cyccommute 

Wishful thinking. Goatheads (Tribulus terrestris) produce prodigious amounts of a woody caltrop seed. They can produce hundreds from a single plant. They also exist for a very long time on the ground with their sharp points just waiting for something to come along and pick them up. Fall is the time when most of them cure out as the vine dies back but the seed remains sharp even through the winter.

What’s even worse is that the seeds can lay fallow for up to 50 years and still sprout.