buds of Ixora coccinea
Ixora are hardy in the tropics, they can withstand longer dry season than most plants here. Moreover, they can tolerate some shading, but they really prefer full sun from sunrise to sunset.
Firespike or Odontonema strictum buds
This plant loves partial shades and cannot flower profusely when fully exposed to the hot sun. When planted into hedges, they give a lovely atmosphere which is favored by insects like butterflies.