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Our 4-piece potato grow bag, the fabric grow bag is much better at controlling the temperature and moisture content of the growing medium than traditional plastic pots. The fabric will keep your plants warm in cold weather and cool in hot Sunny weather so it doesnt overheat. ps: cloth bags may need to be watered more frequently, this is because the porous material is less likely to hold as much water as the old plastic pot material. Fabric grow bags help alleviate this problem as the roots feel the dry soil exposed to the air as they come into contact with the edges of the fabric pots. At this point, they know they have reached their growth limit. The roots become air pruned, which is essential for growing healthy plants in containers. When air pruning, you also get more fibrous roots. The fibrous root system many small root tips allows the plant to absorb more nutrients and water. Color: gray and black.