The Aliens Have Landed

I knew they would - It was only a matter of time. The invasion continues . . .


(Have you worked out what it is yet?)

[Added 12/09/15]


Now to reveal what this image was:
The clue was in the terms 'Alien' and 'Invasion' which referred back to a recent blip (https://www.blipfoto.com/entry/2086261222126128471) of Himalayan Balsam (aka 'touch-me-not'). My posted blip is of the left-over remains of the seedpod which falls to the ground when the capsule explodes and ejects the seeds. (I was trying to pick a blackberry at the time.)