Plant in full sun or partial shade with regular water. It is hardy to about 25 degrees F.

Mandevilla sanderi is endemic to the State of Rio de Janeiro in Brazil. First described as Dipladenia sanderi it was moved into the genus Mandevilla in 1933 when Robert E. Woodson made significant changes within the Apocynaceae family. The name for the genus honors Henry John Mandeville (1773-1861), the British Minister in Buenos Aires, Argentina and the specific epithet honors Henry Frederick Conrad Sander (1847-1920), a horticulturist and collector from Hertfordshire, England who brought the plant back from Brazil. This cultivar was selected by Ole V Christensen in Aarslev, Denmark, from a number of naturally-occurring mutants of Mandevilla sanderi and under the name Dipladenia 'Helle' was issued a US Plant Patent PP9,117 in 1995 but this patent has since expired. We grew this plant form 1998 until 2004. 

The information displayed on this page about Mandevilla sanderi My Fair Lady ['Helle'] is based on our research conducted about this plant from books in our nursery library as well as from information that is provided by reliable online resources. We also have included our own observations made about it as it grew in the nursery gardens and other gardens visited, as well how the crops of this plant performed in the containers when we had them in our nursery field. We also include comments received from others and welcome hearing from anyone who has information about this plant, particularly if it includes cultural information aiding others to better grow it.