What is Guyabano? The guyabano tree or soursop tree is a low-branching bushy fruit tree. Also referred to as the guanabana and huanaba this tropical evergreen produces glossy, dark green foliage and blooms pale yellow flowers on its twigs,as well as on its branches and trunk. Its large, heavy fruit is a heart-shaped syncarp with an aromatic pulp and cream color. A truly tropical tree, the guyabano requires ideal temperatures and care for successful growth and fruiting.