15 Common Square-Foot Gardening Mistakes to Avoid (2024)

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Square foot gardening is one of the most beginner-friendly gardening methods going. The genius behind it is that it makes the entire gardening process approachable.

No matter what stage you’re at in the growing season — planning, weeding, watering, or harvesting, you’re only dealing with one, 1’x1’ square at a time.

The pioneer of this method, Mel Bartholomew, started gardening when he retired as a construction engineer. And if you know any engineers, then you know they can never leave well-enough alone.

Lucky for us, Mel didn’t either, and the square-foot method was born out of his frustration with conventional row gardening.

But like learning anything new, it’s easy to make mistakes.

Don’t let that discourage you from getting started, though, because mistakes are a great way to learn. Even better if you can learn from someone else’s mistakes, which is what this post is all about.

I’ve rounded up the most common square-foot gardening mistakes, so you, the new square-foot gardener, can avoid them. Some of these I’ve even made myself; repeatedly. You know, just to help you out.

Along with this list, I highly suggest picking up a copy of the All-New Square Foot Gardening, 3rd Edition, Fully Updated, by Mel Bartholomew, so that you can get growing with the master himself.

Another super-handy tool (although not necessary) is this 1’x1’ planting grid. It makes direct-sowing seeds a breeze.

For a quick-start guide, you can also use my article

.

Okie-Dokie, let’s get to the mistakes!

1. You Have to Build Raised Beds

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This is the number one mistake I see gardeners make with square-foot-gardening. For many, square-foot gardening goes hand-in-hand with raised beds. Having your garden contained within walls definitely helps, but it’s in no way necessary.

You don’t have to use raised beds to use the square-foot gardening method. You can just as easily map out grids on your existing garden or even go no-dig.

Cheryl walks you through getting started and common mistakes:

6 Reasons To Start A No Dig Garden + How To Get Started

12 Common Mistakes That No-Dig Gardeners Make

2. Don’t Try to Eyeball It

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You know the old saying, “Close only counts in horseshoes and hand grenades.” It’s true when it comes to square-foot gardening too. Because some of the vegetables you’ll be growing can have as many as sixteen plants in a square foot, it’s important to make sure you have that full square foot to work with.

Use heavy-duty twine or cotton string (that will last for the entire growing season) and mark out your grid of squares, keeping your string as close to the ground as possible.

Check your measurements every few feet, too, to make sure you’re staying consistent. There’s nothing more frustrating than knowing you have a 4’x8’ bed, but suddenly you only have enough room lengthwise for seven squares because your 1-foot lines started getting a bit roomy.

3. Honey, Are These Beets or Radishes?

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When they first pop up out of the soil, nearly all seedlings look the same. Good luck trying to remember what they are when you walk out to your garden and are met with a grid of tiny green leaves.

Before you even put a single seed in the dirt, grab yourself some wrapping paper with those handy cutting lines on the back and plan out your garden first. Most importantly, if you changed anything when you planted seeds, note it on your garden plan.

4. I Know We Had Paths Back in the Spring

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Tiny paths are a big problem, and it’s a very common mistake when establishing your square-foot garden.

It’s best to make your pathways bigger than you think they will need to be. I recommend 4’ pathways. I know that sounds like a lot, but when you’re trying to maneuver a wheelbarrow, kneel to pick beans, or your cabbages have matured and are now growing into your tiny path, you’ll thank me.

And in the end, if you decide four feet is too big, it’s much easier to make your paths smaller next year than rearranging an established garden to make paths bigger. Ask me how I know.

5. Here a Square, There a Square, Everywhere a Square

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Yup, it’s the square-foot-gardening method, but that doesn’t mean you have to plant everything in large square blocks. In fact, you may end up shading out other veggies if you do. Take tomatoes as an example. If you plant all of your tomatoes in the center squares of your garden, you could end up shading out vegetables on either side of them.

Just because you’re planting in 1’x1’ squares doesn’t mean you need to plant all of your green beans in four of those squares blocked together. Plant them in a row of four squares, or alternate squares with another vegetable – beans then carrots, then beans, then carrots. This is important when you’re making use of companion plants.

6. Don’t Forget the Flowers

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Speaking of companion plants, many new square-foot gardeners have nothing but veggies on the brain, and they forget to add flowers to their gardens.

Flowers will attract pollinators, and some flowers are companion plants too. Other flowers with a strong scent can help to keep deer and other furry creatures from nibbling your veggies.

11 Ways To Keep Deer Out Of Your Garden (+ Dad’s Foolproof Solution)

Make room for a square or two of marigolds, zinnias and other blooms.

