I start when plant's are about a foot tall..I use s hook's and weight's to form plant where I want for the size canopy allotted useually 2.5 sq feet I grow 6 plant's in 4X4X7foot space 16 sq ft..I don't leave the weight on the plant after shape is what I want...fill the whole space as to not loose light...my grow ghetto cheap necessity..Different way's it's done personal preference really...see other thread's!! here's mine jackView attachment 2254493View attachment 2254494