How Many Plants Will Fill an Area?
For plants spaced on center
| If you plant 100 plants at this spacing… | …they will fill an area this large… | …and the area will be this size if it is square. |
|---|---|---|
| 9” on center | 46 sq. ft. | 6.75 x 6.75 |
| 12” on center | 81 sq. ft. | 9 x 9 |
| 18” on center | 182 sq. ft. | 13.5 x 13.5 |
| 24” on center | 324 sq. ft. | 18 x 18 |
| 30” on center | 506 sq. ft. | 22.5 x 22.5 |
| 36” on center | 729 sq. ft. | 27 x 27 |
| 42” on center | 991 sq. ft. | 31.5 x 31.5 |
| 48” on center | 1,296 sq. ft. | 36 x 36 |
| 54” on center | 1,640 sq. ft. | 40.5 x 40.5 |
| 60” on center | 2,024 sq. ft. | 45 x 45 |
| 66” on center | 2,916 sq. ft. | 54 x 54 |
| 72” on center | 3,964 sq. ft. | 63 x 63 |
For plants spaced on a grid
| If you space plants this far apart on a grid… | …you’ll need this many plants to fill 100 sq. ft. |
|---|---|
| 4 inches | 900 |
| 6 inches | 400 |
| 8 inches | 225 |
| 9 inches | 178 |
| 10 inches | 144 |
| 12 inches | 100 |
| 16 inches | 56 |
| 18 inches | 45 |
| 24 inches | 25 |
| 30 inches | 16 |
| 36 inches | 11.11 |
From the GardenPro Answer Book; revised and updated by Lois Berg Stack, Ornamental Horticulture Specialist, University of Maine Cooperative Extension.
