# Plant Spacing Calculator

Calculate how many plants fit in your garden bed. Enter dimensions and spacing to get plant count, row layout, and density for grid or triangular patterns.

## What this calculates

Figure out exactly how many plants to buy for your garden bed or landscape project. Enter your bed dimensions and plant spacing, and the calculator shows you how many plants per row, how many rows fit, and the total count. Works for vegetables, flowers, ground cover, and shrubs.

## Inputs

- **Bed Length** (feet) — min 0
- **Bed Width** (feet) — min 0
- **Plant Spacing** (inches) — min 1 — Distance between plant centers (on-center spacing)
- **Planting Pattern** — options: Grid (square), Triangular (offset rows) — Triangular spacing fits about 15% more plants in the same area
- **Edge Buffer** (inches) — min 0 — Distance from the edge of the bed to the first plant

## Outputs

- **Bed Area**
- **Plants Per Row**
- **Number of Rows**
- **Total Plants Needed**
- **Planting Density**
- **Spacing**

## Details

Grid vs. triangular spacing:

  - Grid (square) -- plants lined up in straight rows and columns. Easier to maintain and weed. Best for vegetable gardens.

  - Triangular (offset) -- every other row is shifted by half the spacing. Fits about 15% more plants in the same area. Creates a fuller, more natural look. Common for ground cover, flower beds, and ornamental plantings.

Common plant spacing guide:

  - Lettuce, spinach: 6-8 inches

  - Peppers, herbs: 12-18 inches

  - Tomatoes, squash: 24-36 inches

  - Annual flowers (petunias, marigolds): 8-12 inches

  - Perennial flowers (daylilies, hostas): 12-24 inches

  - Ground cover: 6-12 inches

  - Small shrubs: 36-48 inches

Edge buffer tip: Leave at least half the plant spacing between the edge of the bed and the first plant. This gives the outer plants enough room to grow without hanging over the border.

## Frequently Asked Questions

**Q: Should I use grid or triangular spacing?**

A: Grid spacing is easier to set up and maintain, making it ideal for vegetable gardens where you need to walk between rows. Triangular spacing fits more plants per area and looks more natural, making it the better choice for flower beds, ground cover, and ornamental plantings.

**Q: How do I measure on-center spacing?**

A: On-center (O.C.) spacing is measured from the center of one plant to the center of the next, not from the edges. If a tag says 12 inches on-center, dig your planting holes 12 inches apart, measuring from hole center to hole center.

**Q: Should I buy extra plants?**

A: Yes, buy about 5-10% more plants than the calculator shows. Some plants may not survive transplanting, and you may want extras to fill gaps or replace any that fail to establish. For ground cover projects, 10% extra is a good safety margin.

**Q: What happens if I space plants too close together?**

A: Overcrowding causes plants to compete for sunlight, water, and nutrients. This leads to leggy growth, poor air circulation (which invites disease), smaller blooms or fruit, and more maintenance. Follow the spacing recommended on the plant tag for best results.

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Source: https://vastcalc.com/calculators/everyday/plant-spacing
Category: Everyday Life
Last updated: 2026-04-08