Understanding Greenhouse Plastic: A Guide by Crop Supplies SA

What's the best plastic to use for a greenhouse? 

Choosing the best plastic for your greenhouse largely depends on your specific needs and climate conditions. Typically, polyethylene (PE) plastic is widely used for greenhouse coverings due to its durability, flexibility, and cost-effectiveness. It provides excellent light transmission, essential for promoting plant growth, while also offering adequate insulation to maintain optimal temperatures inside the greenhouse.

How thick does the plastic need to be for a greenhouse? 

The thickness of greenhouse plastic is measured in mils (one thousandth of an inch). The appropriate thickness depends on factors such as the greenhouse location, climate, and intended use. Generally, greenhouse plastic thickness ranges from 4 mils for temporary structures to 6 mils or higher for more durable and long-lasting coverings. Thicker plastic offers better durability and insulation, especially in harsher climates.

What is the difference between greenhouse plastic and regular plastic? 

While both greenhouse plastic and regular plastic are made from polyethylene, they differ in terms of additives and manufacturing processes. Greenhouse plastic is specifically designed and treated to withstand prolonged exposure to sunlight without degrading or yellowing. It often contains UV stabilizers and additives that enhance its durability and light transmission properties, making it suitable for greenhouse use. Regular plastic, on the other hand, may not have these specialized features and may degrade more quickly when exposed to sunlight.