I'm not known for my patience, but I hate to throw out a plant that's still growing. I picked up some shiny, black seeds when I was exploring the Roman ruins of Leptis Magna on a tour of Libya in 2005 and - ahem - forgot they were in my pocket until after returning home. I planted the seeds in pots, five germinated, I gave away two plants, I killed one of my three by overwatering, and the remaining two just made bigger and bigger bulbs. Finally, after TEN YEARS, one of the plants has bloomed. It's a Sea Daffodil (Pancratium) of some kind, I think.
