Which plants need saucers?

AdRock

I’ve got most of my pot plants on feet to improve drainage, I know there are a few potted plants that benefit from a saucer especially if we have another hot summer. Are there any obvious contenders that would be better off with a dish? I’ve got Lillies, bananas, hosta, various ferns and grasses. 

B3

If i find a pot is drying out too quickly, i put a saucer under it. If it's getting too wet, i take it away.
I go more by position, weather and ratio of plant size to pot size rather than variety. If the plant has developed a large root structure and is heading towards needing repotting, i would definitelyuse a saucer.

Fairygirl

I'd agree with B3. You have to be quite careful with leaving saucers under pots. 
Most of those mentioned do like a fair bit of moisture, but you need to be vigilant about how long you leave a saucer under them. A combination of getting plants dehydrated well if they look a bit dry, but then leaving them alone until it happens again, and checking them regularly. 
You can also put the pots in a shadier spot if possible, which will help prevent moisture escaping as quickly, especially if the pots are grouped together.