I bet I could kill your nice neighbor's plastic flowers.

I've killed a lot of plastic flowers. I am amazing.

I have a tall cactus that has survived for a couple of years and a Christmas cactus that still looks alive.

Hmmmm. Maybe I better check. It was looking kind of sockly around Christmas. Nope. It's still green (sort of). I don't pronounce them dead til they turn completely black.