I top right after I’ve transplanted and watered the plant in. I figure get all the stress out of the way at once. Once you’ve transplanted enough though, you can do it without shocking the plant. That way the only stress it actually endures is the topping itself.
Also, when talking about stretch, it’s all strain/pheno dependent. I’ve had two plants from one strain both stretch differently. Typically sativas will double in height, so if it’s 2 feet it will be 4 feet. Indicas usually only about 1.5 times the size of the plant so 2 feet becomes 3 feet. This depends on your container sizes as well. You’re probably not gonna have an 8 foot plant in a 3 gallon pot. You can typically estimate about a foot per gallon with some outliers, I just had a 5 foot plant in a 3 gallon container, and a 2.75 foot plant in a 3 gallon the previous grow.
Let us know how it goes though!
Also, when talking about stretch, it’s all strain/pheno dependent. I’ve had two plants from one strain both stretch differently. Typically sativas will double in height, so if it’s 2 feet it will be 4 feet. Indicas usually only about 1.5 times the size of the plant so 2 feet becomes 3 feet. This depends on your container sizes as well. You’re probably not gonna have an 8 foot plant in a 3 gallon pot. You can typically estimate about a foot per gallon with some outliers, I just had a 5 foot plant in a 3 gallon container, and a 2.75 foot plant in a 3 gallon the previous grow.
Let us know how it goes though!