Plant Spacing Calculator
Calculate how many plants fit in a garden bed using square grid or triangular offset planting patterns.
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How to use this calculator
The square grid places plants in rows and columns. Triangular offset planting staggers alternate rows by half a spacing interval, fitting approximately 15% more plants in the same area.
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Enter the length and width of your garden bed in metres.
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Enter the recommended spacing for your plant species in centimetres.
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Choose between square grid or triangular offset patterns.
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Optionally enter plant cost to get a total purchase estimate.
Frequently asked questions
When should I use triangular offset planting?
Triangular offset (also called diamond or staggered) planting is best when you want maximum ground coverage and weed suppression. It fits about 15% more plants and creates a more natural, lush appearance. It is ideal for groundcovers, low perennials, and mass plantings.
How do I find the correct spacing for my plants?
Check the plant tag or seed packet. Spacing is usually given as the mature spread of the plant. Planting too close causes competition for water and nutrients; too far apart leaves bare soil for weeds.
Does plant spacing affect bloom time?
Spacing affects airflow, which reduces fungal disease. Well-spaced plants often bloom better and longer because they are not competing for resources. However, plants in cold climates may benefit from closer spacing for warmth and wind protection.
Plant Spacing Calculator — Square Grid & Triangular Offset
Square Grid vs Triangular Offset Planting
A square grid places plants at equal intervals in rows and columns — easy to lay out and water. Triangular offset staggers alternate rows so each plant sits in the gap of the row before it, packing about 15% more plants into the same space and creating a fuller look faster.
Choosing the Right Plant Spacing
Always base spacing on the mature size of the plant, not its size when purchased. Fast-spreading groundcovers like ajuga can be planted 20–25 cm apart; shrubs may need 60–90 cm. Getting spacing right prevents overcrowding and reduces maintenance.
Calculating Cost Before You Buy
Enter the price per plant to get a total purchase estimate. Compare this with the number of plants required at different spacing intervals — wider spacing saves money upfront but the bed may look sparse for the first season.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →