Planning a Square Foot Garden

How to Build a Square Foot Garden

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Square-foot gardening is a method of densely planting in squares for multiple harvests in a small space, even if you have poor soil.

The online Almanac Garden Planner makes it easy to create your square-foot garden with a special “SFG” mode to help you space your plants. Why not try it out the Garden Planner for free here: Almanac Garden Planner

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Planning Your Square Foot Garden

Square Foot Gardening (commonly referred to as SFG) is a planting method that was developed by American author and TV presenter Mel Bartholomew in the 1970’s. It’s a simple way to create easy-to-manage gardens with raised beds that need a minimum of time spent maintaining them. SFG rapidly gained popularity during the 1980’s through Mel’s first book and television series and since then has spread across the world, eventually going mainstream’ with several companies offering ready-to-assemble SFG gardens. SFG advocates claim it produces more, uses less soil and water and takes just 2% of the time spent on a traditional garden. So what makes Square Foot Gardening special and why don’t all gardeners use it?

SFG was developed as a reaction to the inefficiencies of traditional gardening. In 1975, Mel Bartholomew had just retired as an engineer and decided to take up gardening as a hobby. It was only natural that he would apply his analytical skills to the problems he encountered. In particular he found the average gardener was spending hours weeding the big gaps between long rows of plants, creating unnecessary work for themselves. It soon became clear that getting rid of rows and using intensive deep-beds could dramatically cut the amount of maintenance the garden required. Add a one-foot square grid on top and it became easy to space and rotate crops.

The Square Foot Gardening System

Over the years the SFG system has evolved into a precise set of rules:

  • Create Deep Raised Beds: Typically 4 feet by 4 feet, with a square foot lattice placed on top to visually separate the crops. Beds are between 6 and 12 inches deep which gives the plants plenty of rich nutrients, while maintaining good drainage.
  • Use a Specific Soil Mix: One third each of compost, peat moss and vermiculite. This starts the raised beds completely weed-free as well as being water retentive and full of nutrients.
  • Don’t Walk on the Soil: This is now common practice with raised bed gardening but back in the 1970’s it was revolutionary to suggest that you wouldn’t need to dig your soil if you didn’t tread on it.
  • Plant in Squares: To keep the planting simple there are no plant spacings to remember. Instead each square has either 1, 4, 9 or 16 plants in it depending on the size of the plant – easy to position in each square by making a smaller grid in the soil with your fingers. As an exception to this there are a few larger plants that span two squares. Climbing peas and beans are planted in two mini-rows of 4 per square.
  • Thin with Scissors: Instead of pulling up excess plants which can disturb the root systems of the plants you want to grow you snip them off with scissors.
  • Accessorize: As well as details of all the above the All New Square Foot Gardening book has practical instructions for constructing various accessories including protective cages that easily lift on and off the SFG beds, covers to extend the season and supports for vertical growing.

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There’s a purpose to each of these ‘rules’ and together they make up a powerful and almost fail-safe method for successful gardening. It’s a great method for new gardeners, people who have little time, the elderly or disabled (SFG gardens can be built at a raised height to make them more accessible) and children. Many schools have embraced the SFG method because it’s easy to install and maintain without becoming an additional burden for the teacher. However, there are some limitations:

  • Easy to Outgrow: Although many vegetables can be grown in SFG gardens it struggles to accommodate larger plants (squash, melons, main-crop potatoes etc), perennials (globe artichokes, rhubarb) and fruit bushes/trees. Once new gardeners experience the success of SFG gardens they often want to expand the range of crops they grow beyond the standard SFG crops.
  • Non-renewable Resources: There’s no doubt that ‘Mel’s Mix’ makes an excellent soil for vegetables . However, two of the three ingredients come from non-renewable sources. Peat takes thousands of years to develop and is a valuable natural sink for greenhouse gases. Vermiculite is mined and is therefore also a non-renewable resource with a significant carbon footprint. In common with many gardeners I won’t use peat and would prefer not to use vermiculite.
  • Expensive for Large Gardens: Although SFG beds are cheap to maintain they are quite expensive to set up if you have a large area and want to fill it quickly.

None of these reasons prevent SFG from being a useful part of a garden though. You can use 100% recycled compost in the beds instead of Mel’s Mix, gradually build up the number of SFG beds and combine it with areas of your garden which are set aside for fruit trees and larger crops. Many of the SFG techniques that were revolutionary in the 1980s are now commonly used for vegetable gardening: deep raised beds, not compacting soil, removable covers and plant supports, etc.

Planning a Square Foot Garden

The Almanac Garden Planner now offers a Square Foot Gardening mode that makes it easy to add one-foot squares of plants as well as using all the other powerful features of the software such as crop rotation, tracking varieties etc. Best of all is that the SFG plants can be part of a larger garden plan that includes more traditional planting layouts and large plants, so there’s the flexibility to combine different methods in a plan of a single garden area.

Square Foot Gardening was revolutionary when it was first invented and it’s still a great system for people who are starting out, have limited space or want a highly organized method to follow. However, you don’t need to follow SFG to benefit from gardening with raised beds and good organization. There’s a great quote: “If the only tool you have is a hammer, you tend to see every problem as a nail.” SFG works really well for many situations but it doesn’t fit everything. The success it brings can often lead people on to discovering the delights of fruit trees, using barrels to grow huge crops of potatoes or managing a greenhouse full of high-value crops. It’s a great stepping-stone to the world of growing your own food and that’s why 35 years on it’s still going strong.

Garden Planning Tool

If you need help designing your vegetable garden, try our Vegetable Garden Planner. We’re offering a free 7-day trial—ample time to play around and plan your first garden! We hope this software works for you.

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