This reminds me of an elderly lady, who for a few years fed, watered, nurtured her prize blueberry bush, which repaid her by growing into a lovely strong and healthy plant.
The only thing missing was the blueberries which she had been eagerly waiting for.
Anyway, to cut a long story short, it was pointed out to her by an experienced gardener that the bush she had been caring with love and affection, turned out to be a goat willow that had snuck into the pot unnoticed and proceed to take over, as they so often do.
A bit like the cuckoo equivalent of the plant kingdom ;-)