By Steveo41
United Kingdom 
I have a Dipladenia Mandevilla in a container in the conservatory. It is growing around a support. However it has grown vigorously and is now top heavy to the point of falling over. I have read that I am not supposed to cut it back, is this correct? Or can I give it a good prune without causing it any harm? If I can when do you recommend I do it? It flowers in the summer. Any tips would be helpful. Thankyou.
23 Apr, 2013
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If you look at the RHS advice on growing Mandevillas, they are very comprehensive on pruning. Just type 'Mandevilla pruning' into google, and look for the RHS entry.
30 Apr, 2013