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How many flowers or plants do you need for your garden bed or space?
Avoid the nursery and find out that you bought too many flowers or plants—or, discover that your number fell short of the look you want in the garden space. We consulted the New York Botanical Garden in the Bronx. This is his formula for estimating the number of plants you need. Obviously, it depends on the type of plant but this gives you a good guidelines for garden design as a starting place.
Steps for Calculating the Number of Plants
1. Determine the number of square feet in the area to be planted:
Step 3. The suggested spacing for wax begonia (Begonia semperflorens-cultorum) is 8 to 10 inches.
At 8-inch centers, 8 inches x 8 inches = 64 square inches for each plant.
At 9-inch centers, 9 inches x 9 inches = 81 square inches for each plant.
At 10-inch centers, 10 inches x 10 inches = 100 square inches for each plant.
Note: The middle of the suggested range (9 inches) is usually recommended, but for quicker coverage, the low range (8 inches) can be used. The higher range (10 inches) is usually not recommended. If all plants do not grow, coverage will not be complete.
At 13-inch centers, 2,304 square inches ÷ 169 square inches = 13.6 or 14 plants.
At 14-inch centers, 2,304 square inches ÷ 196 square inches = 11.8 or 12 plants.At 15-inch centers, 2,304 square inches ÷ 225 square inches = 10.2 or 11 plants.
Note: If your calculations come out to a fraction of a plant, such as 40.4 or 80.7, always use the next whole number. It doesn’t sound like a big difference, but that one extra plant, not noticeable when first planted, may make the difference as to whether or not your design fills out.
If you are growing a vegetable garden, our online Garden Planner will automatically calculate the spacing by vegetable plant for you! Technology is indeed amazing. Explore the Almanac Garden Planner.