I posted about this very common but highly showy orange-flower climber previously and talked about the typical nutrient deficiencies. This batch at the roundabout of Singapore Botanic Garden's Headquarters planted months ago is very healthy and beautifully looking, at least for now.
But if the fertilizing regime is not kept up, sooner or later the nutrient deficiency symptoms would appear again, like the ones just outside the newly constructed carpark across the NUS swimming pool some distance down the stretch of road.
By the way, I like the contrast between this climber and the yellow-veined Sanchezia nobilis.