Not long ago, marijuana grow houses seemed to sprout like weeds in Miami-Dade. In 2012, for example, county narcotics detectives raided 257 illegal hydroponic labs. Most of them were hidden in unassuming suburban houses in Southwest Miami-Dade and they weren’t always nice neighbors. That year alone, shoddy wiring caused one grow house in West Kendall to explode, hurtling the roof in the air. In another case, a marijuana grower shot a Miami-Dade detective in the stomach.