I didn't know this was a plum tree: the first year it did nothing at all, the second year it made a few tiny, hard green marbles that fell off. This year it is festooned with plums. They have a different flavour if you eat them straight from the tree. Not more sweet than what you buy in the shops, but different, tastier.
The double hollyhocks look like little powder puffs threaded onto a string.