An important part of the landscape in Alzenau is the large amount of area given over to Streuobstwiesen (meadow orchards), which with their tall, unclustered trees furnish an important habitat for species that have become rare, such as the red-backed shrike or the little owl.
Also ecologically very important are the Sandmagerrasenflächen in the Alzenauer Sande conservation area, on which a few threatened and endangered wasteland species find their habitat.