when & where to prune

Im onto my 3rd crop and i'm not sure about pruning my plants i.e where to cut , what to cut, when to cut it.
1st crop 5 white widow & 5 purple haze yield about 2/3oz per plant.
2nd crop 7 super skunk & 6 skunk special yield || 1/2oz || ||
3rd crop 9 power plant & 4 blueberry clones.

3rd crop has been on 24hr using 400w hps & a fan just to keep the air moving in my loft been growing for 27 days, look nice & healthy.

2 days ago I put them onto a 20/4 cycle & they stand 12" to 18" from soil level with lots of uniform branch & leaf growth and I'm just starting to see the first of the little female hairs showing, the Power Plant are from feminized seeds and the Blueberry are cuttings I got from one of my mates' plants.

I dont have any pics with me but Ill post some up on monday 14th june 2004.
'til then
cheers
roppa69 ;)

How long are your lights on? 20/4 is no different to 24hrs to the plant. 12/12 for flowering. Should have posted this in the Cultivation section btw. :)

cheerz hvyfuel i'm on 12/12 now