How to Water My Plant.? Water is amazing. Made up of hydrogen and oxygen, it’s literally responsible for all life on Earth. Watering your plant is a no brainer, but how much and how often can be trickier to tell. Luckily, we have a few ideas on watering for optimum plant health. Water provides structural support, cools your plant down, and moves minerals to all the right places. Plant cells are like water balloons. When they are filled, they become stiff and your plant stands upright. When there is a lack of water, the cells deflate and the plant looks wilted — a clear sign your plant needs more water. When you water your plant, an invisible process called transpiration takes place where the sun evaporates water from the leaves through stomatal pores, causing water loss in the leaf.