Square Foot Gardening Basics
By Growing Home Greens Team · July 16, 2026
Traditional row gardening (the kind laid out for a tractor and acres of open ground) wastes a lot of space in a backyard bed. Square foot gardening, developed by Mel Bartholomew, divides a bed into a grid of one-foot squares and assigns each square a plant count based on that plant’s actual size, not a one-size-fits-all row spacing. It’s the system behind our Garden Designer.
How many plants per square?
It depends entirely on the plant’s mature size:
- Big plants (1 per square): tomatoes, peppers, broccoli, cabbage
- Medium plants (4 per square): lettuce, basil, garlic
- Small plants (9 per square): bush beans, spinach, beets
- Tiny plants (16 per square): carrots, radishes
Vining crops like winter squash and pumpkins don’t fit the grid cleanly at all. They need multiple squares’ worth of room to sprawl, which is why our designer gives them a larger footprint and nudges them toward a bed edge instead of the middle.
Why this beats rows for a home garden
Tighter spacing means less exposed soil, which means fewer weeds get a foothold and the soil holds moisture longer between waterings. It also makes planning simple: a 4×4 bed is 16 squares, and you can count exactly how many plants of each type will fit before you buy a single seed packet.
Try it without any math
Open the Garden Designer, set your bed size, and place plants, the spacing, footprint, and companion-planting warnings are all handled automatically, and there’s a “plan it for me” mode that will lay the whole bed out for you if you’d rather just pick plants and quantities.
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews. See the sources cited on each item.
Pin this for later
Square Foot Gardening Basics: The spacing system behind our Garden Designer: why a grid of one-foot squares beats traditional rows for most home gardens.
Save to Pinterest