dro

The term means hydroponic, as in hydroponically grown weed. There are male and female marijuana plants, when you let a male release pollen onto a female plant the female will produce seeds in her buds. If there are no male plants around the female plant will still produce her buds, but there will be no seeds inside, which gives the plant a lot more energy to produce THC. This is commonly referred to as "hydro", though to grow seedless bud you wouldn't necessarily need to use hydroponics. Hydroponics systems work by filling a bucket filled of hydro ton (airy rock pellets) with nutrient enriched water for a few seconds every few minutes. The plant uses little energy to grow roots as it doesn't need to expand to get nutrients it needs, and can use it's energy to grow leafs and buds.