GD - how far back are you going for non native? The Romans brought all sorts with them - lavender, rosemary etc - and just how much good native plant material is there on Guernsey? Not your clematis, I'll bet. Rhododendrons? Azaleas? Hostas? Roses other than dog?
The trick is not to avoid introductions but to use them well so they encourage wildlife to feed, shelter and breed and don't invade or over power natural habitats and that's down to thoughtful, responsible gardening and gardeners.
Anything with the words DWARF and MIXED makes me depressed, particularly the thought that plant breeders have put a lot of time and effort into creating these degenerate strains of what were often quite nice plants to begin with.
Even Verbena 'Lollipop' makes me a bit twitchy. It's Verbena bonariensis... it's SUPPOSED to be tall!
May I add artificial lawn? I know it isn't strictly a plant but......
Cacti with fake flowers and eyes glued on.
Posy says:May I add artificial lawn? I know it isn't strictly a plant but......
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That really is the worst IMO. Total abomination.
On a plant ID group 'elsewhere' I saw dip dyed Sansevieria
The painted neon heathers....
Fast growing 'privacy' evergreens which only reach 6ft, have all year round flowers, need no maintenance and can be grown in a pot.
OK, they don't exist but I wish people would stop asking for them!
I love pansies and violas. They are just the cheeriest wee things and they work so hard. I despise fancy grasses. And begonias. Does anyone actually like begonias? Not a fan of those smelly lillies either.