If you’re serious about gardening or growing plants year-round, choosing the right greenhouse plastic is one of the most important decisions you’ll make. Whether you’re protecting your plants from harsh weather, extending your growing season, or simply creating a stable environment for your crops, the right plastic can make all the difference.

In this guide, we’ll break down everything you need to know about greenhouse plastic in 2024, from the best types available to installation tips and maintenance strategies. Whether you’re a seasoned grower or new to greenhouse gardening, this article will help you make the best choice for your setup and keep your plants thriving all year long.

Looking for the best polycarbonate greenhouses in 2024? The Best Polycarbonate Greenhouses To Buy In 2024 For People On A Budget

What Is Greenhouse Plastic?

The main difference between greenhouse plastic and regular plastic is how it’s built. Greenhouse plastic is designed to be more durable, last longer, and handle things like UV rays from the sun without breaking down as quickly. Regular plastic tends to get brittle or wear out faster when exposed to sunlight or rough weather.

Benefits Of Greenhouse Plastic

Using greenhouse plastic comes with a bunch of benefits:

UV Protection:	Shields plants from excessive sun exposure, preventing scorching.
Light Diffusion:	Spreads sunlight evenly throughout the greenhouse, promoting even plant growth.
Insulation:	Keeps the greenhouse warmer in cooler months, extending the growing season.
Durability:	Designed to withstand harsh weather and prolonged sun exposure without breaking down quickly.

In short, greenhouse plastic is the perfect material to cover your greenhouse and give your plants the best possible environment to thrive.

Types Of Greenhouse Plastic To Keep Your Eye On:

When it comes to greenhouse plastics, there are several options to choose from. Each type has its own benefits, depending on what you’re looking for in terms of cost, durability, and how much light your plants need.

Let’s go over the most common types:

Polyethylene Plastic (PE):

This is the most popular greenhouse plastic because it’s affordable, flexible, and easy to install. However, it’s not as durable as other types and usually needs to be replaced every 3-5 years.

Polycarbonate Plastic:

Known for its durability, polycarbonate is much tougher than polyethylene and can withstand harsh weather like wind and hail. It lets in plenty of light while diffusing it to protect plants (1). Though it costs more than polyethylene, it’s a solid long-term investment due to its longevity.

Polyvinyl Chloride (PVC):

PVC is strong and flexible, making it a good choice for areas with unpredictable weather. It’s easy to install and shape, but it may need additional UV protection to avoid breaking down from sun exposure over time.

ETFE Plastic:

This is a newer, high-end option known for its exceptional durability, lasting up to 20 years. It retains heat very well, making it ideal for colder climates, but it’s more expensive than other options, which may be worth it for its long lifespan and insulation.

Comparison Chart

Type	Cost	Durability	Light Transmission	Best For
Polyethylene (PE)	Low	3-5 years	Good	Budget-friendly, mild climates
Polycarbonate	Medium-High	10+ years	Excellent	Harsh weather, long-term use
PVC	Medium	5-7 years	Good	Flexibility, varied climates
ETFE	High	20+ years	Excellent	Cold climates, long-term use

This should help you get some information on what you’re looking for.

Key Features to Look for in Greenhouse Plastic

UV Resistance:

UV resistance is important because it protects your greenhouse plastic from breaking down due to exposure to the sun. Without it, the plastic will weaken and crack much faster. To check if the plastic is UV-resistant, look for a label or description that mentions UV protection or UV-treated material.

Light Transmission:

This refers to how much sunlight passes through the plastic. You want a balance between letting in enough light for your plants to grow, but also diffusing it so the sunlight isn’t too harsh. Good greenhouse plastic will spread the light evenly, helping all your plants get the same amount.

Thickness & Durability:

The thickness of the plastic (measured in mils) affects how well it insulates your greenhouse and how long it will last. Common thickness options are 4 mil, 6 mil, or more. Thicker plastic (like 6 mil) is more durable and provides better insulation, which is important if you live in a colder area.

