In the past 2 weeks I have had to patch both of my bike tires and replace one of my son’s tires. (And he’s only been riding a month.) Some plant along the local bike path produces seeds with thorns that we keep running over.
I spent yesterday’s ride (after fixing both our bikes) looking at all the plants, trying to figure out which ones produced the thorns. No luck.
So I searched onlineby describing the seeds. Looks like sandburs, and the plants do look familiar.
I’ll be on the lookout.