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Plant Calculator

How Many Plants Do You Need?

 

On Center Spacing of Plants

8"

10"

12"

15"

18"

24"

Coverage Area in Square Feet

25

57

36

25

16

11

6

50

114

72

50

32

22

12

75

171

108

75

48

33

18

100

228

144

100

64

44

24

150

342

216

150

96

66

36

200

456

288

200

128

88

48

Spacing Multiplier

2.28

1.44

1.0

0.64

0.44

0.25

For other size areas, use the following formula to calculate how many plants you will need:

(Area in sq. feet) x (Spacing Multiplier) = Number of plants needed 
(Area is 2 feet by 25 feet = 50 sq. feet) x (Spacing 12 inches apart Spacing Multiplier is 1.0 ) = 50 is the number of plants needed 

Finding Unknown Spacing Multiplier

 

For other spacing requirements, use the following formula to figure your multiplier:

Multiplier = 144/X2 where X = the spacing distance in inches you need

Example: If you need a spacing of 13.5 inches, your multiplier would be:

144

=

144

=

0.79

13.52
 

182.25

 

multiple

planting-patterns.jpg

The above chart and formula are based on planting in a grid pattern. If you are planting in a staggered or equilateral triangular pattern (which gives a more massed effect) the rows will be a little closer together and more plants will be needed.
An additional 15% will be required and the row spacing would be reduce by a factor of 0.866 (the sine of 60 degrees) for the equilateral triangular layout. 
For example - based on 100 square feet and a spacing of 12 inches, 100 plants are needed. In a trianglar pattern 15 more plants would be needed (100 x 15% = 15). Instead of 12 inch rows, rows would be 10.4 inches apart (12 x .866 = 10.392).

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