Tropical Zone Gardening: Need help again for plant ID, 1 by balaitalisai

balaitalisai wrote:
These red plants were just perfect when they were planted over 6 months ago. I was told that they are very manageable and mostly used as accents. But they have grown rather profusely and produced those white button flowers which may look attractive but can get overwhelmingly unruly. While the vertical growth can be solved by regular pruning, the horizontal growth is another thing. They have almost tripled the area size alloted for them and are invading the half moon garden.

Can you please ID these red plants? Are they what you call "invasive'? Is it better to just replace them?