The burr cucumber on the garden fence stayed green way past the first frost (early October), all the way until the first hard freeze (early November), and got hit by a number of small frosts in between. The seeds have set and I looked closely at them. They basically look like cucumber seeds but a little fuller and harder (and darker). There is no fleshy fruit, but the pods are covered with spines that actually stick into your hand (burrs I guess). As far as I know the seed isn't edible. I bit one and chewed a little...no taste. I spit it out. I wonder what disperses such a weird seed. Not easily searched for online. I think there should be a huge list or database somewhere that tells you whether each plant is an annual, perrennial, biennial, etc. and how its seeds are dispersed. Alas, I don't feel like making it!