how do i induce hydrangea to flower in the tropics?

Some require lots of sun while some are better off in the shade although most of them will grow well with morning sun and afternoon shade. The oakleaf does okay in extreme heat while other hydrangeas do not. If in complete shade, all of the hydrangeas will have problems blooming. Spacing of the plants is also important, so follow the instructions that come with the plant. When transplanting hydrangeas, it is best to plant them when they are blooming or dormant.

Caring for Hydrangeas

Most hydrangeas require moist soil but need to have good drainage. The oakleaf is especially sensitive to root rot if the soil does not drain well. They need fertilizer and for a thriving plant with blooms, provide fertilizer frequently.

Hydrangea Care - http://www.perennial-gardens.com/flower-articles/h...

http://www.doityourself.com/stry/getting-your-hydr...