Clwyd,
United Kingdom 
planted oleanders in april, are growing well but no flowers
14 Sep, 2010
Answers
A few varieties of Oleander tend to bloom only once in spring. 'Little Red' and 'Mrs. Roeding' are infamous for this,
14 Sep, 2010
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They may yet throw out a few before the winter strikes - remember they need protection from cold, not being fully hardy.
14 Sep, 2010