Gardening Blog

The verdict on solarizing weeds

My weed-solarizing experiment has been running for over six weeks now. It’s been quite wet and cool this spring, so it was a little slow to start, but we’ve had a few good hot days now and I am ready to call the winner:

Clear plastic after 40 days

Black plastic after 40 days

While initially I thought the clear plastic was working the best, the black plastic seems to have the best long term results. Probably the total light deprivation.

Things I would do differently next time:

1. Use bigger sheets of plastic. The garbage bags did the job, especially on an “experiment” basis, but finicky to use on the larger scale I intend to do. Also, I’m sure a heavier weight would change the effectiveness.

2. Cut everything back right down to the ground before laying the plastic. It would go down much smoother, and you wouldn’t have such a mess of dried up stuff to clean up afterwards.

3. Sealing out the air seems to make as much difference as sealing out the light. fix the edges really well as well as any seams.

4. If possible, I would try to leave the plastic in place for a full year, as different weeds manifest in different seasons.

 

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