A simple cover for Gardyn ports, to prevent algae growth.

The foil cover is meant to hold down a piece of aluminium foil. Place a square of foil over the port and use the cover to hold it down. Poke a small hole in the middle for your seedling. as it grows, the seedling may widen the hole itself. Or you can help it, whatever.

When you're ready, tear the foil and slide the cover out of the way, without damaging the seedling.