Or having them pass on under your watch.
Please note that none of the following were under spider mite, scale, aphid et cetera attack.
Passing on all on their own can and does happen - ever grown Daphne? They can and often do just up and die (They are notorious for doing so.) Happened to me this past year - 2 of them. Obviously didn't like something. But twin Daphnes - Carol Mackie (Daphne x burkwoodi 'Carol Mackie') both died on me within weeks of each other. Sad cause I do so love Daphne. I do have another (Eternal Fragrance - Daphne transatlantica 'BLAFRA') that is doing just fine planted in the same general area, so I doubt drainage was the problem.
Aside from the bread and butter things (which happens to all of us), I have also managed to kill the following in the past 18 months or so. Sad cause some of these were not cheap.
Lady of the Night - Brunfelsia american (I have 2 other Brunfelsia that are doing just fine.) It threw 4 blooms and I thought it was too young to do so. Guess I was right. Many plants bloom up a storm just before they die.
Hebe Speciosa 'Variegata' (I should have known better, but I really did want a Hebe.) Research said that they would do well in containers outside and could over-winter indoors. Perhaps I was misled.
Bush Alamanda - Alamanda nerifolia (probably not enough humidity-if I get another, I will mist the devil out of it) Supposedly they are easy to grow.
False Heather - Cuphea hyssopifolia 'white' (guess I didn't keep the soil moist enough, though I tend to over rather than under water, so don't know).
You have any stories?