Plastic Greenhouses: Polycarbonate vs. Polyethylene—Which Is Right for You?

Choosing a plastic greenhouse means deciding between two very different materials: rigid polycarbonate panels and flexible polyethylene covers. Each has distinct advantages depending on your needs, budget, and site.

Polycarbonate Panels: Durability Meets Clarity

• Strength: Virtually unbreakable—used in bulletproof glass and eyeglass lenses.
• Weight: 1/6 the weight of glass; easy to handle and install.
• Light Transmission: Crystal-clear options mimic glass; twin-wall panels add insulation.
• Longevity: Resists yellowing, cracking, and impact for 10+ years.
• Cost: Higher upfront investment than polyethylene.

Best for: Permanent, year-round structures where durability and appearance matter.

Polyethylene Covers: Flexibility & Affordability

• Styles: Stretch over metal/PVC frames; can be permanent (anchored) or seasonal (pop-up).
• UV Stability Is Critical: Untreated poly degrades in months. Look for UV-inhibited film rated for continuous use (not just seasonal). A "3–5 year" rating may only mean 9–15 months of actual sun exposure.
• Installation: Must be cinched drum-tight to prevent wind fatigue—the #1 cause of premature failure.
• Replacement: Covers wear out first; confirm availability of replacement skins before buying.

Best for: Seasonal use, limited space, budget-conscious growers, or renters.

Decision Checklist

• Permanent or temporary?
• Year-round or seasonal growing?
• Budget for initial cost vs. long-term replacement?
• Wind exposure at site?

Match the material to your reality, and you'll enjoy a productive greenhouse for years.