best-selling gardening books – and there’s a reason. Square foot gardening promises little or no weeding, consistent results, and lots of organic veggies from a tiny space. Does it work? Yes. But is it a good method for you? That deserves a deeper look.

What Is A Square Foot Garden?

Square foot gardening differs from most other gardening systems in that you don’t use your native earth. Instead, you use a perfect mix (Mel’s Mix) of “soil” created from one part compost, one part vermiculite, and one part peat moss.

The classic Square Foot bed is a 4’ x 4’ square constructed of anything from lumber to bricks to cinder blocks. Bartholomew also strongly recommends putting a permanent grid over the top dividing the bed into easily manageable 1’ squares. This is useful for crop rotation, replanting, seeding and spacing. This grid can be made of stretched string, PVC, 1 x 2 lumber or whatever you have lying around. Having a visual delineation of your plants is definitely helpful, but this part of the Square Foot Garden design is where gardeners often diverge from the plans in Bartholomew’s book.

An “official” square foot garden bed isn’t in contact with your native soil at all. Provided the box is 6” deep and contains “Mel’s Mix,” it will still produce well. The only fertilizer Bartholomew recommends is compost. Keep producing that, and your gardens will keep growing for you.

That’s square foot gardening in a nutshell. It’s a remarkably well-engineered, self-contained way to garden.

Benefits of Square Foot Gardening

“Mel’s Mix” is a spongy, airy, rich medium for your plants. It’s also weed-free, unless you start with homemade compost that wasn’t “cooked” enough in a hot compost pile. (NOTE: even if you do think the pile got hot enough… watch out… lots of seeds usually manage to slip through the cracks.) You don’t have to deal with ph problems, nematodes, rocks, etc. It’s like… science gardening. Having a clean slate is great.

Another place where square foot gardening shines is in its ability to produce high amounts of veggies in a small space. If you want to grow beans, cabbages, salad greens, peppers, onions and other smaller plants, square foot beds are very convenient and supportive. Bartholomew also has plans for melon and bean trellises so you can grow vertically and get more use from the space.

Unlike some methods, square foot gardening as Bartholomew recommends it is a completely organic system. As you pull out spent crops, put in a handful of compost in the holes left behind and then plant again. This means you do not have to bring in anything new after the initial purchases of peat and vermiculite. All your “fertilizer” is produced by you.

Another cool thing? With a square foot garden, you can drop a garden right over grass or weeds without even pulling stuff up. Boom! Instant space. The book recommends putting a barrier down at the bottom of the newly constructed bed. Weed block and cardboard both work. Or you can build the bed on top of concrete, believe it or not.

One final place where this method really shines is its appeal to new gardeners. The system is simple enough for anyone to create and it produces consistently. Mel Bartholomew is really fun to read – the book is worth buying just to hear what a truly excited and enthusiastic gardener sounds like. For a person just getting started, he takes the overwhelming world of food production and cuts it into nice, neat 12” x 12” pieces that are easy enough for even a complete novice to digest. When my wife wanted to start gardening, I set her up with square foot beds. My food forests, seed saving and seed slinging, green manuring, and intercropping were beyond her, but a 4’ x 4’ box of veggies was a good gateway to introduce her to home food production.

square foot garden planner, square foot gardening soil, square foot gardening

A roughly 4′ x 16′ square foot garden in the author’s backyard.

Drawbacks of Square Foot Gardening

Now let’s look at the other side of the coin. If square foot gardening were the end-all system, it would be recommended across the gardening community, right? Yet writers like Steve Solomon, Ruth Stout, John Jeavons, Toby Hemenway, Carol Deppe, Edward Smith, Dick Raymond and others have different methods that work for them. Square foot gardening, despite its advantages, also has some drawbacks.

A main drawback of this system is the initial setup cost. You have to build beds from something and then fill them with perfect soil. Though Bartholomew is using the system for international relief efforts by growing with compost alone, rather than his three-part mix, even compost takes work to make, or money, if you buy it. Getting a proper square foot garden together cost me about $60.00 to build and fill. That’s for a 4’ x 4’ growing space. Double-digging could create the same space for $0.00, provided you had a little compost or manure lying around. If you wanted to feed your entire family with square foot beds, you’d be out some serious cash. Granted, you’d earn it back in home-grown organic produce over time – which is why I bit the bullet and built beds for my wife – but it’s still a big outlay. And the building of beds and mixing of “soil” takes some time.

