Plant Estimate Chart provided by Proven Winners
Example: If you select 18" spacing and need to cover 300 square feet, the box where that column and row intersect tells you that you need 132 plants.
If you don't see your exact coverage area listed, either estimate by selecting the closest area listed or use the second chart (Space Multipliers) to precisely calculate how many plants you need.

This chart is meant to be used as a guideline, site variables may affect exact quantities needed.