Results/Conclusions Transpiration rates from trees were similar in the two stands. Shrub transpiration from the old-growth stand was only 1.4% of the tree transpiration (0.9% due to honeysuckle) but 6.7% (5.5% due to honeysuckle) from the second-growth stand. Shrub transpiration was dominated by honeysuckle in the second-growth stand. Because of its extended leaf-out period, honeysuckle continued to transpire late in the fall, when tree and native shrub transpiration has ceased. Amur honeysuckle transpired the equivalent of ~7 mm of rainfall in the second-growth site over the monitored period, whereas it transpired the equivalent of ~ 1.3 mm in the old-growth site, a greater than 5-fold increase. The additional transpiration caused by Amur honeysuckle may shorten the lives of ephemeral ponds and streams in wetlands, with adverse impacts on organisms, such as amphibian larvae, that require them.