Dormant plants you thought were dead
Have you thrown away a plant in the past because you thought it was dead but have since learned it was probably just dormant? I probably did kill some of them by watering them to death during dormancy (combined with using terrible 'soil') but am confident I could succeed knowing what I know now (although most of these are perennials where I live now.) Seems it's usually bulbs/tubers...
Bougainvillea and mandevilla (what are they calling this today?) vines
...and probably others that aren't in my thoughts right now. What would you add to this list?