Anti-drip or Anti-condensation Features:

These features help prevent water droplets from forming on the inside of the plastic, which can lead to mold or mildew. Anti-drip plastic stops condensation from falling onto your plants, keeping them healthier and preventing potential damage.

Our Top Recommendations:

Here are some recommendations on where to buy greenhouse plastic for you:

#1:  Inslat Clear Plastic Film (PE Plastic)

This 6 mil UV-resistant polyethylene greenhouse cover is strong, tear-resistant, and built to last. It helps maintain a steady temperature and spreads light evenly to support healthy plant growth. Plus, it has a feature that stops water from dripping onto plants, which can prevent damage.

At 10′ x 26′, it’s a good size for different greenhouse setups and offers protection from tough weather, allowing you to grow plants year-round. It’s a great choice for anyone wanting to boost plant growth while shielding them from the elements.

Overall, this plastic is durable, helps create the best conditions for your plants, and is versatile, making it a smart, long-term investment for dedicated gardeners and farmers.

Check Price ➡️ Amazon

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#2: DGSL Polycarbonate Panels (Polycarbonate Plastic)

These 14 pieces of 2′ x 1′ x 0.16” twin-wall polycarbonate panels from DGSL are a great option for year-round weather protection in your garden or greenhouse. They keep things warm in winter and cool in summer. Made from strong, double-wall polycarbonate, they let in 80% of sunlight to help your plants grow, while also being sturdy enough to handle tough weather and resist breaking.

These panels are easy to cut and install, making them ideal for greenhouses, gardens, or even as roofing material. They’re a great improvement over traditional iron sheds, providing better light and protection against leaks.

Check Price ➡️ Amazon

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#3: Spectra Glass Polycarbonate Sheeting

The Spectra Glass 24″x24″ polycarbonate sheet is an excellent choice for greenhouses or any project that needs a strong, clear material. It’s lighter than glass but still super tough, giving your plants plenty of sunlight without worrying about it breaking. It also has UV protection on both sides to prevent yellowing over time.

Easy to work with, you can cut, drill, or shape it to fit your needs. Made in the USA with accurate dimensions, it’s ideal for window replacements or any DIY project requiring clear, durable material. It’s a reliable option for keeping your greenhouse in great shape year-round.

Check Price ➡️ Amazon

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How to Choose the Right Greenhouse Plastic for Your Garden

Choosing the right greenhouse plastic can feel overwhelming, but breaking it down into key factors will help you make the best decision for your setup. Here are a few things to consider:

1. Climate and Location

The weather in your area plays a huge role in what type of greenhouse plastic you should choose. Think about how hot or cold it gets, as well as other weather conditions like wind or hail.

• Extreme temperatures: If you live in a place with very hot summers or freezing winters, go for thicker plastic, like 6 mil polyethylene or polycarbonate sheets. These materials provide better insulation, helping to keep the greenhouse warmer in the winter and cooler in the summer.
• Mild climates: If your area has moderate temperatures year-round, a thinner plastic, like 4 mil polyethylene, might be enough. It’s cheaper and still provides decent insulation, but won’t be as durable over time.

2. Type of Plants You’re Growing

Different plants thrive under different conditions, so you’ll want to choose greenhouse plastic that matches their needs.

• Vegetables: Many vegetables need lots of light and warmth. A plastic that offers high light transmission and good insulation is ideal. Polyethylene with UV protection works well for this.
• Flowers: Most flowers benefit from diffused light to avoid scorching. Polycarbonate panels, which spread light evenly, can be a great choice.
• Herbs: Herbs generally prefer slightly cooler, well-ventilated environments, so choosing a plastic with ventilation options (or thinner material) can be helpful.

