Hackberry nipple gall on the underside of hackberry leaves

Oh the Gall! Strange Growths on Leaves

July 30, 2018 | Emily Stine
One of the most frequent questions I get around this time of year is “what is growing on my leaves?” while being handed a hackberry leaf with knobs on the back. These knobs are galls – abnormal growths on leaves and stems with a number of different causes, mainly insects and diseases. In the case...Learn more