ive been reading through this section and im starting to think ive dropped one again
ive taken cuttings from the plug tray,potted into 3 1/2in ,my next are 5 then 6 and final are 7 1/2 (6.5l)i think are these ok thanks for any help

If it was me I'd leave out the 6" and go straight from 5" to final pots. I once tried going up only 1" in pot size and struggled to get the compost down the gaps at the sides! A good rule of thumb is to double up pot sizes when repotting.

the drobe isnt empty for 5 weeks

I've noticed over-tight, clumped-up root balls when I get rid of soil from harvested plants, usually around the 6" pot stage - so I now go straight to 10 litre square pots once I know the sex. So cuttings go into big pots soon as roots have taken and seeds usually go 2" > .5 litre > 8 or 10 litre.
I've just started to experiment with 25 litre gorilla tubs with couple of dozen 1" holes in bottom. It has worked well for a friend so far. I'll post pics when plants are nearer harvest.
Everything else is same ie> soil= Canna professional with nutrients, feed = bio-bloom only after 3-4 weeks flowering, water=rainwater (or mineral water).
Usually water plants every 48 hours (in flower , more frequently in veg) drench the plants till water drips out of bottom of pot, then wait till top 1" is dry to touch.
Not scientific, but if I only change one thing at a time I should get a good idea how to achieve the crop I want. At present I'm just playing with pot size.
All pots stand on about 1/2" of clay pebbles to aid drainage and prevent any roots poking through from getting squashed. Environment = 600hps indoor in well ventilated 'room' and greenhouse in summer.
Next set of 'experiments' will be with soil/compost type and watering schedules/quanties.
All good fun.

thanks mate but i dont have space for them size pots

general rule of thumb is small pot for two weeks medium pot for two weeks then final pot for two weeks then flick 12/12 however saying that on this grow i went for 3" pots for two weeks then straight to final 6.5l pots whilst nuking them with root juice seems to have worked well and saved the middle pot up procedure

Not really the way to do it. You get better root spread throughout the compost if you pot up in stages. Maybe you were leaving them too long in 6" pots?

I start in 3" pots and then go to 5" then 5L and finally 10L.
If you go up to final pots too soon then the roots do not properly fill the pot. They just go downwards till they hit the bottom and then just go round and round the base of the pot.
You can finish in 5L (or 6.5L) if you don't have room for bigger pots. Of course you will end up with smaller plants and have to water/fertilise more often.

Peace..

i use 5ltr pots with no bother at all water every 2days seem about right but in this size pot plants seem to grow no more than 4-5 feet

Taller pots are better than wide pots, so if you short on space but ok for height its worth considering this. Otherwise, the pots you're going to use will have to do! The only bad thing that can happen is you try to grow them too large during veg and its stresses them, so given that you're low on space just flower sooner.

You'll manage mate

Potting up is a good idea to increase yields though, and as said I think staggering in 2" steps is about right. Works for me anyway and my roots so far have been really good small pots are good in the sense that they're much harder to over water, imo.