Tex-R® Geodisc - Weed Control Discs for Containers -9" Size. Placed and secured on tops of potted plants to provide 99% plus weed control from weed germination and weed seed emergence from the planting mix. Select the Geodisc size slightly larger than the soil line diameter. Also great for new planting in the landscape to provide many years of weed control. Other benefits include water savings (500 Discs)