UNDATED (KDAL) - As you enjoy a springtime hike in the Chequamegon-Nicolet National Forest in northern Wisconsin, Federal officials are warning you to keep a lookout for marijuana growing operations. Forest visitors should look for the signs of pot plantations that include isolated tents, garden tools, bags of fertilizer and garbage. If you come across a marijuana growing operation, make a note of the location but get out of the area immediately. The pot growers are often armed in an effort to protect their illegal operation. Several growing plots were found by authorities last year after tips from hunters who stumbled across them.