As an amateur botanist, here in Manchester, UK I had been researching the old cornfield weeds that once grew here when this was an agricultural district. I assumed that they were, more or less, extinct until I stumbled upon some heaps of soil at the back of our local cemetery (I assume that these heaps were the spoil from recently excavated graves). On these heaps were many of the old field weeds that I had read about: Poppies, Fumitories, Pansies etc. I assume that the seed bank must have been in the soil. Amazing! The dead come back to life in the midst of the dead - as it were!