Journal: Basic and Applied Ecology
Location: Europe (Switzerland?)

When 50% of the leaf area of Canadian Goldenrod was removed by clipping, plants were 11.9% shorter up to 20 days, but 13.5% taller 42 to 138 after clipping began, so clipped plants were not shorter overall. However, they did have 12.2% thinner stems, and flowers had 43.2% less mass. When the plants were sprayed with jasmonic acid (a plant hormone that disturbs insect digestion and thus protects the plant from being eaten), the internodes (length between nodes) were 14.7% shorter, leaf area was reduced by 4.6%, it took 4.4 more days to flower, and flowers had 32.2% less mass than unsprayed plants.

Canadian Goldenrod – Solidago canadensis

van Kleunen M, Ramponi G, Schmid B, 2004. “Effects of herbivory simulated by clipping and jasmonic acid on Solidago canadensis.” Basic and Applied Ecology 5(2): 173-181, DOI: 10.1078/1439-1791-00225
Affiliations: Universität Zürich