I also found that the 6” deep thing didn’t work out very well here in Florida. The soil tended to dry out faster than I expected and stress my plants out. The standard square foot bed also doesn’t allow you to grow much in the way of large root crops or crawlers like melons. I eventually took the bottoms out of mine once I was sure the weeds beneath were dead.

This system requires more watering than systems that employ wider spacing. It may be perfect for a townhome’s backyard… and gardener that likes watering regularly… but it’s less attractive when you have a lot of land available. You might not have weeds to pull – but you’ll be spending some time watering during the summer. You can’t let a couple of days slip or you’ll be having a square foot funeral.

To SFG Or Not To SFG

Even though I don’t follow most of his advice, I’m a fan of Mel Bartholomew. He’s gotten people gardening and helped feed people around the world. He’s encouraging, uplifting, thoughtful and a fun writer. He’s an organic gardener and a philanthropist, and just seems to be an all-around sharp guy with a good heart. If you’ve got a limited amount of space, like well-planned systems, and you’ve got some resources, square foot gardening is a great method.

That said, it’s not where most of the food comes from on my homestead. I use a combination of methods ranging from row gardening to biointensive beds to water gardening to permaculture, etc. Square foot gardening is in my arsenal – but it doesn’t play a major role in my garden plans. In fact, I’m now digging beneath my old square foot beds and stacking in wood as water reservoirs in a hugelkultur-inspired fashion… but that’s another story altogether.

If you’re not gardening now, you need to start. And if it takes a 4’ x 4’ box with good instructions and a smiling mentor; sure, you can start with square foot gardening. But if you’re anything like me, you’ll eventually outgrow the box and concentrate on building your own soil rather than bringing it in from outside.

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About David The Good

David The Good is a naturalist, author and hard-core gardener who has grown his own food since 1984. At age five, he sprouted a bean in a Dixie cup of soil and caught the gardening bug. Soon after, his dad built an 8’ by 8’ plot for him and David hasn’t stopped growing since. David is the author of four books, writes a regular column for The Ag Mag in North Central Florida, is a Mother Earth News blogger and has also written for outlets including Backwoods Home, Survival Blog and Self-Reliance Magazine. You can find his books on Amazon here. David is a Christian, an artist, a husband, a father of seven, a cigar-smoker and an unrepentant economics junkie who now lives somewhere near the equator on a productive cocoa farm. Visit his daily gardening and survival blog here: The Survival Gardener And for lots more gardening info, click here and subscribe to his often hilarious YouTube channel.

View all posts by David The Good

4 Responses to “The Pros and Cons of Square Foot Gardening”

  1. Lisa Lynn Says:

    I’ve read his books too and enjoyed them. I think that the sfg system is great for people who really like an organized space. I’m just not that organized…there, I said it. It’s also great for small spaces, folks who don’t have a lot of time or energy, and I think people with a handicap would find his table beds very helpful.

    I’m more like you…I like a variety of different methods and I’m not afraid to mix ’em up. :) Thanks for sharing your thoughts.

    Reply

  2. Kaycee Says:

    I’m starting a garden on an abandoned cement pad in our backyard (it’s the only place with consistent sun) and I am torn between the DIY Earthbox system and the SFG system. Have you heard of anyone having success merging these two? I was considering building a SFG with a self-watering/wicking system built underneath.

    Reply

    • David Goodman Says:

      My advice: experiment! Try a straight earth box, a square foot garden, and a merged version. Then you’ll know which is the best for your situation… and can build from there.

      Reply

  3. Alex Hochberger Says:

    I picked up his book after consistently failing to get a garden going. I dropped a few hundred bucks on 6′ x 4′ raised beds and was out with the kids harvesting.

    Since then the wood rotted, Florida’s climate is brutal (going into full sun in the summer to rip out the out of control tropical weeds), but guess what, I’m still gardening.

    I think it’s the perfect introduction for urban gardening. For my larger suburban garden, it’s still a perfect way to get a LOT of food/vegetables growing in the side of my yard dedicated to vegetable gardening.

    I got rid of the boxes this season and using berms, because otherwise I’d be missing this entire season. I may build new boxes this spring, or we’ll see how the berms where the boxes used to be works.

    But like you, I 100% recommend it as a “here is a way for a homeowner or renter to grow some vegetables at home.”

    Hit witticisms are correct though, a suburbanite or urbanite gardening need not borrow techniques from large scale farms, the more intense, lower weed situation makes it perfect,

    Reply

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