Hi! I live in Greece and the last two months I have planted a Delonix Regia from seeds I bought.

My young tree is now almost 15 cm, and recently I noticed some leaves are gettin yellow and fall. Should I use a kind of fertilizer or should I wait for colder days? (now is around 30s C)

When is the right time for prunning the youn tree?

Thank you for your help