I've had my Adenium Boehmianum for almost, em!, maybe 4 years. I leave it in the most sunny place and water on this schedule:

• summer - every week;
• spring/autumn - every fortnight;
• winter - once in a month.

It has leaves 3-4 months a year as it should, but I've never seen it bloom.

What I'm doing wrong? What is the right care scheme for Adenium Boehmianum?