Hi I have a new lemon tree about 4 feet high it was in a 10 inch pot when purchased last week and I have repotted it to a 15 inch pot and it seems healthy but the very new and green and perfect looking leafs are falling off is it in shock ? it is around 30cnow so I am not sure how often to water it I am on a very large learning curve so all help much appreciated** :(***** Morinja