I have a small succulent garden full of all sorts of different cacti and succulents. In the summers many of them would bake, a bit too much, so I planted a few small Eucalyptus along the west edge of the garden. Well, in no time, they became BIG eucalyptus... and now the drop a lot of leaf litter on the plants (which I try to 'blow' off with a blower as often as I can). At least they shade them well in the hot afternoon.
So far most seem OK, and definitely appreciate the shade. But I have heard so much about euc. leaves being toxic. Is that really true? Think succulents would care? If I had known how dirty these eucs. would be, I think I would have picked a different shade tree (though nothing good comes to mind).