Tropical Zone Gardening: poor flowering, 1 by spacehma

spacehma wrote:
I live in Jeddah, Saudi Arabia zone 10-11, in winter time the temp is about 22-35 C.Degree
every year i have this poor flowering accuring to my garden shrubs and trees. i ferilize my garden (mixed mud and sand) with organic and chemical plus ready compust periodically. the best time to grow flower shrubs begines in november thru may only. it is very eill drained and have coputerised errigation system.
what is wrong here?