topping is usually an indoor technique due to space. It helps u get a bushyer plant which will yield more in small space. But in outdoor if u can u want your plants to grow as big and as tall as they can get. the bigger the plant the bigger the yield. if security is a problem do what was mentioned already LST(Low Stress Train) this actually will improove your yield because light penetrates the canopy better.

hope this helps....
GrimReefer Reviewed by GrimReefer on . Topping plants outdoors...? I was interested on everyone's opinion on topping plants outdoors. Is it even worth doing? In my mind, I do it to keep the plany bushier and do it 2 or 3 times to a plant. I also think it keeps the plant from getting too tall, which helps if they're sativas. Does this really harm the plant though? What does it do to yield? Rating: 5