My Cherry blossom that is my garden oozes stuff from it's trunk each year does this each year and is very healthy.
Too many people for whatever reason seem happy to pull up healthy trees for no apparent reason.
These trees provide cover for wildlife and lovely blossom flowers in spring time.
The High Street will lose charachter by having these established trees removed in favour of some bright architects idea that will take a long time to become established.By all means improve the greeness of the area by you don't start by ripping up the greenery that its already there.
The new area up the road that just been improved could have had more native trees planted rather than just the odd one or two that were already there.
I'd also like to see more of this money put into the Prom than the High st which isn't that bad compared to other main streets in Edinburgh and surrounding towns.