Contact John Negus by email address below Email: amateurgardening@futurenet.com
How can we revive our faded mandevilla?
Q We have a mandevilla in our conservatory and it was healthy until two weeks ago, when the leaves started to turn brown and drop. We have fed it with tomato fertiliser, but what else can we do?
Elizabeth Boucher (via email)
A Have the conditions in the conservatory changed? At best, mandevilla is described as ‘tender to half-hardy,’ so a plant will be quite sensitive to changes in air temperature.
The RHS states that when growing mandevilla, ‘warm, humid conditions are required in spring, with daytime temperatures of
