These terracotta watering spikes accept standard wine bottles and slowly releases water to plant roots, keeping them nourished. You create the water reservoir by filling an empty wine bottle (or water or soda bottle) with water and attaching the included, drip-free, threaded adaptor. As the soil begins to dry, the device slowly releases more water (through gravity/diffusion).They’re perfect for keeping your plant watered when you’re on vacation (or just don’t have a green thumb). A single bottle can water for up to two weeks!