4 celery plants fit per square foot on my chart, 6 inches apart. The Plan My Garden planner uses 2 per square instead, on the diagonal, for a full head with real stalk width.

2 dill plants per square foot, set diagonally about 6 inches apart, is the default for standard dill on my chart and the Plan My Garden planner. A dense leaf patch or compact Fernleaf can go at 4 per square, while a tall plant left to flower for seed needs a whole square to itself.

4 kohlrabi plants per square foot, about 6 inches apart, for standard bulbs. Crowd them to 9 per square for smaller bulbs, or give a giant storage variety a full 2×2 foot block instead.

4 bok choy plants per square foot, 6 inches apart, is the Plan My Garden planner’s spacing, matched by NC State Extension. Grown for a baby harvest, the chart packs 9 per square instead, and a full-size head needs 12 to 18 inches.

One cauliflower plant per square foot, 12 inches apart, the chart and planner spacing. University extension guides space it wider, up to 24 inches, so a full square is tight at the wide end.

4 parsley plants per square foot, 6 inches apart, whether you grow curly or Italian flat-leaf. Parsley germinates slowly, so the chart, the size difference between types, and the biennial second year all matter more than usual.