The easiest way to apply this wonderful water retaining product. At planting time you simply drop one biodegradable packet into the hole before placing your plant. Ideal for blueberries and other container plants. The polymer granules absorb several hundred times their weight in water and release it as the soil dries. Soil Moistâ¢ Packs are designed to reduce the need for watering by 50% for the 1st season.