High mallow gets a couple feet tall. It's high compared to most others in the genus, such as common mallow. Those two plants hang out in gardens, high because we invite it, and common because it's low and sneaky. Common mallow gets pulled and discarded, and high mallow seems to find its way out on its own. Like this one that showed up along a back alley in an older residential area here. High mallow has gone wild in AZ, CA, CO, CT, DE, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY, AB, BC, NB, ON, QC, and SK. Lenawee Co MI, 8/27/10. Mallow family, Malvaceae.