Growing vegetables and herbs year-round in Australia is theoretically possible in most climates, but practically limited by the cool nights and occasional frosts of winter, the extreme summer heat that burns tender seedlings and the spring and autumn temperature swings that make germination unreliable. A greenhouse manages all three challenges.

Polycarbonate greenhouse panels offer better insulation than PVC covers and are more impact-resistant. Twin-wall polycarbonate traps a layer of air between two layers of plastic, providing meaningful thermal insulation that helps maintain temperatures above ambient in cool weather. It diffuses light rather than passing it directly, which reduces scorching in the intense Australian summer sun.

PVC cover greenhouses are more affordable and lighter to assemble, making them a practical starting point for gardeners who want to trial greenhouse growing before committing to a permanent structure. Quality PVC covers with UV treatment last 2-4 seasons before the plastic begins to degrade and should be replaced when light transmission reduces noticeably.

Sizing should be chosen with expansion in mind — most gardeners who try greenhouse growing wish they had started larger. A walk-in greenhouse allows taller plants, better air circulation and the ability to bring in larger seedling trays and propagation equipment. The minimum practical walk-in greenhouse for serious vegetable production is around 2m x 3m; 3m x 4m is more comfortable and allows a work table inside.

Shading, ventilation and watering systems are the most useful accessories. Shade cloth reduces heat during Australian summer days; automatic or manual roof vents manage humidity and prevent overheating; drip irrigation or capillary watering systems reduce the frequency of manual watering.

Browse our greenhouse range online with fast delivery across Melbourne and Australia.