Another one I regret getting wrong was confusing the Welsh and Scottish national flowers. It would have been so easy to memorize them, but for some reason I didn't. So, make sure your wife knows those.
Just remember the joke; based on the Scots having a reputation of being tightfisted.
The English, Scots and Welsh were instructed to go to a garden centre and choose a national flower.
The English went straight to the garden centre and asked for the best flower.
That's easy, it's the rose, said the garden centre manager. It's expensive but...
We'll take it said the English.
The Welsh arrived and saw the English leaving and said I bet they got the best flower.
The Welsh choose a daffodil.
The Scots turned up just as garden centre was closing. Sold out, said the garden centre manager.
But what about all those flowers in that field, said the Scots.
They are just thistles said the garden centre manager. If you want those, you can have them for free he laughed.
Free you say, said the Scots.
Perhaps remember too that Daffodils are spring bulbs and the Welsh like to wear that huge flower on St David's Day, which is 1 March.