Wahiawa Botanical Garden, Botanical garden between Wai'anae and Ko'olau mountains, Honolulu County, Hawaii.

Wahiawa Botanical Garden is a public botanical garden in Honolulu County, Hawaii, set in a natural gulch between the Wai'anae and Ko'olau mountain ranges. Paths wind through sloped terrain planted with tree ferns, palms, and tropical species from across the Pacific region.

The site began in the 1920s, when the Hawaiian Sugar Planters' Association leased land from the State of Hawaiʻi for experimental tree planting; most of the garden's large trees date from that era. The property was transferred to Honolulu in 1950 and opened as a botanical garden in 1957.

Many of the plants here come from across the Pacific and parts of Asia, showing how closely Hawaii has been connected to its surrounding regions. Visitors can observe species that are still used today in traditional crafts and everyday life on the islands.

The garden sits at a higher elevation where the air tends to be cool and wet, so sturdy shoes and a light rain layer are worth bringing. Some paths are sloped and parts of the terrain can be uneven, which makes walking comfort worth planning ahead.

The garden sits inside a natural gulch that traps moisture and blocks wind, creating growing conditions found normally only at greater mountain heights. This means some plants growing here would not survive in the lower, drier areas of the island just a short distance away.