PNBB 8Pcs Garden Cone Watering Spikes Flower Plant Waterers Bottle Irrigation System Garden watering device. These handy garden watering tools help deliver water where plants need it most. Get straight to the root with water spikes. Simply screw a spike onto a full bottle of water, then insert the pointed end directly into the soil near a potted plant's stalk. You can combine water and plant food in a bottle then use the water spike to deliver the ultimate nourishing fluid. Water spikes work wonders on thirsty potted plants.