a Nicandra or Shoo-fly Plant or Apple of Peru, Nicandra physaloides. This is one of my favourite flowers because it will grow and flower until late in the year, almost all year round if kept inside. It's also very easy to grow from seeds. But if you have one plant in your garden, it's really hard to get rid of and will pop up everywhere, the seeds are so tiny that they get carried away with the slightest wind one the seed vessel bursts. The flowers will turn into lovely laterns, allowing the seeds to ripen within.