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

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From the GardenPro Answer Book; revised and updated by Lois Berg Stack, Ornamental Horticulture Specialist, University of Maine Cooperative Extension.