the light that binds
For the cloning / seedling stage , this number can be cut in half , so 20W per square foot is adequate for starting seeds or rooting clones . LED and fluorescent systems can be purchased in a wide variety of wattages , so finding one that fits the exact area of a cloning / seedling space is not difficult .
Light Duration for Clones / Seedlings
Although there is debate regarding the duration of the lights on cycle for the cloning / seedling stage , most professional growers rely on a 24-hour lights on cycle . One solid argument for the 24-hour lights on cycle is it makes it easier to keep the temperature and humidity consistent . If a grower decides to give the plants a dark period during this stage of growth , the plants should still receive at least 18 hours of light per 24-hour cycle . This will ensure they are conditioned for vegetative growth .
If the grower wishes to have a perpetual garden , a high cloning success rate is imperative for success .”
The Early Vegetative Stage
One crucial stage of plant development that is often overlooked by horticulturists is the early vegetative stage . The early vegetative stage refers to the stage of growth immediately following the root development of a clone or the period of growth right after the second pair of true leaves appear on a seedling . The early vegetative stage is the stage where rapid root development occurs and is also when the plants should be introduced to more intense lighting . The most common lighting systems used by professional gardeners during the early vegetative stage are T5 fluorescents . However , LED , HID , and other horticultural lighting technologies can be used effectively during this stage as well . It is a good idea to introduce the plants to a light intensity ( per square foot ) similar to what they will experience for the rest of the garden cycle .
118 Maximum Yield USA | February 2017