The Brahmaputra Valley semi-evergreen forests blanket the alluvial floodplain of the upper Brahmaputra River, spanning northeastern India (chiefly Assam, with Arunachal Pradesh and Nagaland), southern Bhutan, and adjacent Bangladesh. As the name implies, the natural cover is semi-evergreen forest, mixing an evergreen canopy of Syzygium and Cinnamomum with deciduous trees such as Terminalia, Bombax ceiba, and Tetrameles, an understory including Mesua ferrea, and stands of bamboo. The climate is monsoon-driven, with heavy southwest-monsoon rains from June to September that flood the plain and renew its fertile silt, giving way to a cooler, drier winter. Though much of the original forest has been cleared and only a small fraction is protected, the surviving reserves are globally important: Kaziranga National Park holds the world's largest population of greater one-horned rhinoceros, alongside one of India's largest Asian elephant populations, and the golden langur is among the ecoregion's flagship species. For gardeners, several signature trees here, including the red silk-cotton Bombax ceiba and the fragrant-flowered Mesua ferrea, are long-grown as tropical ornamentals.

At a glance

About the tropical & subtropical moist broadleaf forests biome

Warm, wet, highly productive forests — including tropical rainforests — with closed canopies, near year-round growing seasons, and the richest terrestrial biodiversity on Earth. Low seasonality and high rainfall sustain dense, layered vegetation from canopy to forest floor.

Catalog plants suited to this ecoregion

Computed from each plant's stated USDA zone range against this ecoregion's CHELSA-derived current zone range, with the CHELSA mid-century warming delta applied for the projection. Plants whose stated range falls outside both the current and projected zone end up dropped; the rest land in one of the three buckets below.

Collections for this ecoregion

Curated multi-plant collections whose members all fit this ecoregion's zone range — no won't-grow members smuggled in. Overall fit class shown per collection is the weakest link across its members.

Related ecoregions