Plant Spacing Calculator
Calculate how many plants you can fit in your greenhouse with optimal spacing
Calculator
Common Plant Spacings
Select a plant type to use recommended spacing
Pro Tips
- Consider walkways between rows (add 18-24")
- Account for plant growth - mature size matters
- Vertical growing can increase capacity by 2-3x
- Group plants with similar water/light needs
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Why Proper Plant Spacing Matters in a Greenhouse
Crowd plants too closely and you invite powdery mildew, poor airflow, nutrient competition and stunted harvests. Space them too far apart and you waste precious heated square footage. Our calculator removes the guesswork so you can dial in optimal greenhouse plant density for higher yields and healthier crops.
Whether you grow compact lettuce, vining cucumbers or tall indeterminate tomatoes, spacing influences everything from light penetration to pest management. Bookmark this tool and maximise every inch of your poly‑carbonate, glass or hoop‑house structure.
Frequently Asked Questions
How do I calculate plant spacing for raised beds in a greenhouse?
Measure the inside length and width of your raised bed, choose the recommended spacing for your crop—our preset list gives quick guidelines—then divide each dimension by that spacing. The calculator automates this for you and even flags spacing errors.
What’s the recommended spacing for tomatoes grown under cover?
Most greenhouse tomatoes thrive at 24 inches between plants and 36 inches between rows if pruned to a single leader. This prevents foliage overlap and improves airflow to reduce blight.
Can I switch between imperial and metric units in the calculator?
Absolutely—use the Imperial (ft) / Metric (m) toggle above any time. All values convert instantly, making it easy to collaborate with gardeners worldwide.
How much walkway space should I leave between greenhouse rows?
Leave at least 18–24 inches for comfortable movement. Add this buffer to the width measurement before running your calculation.
How many lettuce plants fit into an 8 × 12 ft greenhouse?
With 6‑inch spacing you can fit roughly 384 lettuce plants while still allowing a 2‑foot central walkway. Plug those numbers into the calculator to test different spacings in seconds.