Both Tex-R Geodisc and Enviro LID were as effective or better in controlling weeds than weekly hand-weeding, herbicides, or the Mori Guard fabric disc. The new-generation discs are fabricated from materials such as fabric (Tex-R Geodisc), pressed peat moss (Biodisc), corrugated cardboard (Corrudisc), and plastic (Enviro LID). During the past 15 years, we have annually reused the same fabric discs (now unavailable due to high unit cost), and have tested various other weed discs, including several new-generation types and also the Mori Weed Bag. The foam disc tended to curl upward at the edges, become easily windblown, and tended to partially expose the surface of the container mix. In the 1990s, we obtained 85% reduction of container weeds using discs made from geotextile fabric (Mori Guard) or foam (similar to polyfoam used for container winter protection). Small holes allow water to penetrate but weeds germinating on the substrate often grow through them. They were made of semirigid plastic similar to 45-rpm records. The first weed disc (Weed Guard) was introduced to Ontario in the early 1980s.
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