Can I cut the useless leaves off.

How do you know they are useless? When the plant decides its useless it will discard it, so just let it do its thing.
 
Will cutting the useless leaves off while still in veg harm my plant.

I pluck some of the large fan leaves off in veg to slow down growth or control it better, the growth is stunted for about a week or a little longer until it recovers.
In general though a good rule of thumb is to leave the leaves alone. They are the solar panels for production.

- if you do however-

I highly recommended you know the strain you're growing before just plucking leaves off. When or if you do its only to slow down growth or for training such as bonsai.
I grew the same strain exclusively for almost a year straight before I started plucking leaves off. I know how she will react and adjust accordingly. I have a purple diesel that I plucked leaves off and she did not like it at ALL. She adjusted but it took over 3 weeks before she started growing again, she is doing great now but had I been relying on her I would have been in for a bumpy ride. So be careful.
In a tight SOG (4 plants per sq/ft) plucking leaves off is a must in flower but that is another subject.

Just my experience so take it with a grain a salt, shot of tequila, and a bag of chips.
bongsmilie
 
Depends on style of growth. I have plenty of "useless" leaves in my v-scrog. Thou useless is a poor word, more like in the way.
Don jus cut leaves off because yu've deemed them unnecessary. Your plant grew them for a reason.

Sir KK
 
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