The Difference Between Geodomes and Traditional Polytunnels

If you're planning to grow your own food or plants in Ireland, you've probably come across two main types of protected growing structures — geodomes and traditional polytunnels.

 Both designs have their strengths, but choosing the right one depends on your space, climate, and goals. Here's how they compare.

Structure and Shape

• Traditional Polytunnels are long, curved frames covered with strong UV-stabilized polythene. They're simple, cost-effective, and offer excellent growing space for rows of crops.

• Geodomes, on the other hand, are dome-shaped with a network of interlocking triangles that form a strong, self-supporting structure.

💡 The dome shape naturally distributes wind and snow pressure evenly — making it one of the strongest designs in the world.

Strength and Stability

Irish weather can be harsh — strong winds, rain, and occasional storms.

• Traditional tunnels are sturdy when properly anchored but can face pressure on flat sides during heavy wind.

• Geodomes are extremely wind-resistant because their spherical design allows air to flow around them smoothly.

If your site is in an exposed or coastal area, a geodome may be the more durable choice.

Light and Temperature

Both designs use UV Open Polythene, but the way sunlight moves inside differs:

• Polytunnels offer linear sunlight — ideal for long planting beds.

• Geodomes scatter sunlight evenly across all angles, reducing shadows and promoting even plant growth.

🌞 Geodomes also have better natural air circulation, keeping the interior cooler on warm days.

Space and Usability

• Polytunnels give more usable straight-line space, perfect for growing in rows and organizing equipment.

• Geodomes offer more vertical growing space — great for hanging plants, tall crops, or vertical gardening setups.

If you prefer a clean, walkable layout for large-scale planting, a traditional tunnel is best. If you're experimenting with diverse crops or educational gardens, a geodome is a beautiful choice.

Cost and Maintenance

• Polytunnels are generally more affordable and easier to repair (individual cover replacement).

• Geodomes can be more expensive upfront due to their complex structure but last longer with minimal maintenance.

Conclusion

Both geodomes and traditional polytunnels perform exceptionally well in Ireland's climate — it simply depends on your needs.
If you want maximum growing space and value, go for a traditional polytunnel.
If you want architectural strength, style, and all-around airflow, consider a geodome.

👉 Polytunnels Ireland supplies both — built to last, built for Irish weather.