u can get early flowering genetics that still yeild big. but you wont harvest till mid to late september. look for genetics designed for outdoors in canada these will finish late august early september with good yeilds.

it doesnt matter if u plant in april or june the plants will begin to flower at the same time. it has nothing to do with how old they are it has to do with the number of hours of light and dark. when it gets close to 12 hours light and 12 dark it will begin to flower usually in mid august but this varies on your location.