Mexican Petunia is not from petunia family but named so because of it petunia like flowers that bloom from morning to afternoon.
They come in 3 colours : purple, white and pink in natural and dwarf sizes. Love moisture and morning sun. It loves our tropical climate so can easily grow in pots or as ground cover. Protect it from afternoon burning sun. They propagate easily with seeds that come after flowering or by cuttings and can be very invasive.