Psuderanthemum reticulatum

This plant was intentionally planted over a known white ant nest with complex underground structures outside my fence. The white ants did not attack the plant.
Today, this plant is 3m high, the tallest and prosperous among these plants with multiple branches and inflorescences.
Environment really affects the growth of the plant. 
I guess the underground tunnels allow the roots to move everywhere easily and the white ants also produce the wastes favourable to the plant.