Garden Plant Spacing Guide
Determining the right number of plants for your garden bed ensures complete coverage without overcrowding. The number depends on the bed dimensions, the spacing recommended for each plant species, and the planting pattern you choose.
Most perennials, annuals, and ground covers come with a recommended spacing on their plant tag. This spacing represents the mature spread of the plant, ensuring each plant has room to reach its full size.
Plant Count Formulas
Common Plant Spacing Guide
| Plant Type | Spacing (inches) | Plants per sq ft |
|---|---|---|
| Ground Cover (Ajuga, Creeping Thyme) | 6 - 8 | 2.3 - 4.0 |
| Small Perennials (Hosta, Daylily) | 12 - 18 | 0.4 - 1.0 |
| Medium Perennials (Coneflower, Salvia) | 18 - 24 | 0.25 - 0.4 |
| Large Perennials (Ornamental Grass) | 24 - 36 | 0.11 - 0.25 |
| Annuals (Petunias, Marigolds) | 8 - 12 | 1.0 - 2.3 |
| Small Shrubs | 24 - 48 | 0.06 - 0.25 |
Frequently Asked Questions
What is the difference between square and triangular spacing?
Square grid spacing places plants in straight rows and columns. Triangular (staggered) spacing offsets every other row by half, creating a more natural look and fitting about 15% more plants in the same area. Triangular spacing is preferred for ground covers and mass plantings.
How many extra plants should I buy?
Buy 5-10% extra plants to account for transplant losses, damaged plants, and gaps that need filling. If planting in poor soil or extreme conditions, increase to 15-20% extra.
How do I calculate for an irregular shaped bed?
Break the irregular shape into rectangles or triangles, calculate each section separately, and add them together. Alternatively, estimate the total square footage and use the plants-per-square-foot rate.