The islets of Adralaid and Puhtulaid were taken under protection for the first time in 1939, the prohibited botanical-zoological area of Virtsu-Laelatu-Puhtu was founded in 1957 and Puhtu-Laelatu Nature Reserve was first founded in 2003.
The wooded meadow of Laelatu is considered one of the most species-rich communities in Europe with more than 400 species of vascular plants and 30 species of moss growing there. In addition, 2/3 of all the orchid species growing in Estonia have been found in the wooded meadow.