15cm should be fine
You should plant it 15 inches apart.
You should plant them arond 3-4m apart
You should plant them 3 inches apart.
20ft apart
because it does
plant them 12 to 15 inches wide. Keep rows 3 to 4 feet apart.
10 cm
200 meters
two inches apart
10 or 12 inchs
3 feet
6x4 meters