Bend them over as soon as possible., and dont top them. Blast them with all the light possible. They will turn into bushes if you do this, and you will keep your growing tip.
We veg with 1000w Hortilux. Give them all the soil possible. We start in 36oz plastic Deli Containers, and then transplant into 5 gallons soil, and then 20 gallons. We also veg in 5 gallon grow bags, and when transplanted simply cut the bag from them, and retransplant. No shock and easy to do. Rough up the roots a bit. Will grow into a huge hedge. Big is also genetic. We like Mr Nice Super Silver Haze for strong structured plants, and fast growing.
For outside Id use 50 gallons soil/soilless. We use Promix BX
You can also use BIG grow cages for support. Or make your own
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