outdoor plant having problems need help!!!!!!!!!

ok i have a godbud X misty cross that i have in a 2.5g pot,i used ffof with dolomite lime(1 cup per 1.5 cubic feet of soil)and have added zero nutes yet,the plant is about a mounth old and has only been in the ffof for 2 weeks now.it has only got rain water and when it gets too dry ill give it some un ph'ed RO gallon water i buy at a local store.the problem im having is the plants bottom leafs are gettin brown spots by the end of the leaf tips and is moving to the upper leafs

the soil is hot. you are indeed feeding. ride it out. it'll be fine, imo.