Plant spacing is measured center-to-center — from the center of one plant to the center of the next. This ensures each plant has equal access to nutrients, water, and sunlight. For example, if a seed packet says "space 18 inches apart," measure 18 inches from the center of the first planting hole to the center of the next. Our calculator uses this center-to-center method. The edge offset accounts for the space between the garden border and the first plant's center.

• Square Grid: Plants are spaced evenly in both directions, forming a square pattern. Best for raised beds, square foot gardening, and crops that need uniform spacing (like carrots, onions, or lettuce).
• Row Layout: Plants are closer together within rows, with wider spacing between rows for walking paths. Ideal for larger gardens where you need access for weeding, watering, and harvesting (tomatoes, beans, corn).
• Triangular (Staggered): Plants in alternating rows are offset by half a spacing unit, creating a honeycomb-like pattern. This packs plants ~15% more densely than square grid while maintaining the same center-to-center distance. Great for maximizing yield in limited space.

Edge offset is the distance from the garden border to the center of the first plant. A larger offset means plants start farther from the edge, reducing total plant count but preventing roots from competing with walls or pathways. The default offset (half the plant spacing) is a common gardening practice that balances space utilization with healthy root development. Setting it to zero maximizes plant count but may crowd plants at the edges.

Triangular (staggered) spacing arranges plants in a honeycomb pattern where each plant is equidistant from its six nearest neighbors. Compared to square grid at the same spacing, triangular layout fits approximately 15% more plants per unit area because it eliminates the unused corner space inherent in square arrangements. It's especially beneficial for leafy greens, strawberries, and ornamental bedding plants. The automatic row spacing (spacing × 0.866) is derived from the geometry of equilateral triangles.

Yes! Use the toggle at the top of the calculator to switch between Imperial (feet for garden dimensions, inches for spacing) and Metric (meters for garden dimensions, centimeters for spacing). All values are automatically converted when you switch units, and the plant count remains accurate. The visualization updates accordingly.