A simple solution to protecting and watering plants in grow bags with out the need to add more compost simple to fix into the grow bag the serrated teeth cut a perfectly sized hole in the plastic when in place the sloped collar makes a funnel that directs even the most clumsily aimed attempt at watering right to the roots of the plant without spillage and wastage running down the sides of the bagr r measuring 20cm across and 10cm high 4 waterers will fit in the average grow bag the w