Greenhouses & Covers

Which greenhouse or replacement cover suits my growing space? Start seedlings on shelves, make room for tomatoes in a walk-in tunnel, or set up a growing space with rigid polycarbonate panels.

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Which greenhouse or replacement cover suits my growing space? Start seedlings on shelves, make room for tomatoes in a walk-in tunnel, or set up a growing space with rigid polycarbonate panels. This range includes complete greenhouses and replacement covers, film and fittings—so you can find a new structure or repair the one you already have.

Am I buying a complete greenhouse or just a cover?

A complete kit includes the frame and its covering. A replacement cover, roll of film or pack of polycarbonate panels does not include that structure. The difference matters here: both complete greenhouses and spare coverings appear in this range.

For a replacement, match the shape as well as the measurements. A curved tunnel cover will not fit a straight-sided frame simply because both are labelled 3 metres long. Door positions, shelf levels and the way the cover fastens also need to line up.

Which greenhouse suits what I want to grow?

  • Seed trays and small pots: a shelf greenhouse puts several growing levels into a small area. Count the trays that fit on each shelf, rather than treating its overall height as space for one tall plant.
  • Tomatoes and other tall crops: a walk-in tunnel gives you room to tend plants from inside. Curved sides reduce headroom near the edges, so keep the tallest plants away from the lowest part of the roof.
  • A permanent growing layout: a polycarbonate greenhouse gives you rigid walls and a framed doorway. Its usable space still needs to accommodate pots, benches and a path.

How much room will be left after adding plants?

A 3 × 2 m greenhouse has a 6 m² footprint before allowing for its frame and access. In an illustrative 2 m-wide layout, a 60 cm central path leaves about 70 cm on each side for growing. That is why floor area alone can make a greenhouse look more spacious than it will feel.

The 3 × 2 × 2 m walk-in tunnel has a roll-up entrance and six screened ventilation windows. For wider access, the 4.1 × 2.5 m polycarbonate greenhouse lists a 110 cm-wide double doorway. These are different working spaces, not simply two sizes of the same frame.

Will a greenhouse stay cool without opening it?

No. Sunlight can heat an enclosed greenhouse quickly, including on a mild day. The NSW greenhouse ventilation guidance explains why exchanging air matters for both temperature and humidity.

Look at which roof vents, side windows and doors actually open, and whether you can reach them once the plants are in. A zipped door that stays closed while you are away does not provide the same airflow as several open vents. Choose a sheltered position and use the anchoring method specified for that frame; a lightweight cover is not a substitute for secure installation.

Useful answers

Greenhouses & Covers: your questions

Is polycarbonate the same as glass?

No. Polycarbonate is a plastic glazing material. The rigid greenhouses in this range use polycarbonate panels, while many tunnels and small plant houses use flexible PE or PVC covers. Do not order a glass replacement panel for a frame designed for a different panel material or thickness.

Does a greenhouse come with shelves or a floor?

Only when those parts are listed in the package. A multi-tier plant house may include shelves, whereas a walk-in greenhouse may be supplied as a frame and cover with no shelving. A perimeter base frame is not a solid floor.

Can I use a greenhouse for plants in pots?

Yes. Allow a watering route between the pots and space for the plants at mature size. If the pots sit on benches, include the bench depth in your layout; two deep benches can leave very little room to walk through a narrow greenhouse.

Will an unheated greenhouse keep every plant frost-free?

No. It can change daytime growing conditions but cannot guarantee a safe overnight temperature for a frost-sensitive plant. Winter suitability depends on the crop, local minimum temperatures, light and whether heating is provided.