3. Longevity and Cost

You’ll want to think about how long the plastic will last and how often you’re willing to replace it. While thicker materials are more durable, they’re also pricier. But sometimes, paying a bit more upfront is a smart investment if it means fewer replacements down the road.

• Thicker plastics (6 mil or more): These provide better insulation and durability. They may cost more initially, but they tend to last longer (up to 4-6 years or more).
• Thinner plastics (4 mil or less): These are more budget-friendly but won’t last as long, typically needing replacement every 2-3 years.

4. Greenhouse Size

The size of your greenhouse can also influence which plastic you choose.

• Small greenhouses: If you have a smaller structure, you can often get away with less expensive plastic like 4-6 mil polyethylene. These are easy to handle and still provide good protection for plants.
• Medium to large greenhouses: Larger setups benefit from more durable materials like polycarbonate, which offers long-term durability and better overall protection, especially in areas with tough weather conditions.

Installation Tips for Greenhouse Plastic

When installing greenhouse plastic yourself, follow these basic steps for the best results:

1. Start by measuring your greenhouse to make sure you have the right amount of plastic.
2. Lay the plastic over the frame, leaving a few extra inches on all sides.
3. Secure the plastic starting from the center and working your way outwards to avoid wrinkles or loose spots.

To make sure your plastic is well-insulated and long-lasting, it’s important to use the right tools. Wiggle wire and clips are great for securing the plastic tightly in place, ensuring it stays durable through all kinds of weather.

Some common mistakes to avoid include pulling the plastic too tight (which can cause it to tear) or not securing it enough, leading to flapping in the wind. Take your time to do it right the first time, and your greenhouse will be ready to go.

Here is a helpful video to show you the process:

How to Maintain and Extend the Life of Your Greenhouse Plastic

Maintaining your greenhouse plastic is crucial if you want to keep it functioning as it should. With the right care and a few preventative measures, you can avoid costly replacements and keep your plants thriving. Here’s how to take care of your greenhouse plastic:

1. Regular Cleaning

One of the simplest ways to extend the life of your greenhouse plastic is to clean it regularly. Dirt, dust, and grime can build up on the surface, blocking sunlight and creating a breeding ground for mold or mildew.

• What to Use: Stick to mild soap and warm water. Harsh chemicals or abrasive cleaners can damage the UV coating or weaken the plastic, causing it to break down faster.
• How to Clean: Use a soft sponge or cloth to gently wipe the plastic. Avoid using scrubbing brushes or anything too rough, as these can scratch the surface and reduce the plastic’s ability to transmit light.
• Frequency: Aim to clean your greenhouse plastic at least once every few months, or more often if you live in an area with a lot of dust, pollen, or tree debris.

2. Inspect for Wear and Damage

Greenhouse plastic will naturally wear over time, especially if it’s exposed to constant sun, wind, or harsh weather. Regular inspections can help you catch issues before they become big problems.

• What to Look For: Check for small tears, holes, or any signs of discoloration (especially yellowing, which could indicate UV degradation). Also, keep an eye out for areas that seem overly stretched or loose.
• Why It Matters: Small tears or holes can quickly become larger, especially if the wind catches them. UV degradation can cause the plastic to become brittle and prone to cracking.
• How to Fix: If you find small holes or tears, use greenhouse plastic repair tape or a patch kit to fix them as soon as possible. The sooner you patch them, the better your chances of preventing larger damage.

3. Protect Against UV Degradation

One of the biggest threats to greenhouse plastic is UV rays. Even if the plastic is UV-resistant, prolonged exposure can eventually lead to wear and tear.

• How to Protect It: Make sure your plastic has a UV-protective coating, which should last for several years. However, if your plastic is several years old or if you notice signs of yellowing or cracking, it may be time to replace it.
• Pro Tip: Consider installing shade cloth or using other forms of sun protection during the hottest part of the year to reduce UV exposure, especially if you live in a very sunny climate.

