Plants need enough water to saturate the top half of the root zone at least once a week, as nutrients in the soil need water to enter the plant. For newly planted hemp, this area may be only a few centimeters deep. But as plants reach maturity, root depth can be 36 inches or more. Keep in mind how often you water your plants and note this in a log.
Have your marijuana plants have an irrigation schedule as they grow out of the seedling stage, watering every two to three days is ideal. Too much or too little water can be equally harmful to marijuana plants. The amount of water an individual plant needs depends on several factors, including the stage of its life cycle, soil type, and temperature. As a basic principle, it should be borne in mind that cannabis plants should be watered every two or three days.
The exact frequency of watering is determined by the variables listed below. The amount of water needed depends on the weather, but it's best to calculate two to three gallons per day, per plant at maximum consumption. You can't run out of water when plants need it most. Using unfiltered tap water will, for most growers, be the cheapest and easiest option.
And in many cases, that will be more or less sufficient. Purdue University's Hemp Project reports that most hemp varieties need between 25 and 30 inches of rain a year, especially in the first few weeks of life. Learning to grow feminized hemp requires practice and repetition, as well as the knowledge to select quality feminized hemp seeds for your growing efforts. Hemp is not as immune to drought as its supporters claim, according to a soil researcher at Colorado State University who analyzed two years of Colorado hemp production.