Related Reading: 12 Best Flowers To Grow In The Vegetable Garden

7. Keep It Close to Home

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A garden you can’t see is a garden you neglect. The closer to the house you can put your garden, the better. Not only does it make chores much easier, but it also makes keeping an eye on things easy as well.

You’ll be more likely to notice problems sooner if you can glance at your garden from your window. Pests, diseases, watering needs are all easy to catch if you’re regularly seeing your garden so that you can take action right away.

8. My Carrots Hit a Dead End

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If you’re planting root crops, don’t forget it’s not just about how close they are to one another, especially where carrots are concerned. Make sure you have enough room going down as well as around. This is especially important if you are using a close-bottomed container for growing.

9. Where Did That Shade Come From?

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When planning your beds, it’s best to set them up to face north to south rather than east to west. This will allow all of your plants to get plenty of bright sun during the day.

Pay attention to nearby trees and buildings and where they cast shadows. It’s also important to keep in mind that the sun’s path will change over the growing season.

10. They Looked Much Smaller In the Seed Catalog

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Sure, those tomato plants look pretty tiny sitting there next to your eggplant now, but come July, you may be wondering where your eggplant went. Pay careful attention to the mature size of everything you plant when planning what you’ll grow around it.

I’ve said it before, and I’ll say it again, tomatoes are always bigger than you expect them to be.

11. Is That the Path Or a Jungle?

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When planning out and establishing a new square-foot garden, it’s easy to get completely focused on what you’re growing inside it. However, you’ll soon realize you should have taken the time to plan what would grow outside of it as well, or you’ll be fighting back your yard. Grass and weeds can easily encroach on beds, and if they aren’t raised beds, take over your well-planned garden.

Plan on mulching or adding some sort of weed barrier to your paths. A great way to keep weeds down is to put cardboard down on your paths, give it a good soaking with the hose and then mulch heavily.

12. My Gloves Are 4’ Away, But I Can’t Get to Them

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I’m sure I’ll get a lot of flack for this, and I’ve been known not to take my own advice, but I always regret it. If you’re going to use the square-foot method, use 4’x4’ square beds instead of long, rectangular rows. What do I mean by this? Make your beds 4’x4’ instead of a 4’x8’ or longer.

One of the main concepts behind square-foot gardening is your ability to reach every part of the bed no matter what side of it you’re on. The minute you start going lengthwise, you will need to walk around to the other side to do certain things. Like when you realize you left your gloves on the other side of the bed, and you’re smack in the middle of your 16’ long row.

While this doesn’t sound like a big deal, all that extra walking to take care of this, that, and the other thing adds up. Before you know it, you’ll be sweating more than you’ll be growing.

P.S. Don’t try and jump the four feet to get to your gloves. You’ll end up with a squashed pepper plant and a bruised ankle. Ask me how I, you know what, don’t ask.

13. Didn’t We Just Weed/Water This?

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Don’t forget to mulch. Seriously, this is one of the best things you can do for your established plants. Mulching locks in moisture and keeps weeds at a minimum, which means less time doing chores. It’s an important step in square-foot gardening.

14. Why Is There an Empty Square?

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Empty squares can mean soil erosion, especially if you didn’t mulch. Most of us try square-foot gardening for the space-saving aspect, so get the most out of that space throughout the growing season.

If a plant is done, pull it up, replenish your soil with a little compost and plant something else. Radishes are the square-foot gardener’s friend because they grow super quick, and you can get sixteen of them from one square foot.

15. I Don’t Know, Maybe Next Year

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Square-foot gardening is easy, but too many would-be-gardeners never get started because they’re scared of failing. I want to let you in on a little secret – every single gardener out there is a big failure. Every year, something goes wrong for each of us. Often, many things go wrong.

No matter how many decades of soil we have under our nails or how many successful gardens we plant, there is always something that doesn’t go according to plan. It’s part of gardening; it’s how we learn and get better each year.

And it also gives us something to talk about with other gardeners.

“Hoo-boy, have you seen the size of the tomato hornworms this year?”

“If this rain doesn’t stop, my poor garden is going to drown.”

Please, just get started.

Even if your first year turns out to be a disaster, I guarantee you’ll be pulling up your plants in the fall already mentally planning everything you’ll do differently the next year. And there will be a next year because the gardening bug will have bitten you.