4. Prevent Condensation and Mold

Greenhouse plastic can develop condensation on the inside, especially in humid conditions. Over time, this can lead to mold or mildew, which can damage the plastic and harm your plants.

• Anti-Drip Plastic: If your greenhouse plastic has anti-drip or anti-condensation properties, this helps reduce water buildup inside. However, if you don’t have this feature, regularly ventilate your greenhouse to keep moisture levels down.
• Ventilation: Make sure your greenhouse is properly ventilated to allow air circulation. You can install vents or fans to reduce moisture, especially in areas where humidity is high.

5. Proper Installation and Tension

A lot of damage to greenhouse plastic comes from improper installation. If the plastic is too loose, wind can catch it and cause it to flap, leading to tears. If it’s too tight, it may rip when the temperature changes or if pressure is applied.

• Ensure Proper Tension: When installing or re-securing your greenhouse plastic, make sure it’s tight but not overstretched. The plastic should be snug but have a little give, so it can adjust to temperature changes without tearing.
• Re-secure Regularly: Over time, plastic can loosen. Check the tension every few months and re-secure any loose areas using clips, wiggle wire, or other securing tools.

6. Winter and Seasonal Considerations

If you live in an area with extreme seasons, such as heavy snow or strong winds, your greenhouse plastic will need extra care during these times.

• Snow Load: Be sure to remove any snow buildup on the roof of your greenhouse. The weight of snow can put stress on the plastic and lead to sagging or tears.
• Wind Protection: If you live in a windy area, make sure the plastic is tightly secured and reinforced in key areas. Consider installing windbreaks or barriers around the greenhouse to reduce the impact of strong winds.

By staying on top of these maintenance tasks, you’ll keep your greenhouse plastic in great condition, providing your plants with the best growing environment and saving yourself the hassle of premature replacements.

Conclusion:

Choosing the right greenhouse plastic is key to creating a successful, year-round growing environment for your plants. By understanding the different types of plastic available, considering your climate and plant needs, and following proper installation and maintenance practices, you can ensure your greenhouse thrives for years to come.

Whether you’re looking for durability, light transmission, or protection against harsh weather, there’s a perfect greenhouse plastic out there for you. Now that you’ve got all the information you need, you’re ready to make the best choice for your garden and keep your plants healthy no matter the season. Happy gardening!

Here are our favorite greenhouse accessories: 14 Best Greenhouse Accessories That You Need In 2024

FAQs

What kind of plastic is used for greenhouses?

The most common plastics used for greenhouses are polyethylene (PE), polycarbonate, and sometimes polyvinyl chloride (PVC). These types of plastics are designed to be durable, flexible, and able to withstand different weather conditions while letting in enough sunlight for plants to grow.

What is the difference between greenhouse plastic and regular plastic?

Greenhouse plastic is specifically made to last longer outdoors and protect plants. It is designed to resist UV rays, offer better insulation, and handle tough weather conditions like wind and hail. Regular plastic, like what you might use for covering furniture, can easily break down under sunlight and isn’t built for the needs of a greenhouse.

Why is greenhouse plastic UV resistant?

Greenhouse plastic is UV resistant because it’s treated with a special coating that blocks harmful UV rays. Without this protection, the plastic would break down faster in the sun, becoming brittle and prone to cracking. UV resistance also helps protect the plants inside by reducing the risk of sunburn and excessive heat.

How thick does greenhouse plastic need to be?

Greenhouse plastic typically ranges from 4 mil to 6 mil in thickness. A 6 mil thickness is more durable and provides better insulation, which is important in colder climates. If you live in a milder climate, 4 mil plastic can work, but it may need to be replaced more often.

Can I use painter’s plastic for a greenhouse?

It’s not recommended to use painter’s plastic for a greenhouse. Painter’s plastic is thin and not designed to handle the sun, wind, or weather that a greenhouse is exposed to. It will break down quickly and won’t provide the right level of insulation or protection that greenhouse plastic offers.