When you are working out the best ways to irrigate your plants so they grow well, become healthy and produce great crops (if vegetables or fruit) or flowers (if flowers), you need to be able to control their water intake. At certain times of year plants need more water than at other times. They need to be encouraged to root and grow and it can be easy to overwater them at the wrong time, or not give them enough water when they require it most. Setting up drip lines gives you much more control than just using a hose or a watering can. You can use a Flow Control Tap, which is a plastic barbed in line valve, to control the flow of water through drip lines or turn the flow off altogether. It puts you in charge of how much or how little water your plants get.