When growing plants in a controlled environment you are going to have a need for a water source in the greenhouse. Most often, hobby gardeners will install a frost free water faucet of some type for easy watering use where other times we are left to haul our water to the greenhouse to water our plants.
You will learn more about when your plants need watering when you choose what type of plants you are going be growing but most often there are definite methods in learning when your plants need a little watering. You will find that what your older plants start to droop and look a little limpy they will need some watering. Water your plants at the soil level not putting water on the leaves because water on the leaves will promote black rot and fungus. When the top level of soil around the plant is dry, it is safe to say that it is time to water this particular plant.
A basic schedule for watering plants in the greenhouse is between seven to ten days depending on what time of year it is and how high the humidity level is. You will find that you will use less water when the plants are dormant in the coldest times of December and January. A dormancy period is normal for all plants, and they will also require a little less light during this time as well. Just check the dirt to tell if your plant really needs watering during this dormancy period. It could be two weeks before a certain plant needs water so you will have to be careful not to over water during this period. You will find that it is better to actually to let your plant dry for a few days by under watering than it is to over water when the plant is in the dormant stages. When you find that your plants are still moist and it has been five or six days since your last watering, pass by this plant until the next watering time to recheck this plant. It could be in a dormant stage or at least the beginning stages of a dormant stage and you wouldn’t want to over water and cause harm to this particular plant.