The spiked pepper tree (Piper aduncum) is native to the American tropics, but has made itself at home in a variety of other locales where it can crowd out local vegetation and interfere with forest recovery. Although it’s been slow to spread through Borneo since its introduction to Indonesia in 1952, new logging roads appear to be driving the species farther afield. A study in mongabay.com’s open access journal Tropical Conservation Science raises concerns that these roads may bring unintended plant colonists to new areas – putting the biodiversity of forests at risk.