Cherry trees all across Japan (not just Kyoto) are blooming earlier and earlier and this confirms that the trend cannot be explained by local urbanization alone c(https://gizmodo.com/japan-hasnt-seen-cherry-blossoms-this-ea...). However, Kyoto's transformation into a dense urban environment has for sure made the local signal worse.

same goes for famous Prague weather station Klementinum, now in concrete heat island obviously with higher average temperatures, they use to show long term trends

these comparisons are meaningless, you really need weather station in middle of nowhere (in nature away from people) for hundreds of years to get accurate readings for comparison

So the cherry blossom should correlate with the Groth of Kyoto's size?

Hint: it does not.

Hint: urban heat islands

Ah yeah. Someone who has zero idea how temperature statistics work.