Our collection ofaquatic plantsboasts a wide variety of water plants. The consensus is that the morning is the best time to give your indoor plants a drink-especially during the hot summer months. This will allow the plant to absorb the water before it gets too hot (which can cause the water to evaporate too quickly) and dark. If you are looking forward to having houseplants that grow without soil, then you have landed at the right place! Here are some interesting Indoor plants that grows in water.