Well my plants are a little over 3 weeks i think, and they have their first set of 7 leaves, they are only about 4-5 inches tall, and my question is, when should i top them?

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I top my plants in the first 2 weeks after you start the flowering cycle.

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You can top anytime after you have a few nodes, and you can chop just a little, or quite a bit.. There are different schools of thought.. Uncle Ben's thread on the topic is stickied for a reason..

I agree born2kill, Neo you can top as soon as 2-3 nodes are there.

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Genesis 1:12: And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.

Follow Uncle Ben’s advice and you will not be sorry.

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theres alot of things that come into factor... how much space do u have???? is it an indica or sativa... the smaller u top it the less nodes you will have and less of a yeild .. .if i were you i would wait tell i have atleast 5-6 nodes....but it really depends on your height limit...hope that helps

Jeez, how does that work for you? personally i would never top any later than a couple of weeks before flower.
In my experience you really want healthy established growing tips or it slows down flowering significantly. But hey, obviously different things work for different people.

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My "Journal" When do I harvest? a no bullshit approach.

I find that its best to top as soon as your plants are established enough to live through it, giving them more veg time after the top\fim will really establish your plant well as a two (or three, or 9) stalked tree. Also with an earlier top you're promoting more bushy growth and less leggy growth.
Everyone has their own strategy and while some are better than others, its up to you to find whats best for you.

Arjan's ultra haze #1, topped a week after going into soil from the cloner.

In any event, good luck, and aim high!!!

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My "Journal" When do I harvest? a no bullshit approach.

i usually top when i transplant because the plant will be in shock anyway

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Aren't you then stressing it at both ends at the same time?

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