(CNN) — Lake Naivasha, northwest of Nairobi, Kenya is becoming increasingly unnavigable. Water hyacinth, the world’s most widespread invasive species, is blanketing the lake, choking its fish and ...

Vancouver Island is lending Whidbey Island its battle plan for vanquishing a common foe — Scotch broom. The bright yellow ...

Amelia Ruiz-Coogan explains why learning to tell the difference between weeds and wanted plants, and indigenous and alien species, matters, especially in threatened grassland areas.