Tree Watering Stakes Deep Drip Tree Watering Stakes aid in the watering and fertilization of your trees at the roots, in addition to better aerating the soil with oxygen. Deep Drip will deeper saturate the ground around your tree allowing the roots to grow deep and strong instead of horizontally at the surface, possible resulting in exposed roots. This device is designed to work with a garden hose, flood irrigation, or in conjunction with your automatic landscape drip system. Your standard 1/4" drip line easily connects to the Deep Drip spike. And you can also add fertilizer into the shaft to continually direct nutrients to the root zone.