Juwel BioStar 1500 Cold-Frame

The interior surface of the polycarbonate panels is treated with a special coating that prevents condensation from forming large droplets. Instead, moisture spreads into a thin film and runs down the sides, which protects your plants from the fungal issues and leaf rot often caused by dripping water.

The automatic opener is entirely mechanical and heat-activated, so it requires no electricity or batteries. It uses a wax-filled cylinder that expands as the temperature rises to open the window, and contracts as it cools to close it, ensuring your plants stay at a consistent temperature.

The 8mm twin-wall polycarbonate is significantly more rigid and insulating than standard single-layer plastic film. It provides a strong barrier against cold snaps and is UV-resistant, backed by a 10-year guarantee against yellowing.

While the unit is sturdy and weighs 20 lbs, it is lightweight enough that high winds could potentially move it. We recommend placing it in a sheltered area or using ground anchors if you live in a particularly windy region.

The BioStar 1500 is designed for straightforward assembly. Most users find the process intuitive, though having a second person to help hold the panels in place while you secure the frame makes the job much faster.

Yes, the cold frame features three large roof windows that provide excellent access to the entire interior. You can easily reach any part of the 13.11 square feet of growing space without having to remove the entire structure.