Oriental poppies, I actually love them but haven't got the space for the hole they leave when they go over. Anything like that which looks wonderful for a few weeks early on but dies back disgracefully. Daylilies and red hot pokers can also look like a bomb's hit them when they go over...
"What is hateful to you, do not do to your neighbour".
Bananas. Love the foliage, the size and the impact, but there's no way I'm digging that up, cutting it back and wrapping it every autumn, then putting it back in every summer.
I like tropical plants in the tropics. I find things like bananas and palms when planted here always look rough around the edges with brown, torn leaves. Similarly I think begonias should stay in Brazil where the high, bright sun shows off the gaudily radiant colours to best effect. Our light, except in high summer in the middle of the day, is more muted and lends itself to softer, more restrained planting.
Posts
Clipped box hedging.
Overly tidy flowerbeds.
Overly tidy anything in a garden.
Talking of ornamental grasses - pampas grass 😂
Lazy gardener club