My square foot gardening chart puts 4 thyme plants per square foot, 6 inches apart, but the Plan My Garden planner gives thyme the whole square, 1 plant, 12 inches apart. Both are right: 4 starts fill a square fast, 1 plant spreads to fill it over a couple of growing seasons.

1 oregano plant per square foot, 12 inches apart, but it is a perennial that spreads to fill the square on its own over a couple of years rather than a fresh planting every spring. Cutting back before it flowers, dividing it when it goes woody, and a square that stays full through winter all matter more than usual.

4 chive plants per square foot, 6 inches apart, but as a perennial clump those are 4 starter clumps, not a fresh planting. Dividing every few years, a square that stays full all winter, cutting leaves back to regrow, and the edible flowers all matter more than usual.

One watermelon plant per 4 square feet, a 2 x 2 foot block with plants 24 inches apart. The vine needs far more room than a pumpkin or cantaloupe, so plan on open ground, not more blocks.

One butternut squash plant per 4 square feet, a 2 x 2 foot block with plants 24 inches apart. The vine still needs a way out, and unlike a big pumpkin, butternut fruit is light enough to actually trellis.

One Brussels sprouts plant per square foot, 12 inches apart, the chart and planner spacing. University extension guides space it wider, up to 24 or 36 inches, so a full square is the tight floor, not a target.