3x4 m Gardener'300 6mm

Gardener’300 3x4 m (6 mm) polycarbonate greenhouse – a warmer, steadier growing space

Gardener’300 3x4 m is a practical polycarbonate greenhouse that upgrades everyday growing with 6mm twinwall polycarbonate. It helps maintain a steadier temperature and a more comfortable microclimate for plants, while keeping the layout easy to manage.

Compared with thinner panels, 6mm polycarbonate typically improves heat retention and reduces temperature swings. With two doors and two roof vents, you can control airflow and help reduce condensation buildup during the season.

Best for

• tomatoes, cucumbers and peppers when a warmer microclimate matters
• starting seedlings earlier in spring and extending the season in autumn
• greens and herbs with more consistent temperatures
• 12 m² layout with beds plus a walkway for weeding and watering

Main benefits

• 6mm twinwall polycarbonate: steadier warmth and more comfortable seasonal growing.
• Adjustable ventilation: 2 doors + 2 vents help reduce overheating and condensation.
• Galvanised steel frame: 20x40 and 20x20 mm profiles with corrosion protection.
• Smart 3x4 m size: 12 m² for beds, access and efficient daily care.
• 100 cm arch spacing: balanced rigidity and stable construction.
• Faster assembly: interconnecting panels with “crab” style connectors.
• Built with a safety margin: snow load capacity up to 170 kg/m².

Technical information

• Size: 3x4 m
• Length: 400 cm
• Height: 212 cm
• Area: 12 m²
• Polycarbonate: 6 mm
• Polycarbonate sheets (6 m): 4 pcs
• Doors: 2 pcs
• Roof vents: 2 pcs
• Frame: galvanised steel
• Arch spacing: 100 cm

Choose Gardener’300 3x4 m (6 mm) if you want a compact greenhouse with a warmer, steadier microclimate and easy ventilation control.

• Greenhouse Gardener'300 Assembly Instructions

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