@ RoadRash : yes the Autoflowering gene is also present, a very small percentage have already seeds in June while the latest start flowering end of august, this gene was combined to potent genetics to produce commercial auto-flowering strains. And yes the most of the plants are not realy potent but some are.
@ Only Ornamental : are you from Austria? ^^ I am sorry I cannot tell you where this field is exactly as it is unlike any other one I've seen and I'd like to protect it but I can tell you on the west side of the Neusiedlersee if you look around the vineyards you will find ruderalis but they grow spontaneously on different places every year...