A while back I was trying to find my first clump of saffron crocus (Crocus sativus). I thought they had died or something, but no, they were just in a spot I did not expect. This illustrates the value of permanent non-biodegradable plant markers. I am now killing off the parsley plant that has overwhelmed them by pulling off all its leaves, repeatedly.
So very little saffron this year that I put what I harvested in vodka to make a very tiny bit of cordial.