Hello,Where i work i was given a free Gardenia tree, I have worked in the garden Center but not with that trees and shrubs as much...The leaves where yellowish and it was in a small pot so i transplanted it to the recommended pot 2× the size of the Gardenia... i put it in a sunny spot in the house it already is looking good the yellowish leaves are more green..My question is how offen should I water?And does it need to be fertilized?I also live in Michigan Zone 6a what should i expect or do?