Hanging planter boxes are a beautiful way to display flowers, herbs, leafy vegetables, strawberries, and more. WHAT IS THE BIGGEST CONTAINER GARDEN PROBLEM? Containers often dry out quickly, requiring frequent watering. Bloom Master solved this problem by pairing coco coir,tain water retention crystals together. These materials retain more moisture than traditional soil mixes. Plus, they also allow space for healthy root formation. The Minute Soil+ coco coir is amended with NPK to support healthy growth. Enjoy a healthier and more full planter box this year with this high water retention planter box kit.