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15 Common Square-Foot Gardening Mistakes to Avoid (2024)

FAQs

What is one of the biggest disadvantages to square foot gardening? ›

Drawbacks of Square Foot Gardening

Some crops, like large, indeterminate tomatoes, need more space than a single square foot—otherwise they'll start stealing nutrients and water from other plants. Plus, plants can deplete moisture and nutrients quickly in a square foot garden due to the intensive planting technique.

How far apart do you plant cucumbers in a square foot garden? ›

You can comfortably grow two cucumber plants, spaced 6 inches apart, within a square foot. You may think that's not much, but take into consideration that cucumber plants are vigorous vines that can produce approximately five pounds of fruit per plant.

Does square foot gardening really work? ›

Popularized by retired engineer-efficiency expert Mel Bartholomew, square-foot gardening allows you to get a high yield from a small area—a win-win situation for beginning and experienced gardeners. It's especially beneficial to gardeners who don't have much time or yard space.

How many square feet of garden to feed one person? ›

Traditional gardens, most people seem to agree that for a conventional row garden (a row of corn, a row of lettuce, a row of tomatoes…) 100 square feet per person is needed for a fresh eating garden, and about 200 square feet per person if you want to can food for year round use.

What is the most efficient garden layout? ›

Square foot gardening is an efficient and space-saving technique that involves dividing your garden into small, manageable squares. Each square is typically one foot by one foot and is planted with a specific number of plants depending on their size.

How many tomatoes can you plant in a square foot? ›

SFG recommends planting one indeterminate tomato per square in the grid. We're assuming you're attaching your trellis to the north end of your raised bed and that the tomato is planted in those adjacent squares.

Can you plant cucumbers and tomatoes in the same area? ›

Cucumbers and tomatoes can be planted by each other as they share similar growing habits and therefore you can grow tomatoes by cucumbers. Greg Volente from Greenhouse Today explains that: 'Cucumbers and tomatoes are two vigorous growers in a spring garden. They're both vining plants and share similar basic needs.

How many marigolds per square foot? ›

Marigold seeds are planted 1/2 inch deep, 4 per square foot, in the full sun. Take care to notice what plants are around the area as well, see the companion plant section below. Your seeds should sprout within 14-21 days. You will need to provide your marigolds with consistent moisture.

Are used coffee grounds good for tomato plants? ›

Coffee grounds contain around 2% nitrogen as well as varying amounts of phosphorus and potassium which are all very important for the growth of tomato plants. By mixing some coffee grounds into the soil below your tomato plants you're introducing these nutrients that the plants need to thrive.

Should I fertilize my square foot garden? ›

Extra fertilizer might be needed to get the best harvest

Plants need sufficient nutrients for growth, and vegetables are no exception. The SFG method recommends a strict recipe of compost, peat moss, and coarse vermiculite—and claims that's all that is needed—to fill your planting beds.

What vegetables are worth growing? ›

10 Vegetables That Provide the Best Payback
  • Tomatoes. These aren't the easiest to grow, but if you can nurse tomato plants through issues such as blight, septoria leaf spot, and groundhog attacks, the payoff is huge. ...
  • Peppers. ...
  • Cucumbers. ...
  • Asparagus. ...
  • Onions, Leeks, Shallots, Garlic. ...
  • Lettuce. ...
  • Squash. ...
  • Rhubarb.

Is there an app for square foot gardening layout? ›

Garden Manager is a web app that allows you to visually create your beds, then say what you want to plant per square foot. Based on your information that you give it about the amount of sunlight the bed gets, and how deep your soil is, and your planting zone, it will help you choose the best vegetables to plant.

How big of a garden do you need to be self-sufficient? ›

The general rule of thumb when it comes to growing a garden is to have 100 square feet of gardening space (traditional row gardens) per person for fresh eating only. To preserve food and put it up for the non-growing season, you're looking at 200 square feet of gardening space per person.

What is one of the advantages of square foot gardening? ›

One of the most significant advantages of square-foot gardening is that it saves or consumes 80% less space than conventional gardening. Gardeners can plant various crops in a small area by using a raised bed and dividing it into one-foot squares.

Why are larger homes worth less per square foot? ›

Additionally, the cost of modernizing finishes, fixtures, and appliances in a larger space adds up quickly. Buyers considering these properties are likely to factor in these potential renovation costs, which will usually lead them to offer a lower price per square foot compared to smaller, more recently updated homes.

Is square foot gardening still popular? ›

Using many of the same concepts of intensive gardening, SFG encourages people to build a square garden bed and, using a grid, divide it into 1-foot squares that are each planted with a different type of veggie. The method quickly became—and still is—hugely popular.

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