Lil rasta's 12/12 growing guide
Ok so im writing this to help out anyone who wants to or does grow 12/12 from seed. You can use this method of growing to try new strains, pick good mums or dads, have 2 oz of many strains instead of 18 of 1.
Ok so my first point is with this style of growing the plants will flower when they reach a certain age, not size or anything else. So with this in mind you normally have 3-4 weeks to grow the biggest plant you can, every now and again you get a 5 or 6 weeker these end up being huge.
There are a few things that you can do to get the biggest plant you can in that short time:
DONT pot up, start them in between 6.5-11L pots any more is a waste and I have seen no noticable yield difference between the 2 sizes often my highest yielder is in the smaller pot. advantage for bigger pot though is watering every other day instead of every day. But I also like watering every day as i can change my feeds very fast to resolve any problems.
Use a good soil mix with perlite and some bat guana if you can, root castings and seaweed would go a miss but I normally dont bother. When i add the guana i add half the amount around 3" from the bottom of the pot then mix the other half in with the soil that goes on top, that way the roots go down toward the bottom normally so when the tap root does that it will hit gold and sread out around this very fast.
DONT overwater your plant, the major reason most growers pot up. When the plant is young it will drink fuck all, so after you have watered it in then leave it for around a week (this will vary depending on many things in your room) but let the pot dry right out before they get watered again and then they will explode with growth. This works as the plant will use alot of its energy to makes roots in the first week or 2, so make it search for water and gets its roots all around the pot then when you water it next it can take up so much food.
Get your light close, fuck this give little ones less lumens, all they need is not to fry. Do the back of the hand test, if you feel any heat from the bulb move it up 2" above the tops of the seedlings and they will grow into it. Just keep them away from any heat for 2 weeks but as close as you can to the light without them getting any heat. DONT put the bulb 2 ft away and let them grow into it as then you will end up with 1ft plants, i have done this to test the age or size theory to see why or how they flower.
I normally do 9 differnt strains under a 400w and aim for 2oz a plant. This way i have a nice selection to smoke every 100 days and any keepers get cloned when they get lollipopped. There is no need to train your plants if growing this way, other than maybe lst, but suppercropping and topping majorly hurt your yield as the plant doesnt have the time to recover before flowering and again ends up being really small. If done right 12/12 plants normally end up around 3-4 foot although in my last diary i have a 6ft beast.
Try and run a humidity of between 60-80% when they are vegging as this makes the fan leaves much larger as they cant transpire water as well but as they get bigger they take in more energy as a result.
Get a fan blowing them from day one to make them root faster and make a hardier stem, this will save you alot of string being used to hold branches, although some will still have to be used as the plants havent vegged for long and therefore dont have very thick stems. That being said ive has stems as fat as my finger with no veg.
The usual things also apply like dont overwater your plants as it will majorly stall them.
Have a very good air flow as it aids plant growth.
Keep your room pest free.
remove any leaves over 50% damaged.
Make sure your day/night temp swing is under 5C for b est results but the closer the better. This minamalises strech in your plants.
I cant think of anything else now but 12/12 growing is a great method for all growers, simple yet effective. You can aim for 1-1.5gpw if this method of growing is done right. My gpw is always better if i do this methods with a 400 than a 600w. The 600w is normally nearer the 1 and the 400 nearer the 1.5
Hope this helps someone
The Following 139 Users Say Thank You to lil rasta For This Useful Post:
baked biker (26-07-13),
blue cheese (20-10-12),
Bubbles LM (15-12-12),
Butch Roughlove (02-07-13),
Dr. Stoned 2.0 (05-10-13),
glasgow grower (17-08-12),
green grass (01-04-13),
james bond (29-10-12),
King Chong (20-09-12),
Lab Rat (15-10-12),
Lil Sindigo (17-08-12),
Mo Lodders (19-11-12),
Mr Pothead (14-09-12),
THE DUDE ABIDES (10-08-12),
Toke `till you choke (21-02-13),
urban grower (30-09-12),
Nice lil Rasta, Good read mate, Cheers
I will be 12/12ing from now on. Just finishing my first 12/12 from seed, White Widow. It has gone really well and thanks for this info, i will refer back to it for my next grow...
solid advice LR - might use it to sex/weed out weak phenos from a 10 pack. Ill post any Qs here
A few other things i forgot
Growing a pure indica on this method will produce a fairly low yield, nearly half of a hybrid or sativa. anything better than a 75-25 will grow much better than a pure indica in this method.
I feed from day one, many dont but i have done tests and it does make them grow faster. Ill leave that up to you to decide.
Bend all the fan leaves under branches as soon as you can to promote their growth, time is limited.
get to try many strains
Good if one plant is a runt, as its no big deal
Use less electric
heat is more managable
Easy to test growing methods as it doesnt take long.
better yields than auto's
Less food and water needed
Tends to lead to more plants to yield the same as less with some veg time. ( 4 plants per 1m square if vegged, 9 if 12/12, for me anyway)
Plants require support as they tend to be weak stemed
No plant of the month winners
The Following 4 Users Say Thank You to lil rasta For This Useful Post:
Nice guide!! Do you think this set up would work with 9 plants in a 80cm x 80cm tent?
It would be tight but was thinking with 6L airpots that may stay smaller as not a massive pot size.
It would be using a 400w HPS.
Great guide btw
The Following User Says Thank You to Chilled For This Useful Post:
Originally Posted by Chilled
That would get rather tight, i normal have a minimum of 1m square, i prefer 1.2m
nice read mate,some stuff to take into consideration there.
very nice read, im seriously thinking about going 12/12.. how do you think i will get on with 400w cooltube and dual spec? and will i be able to manage 3 plants in a 80cm 70cm 6ft high space?
sorry for the questions
i sue the same thing cooltubes and 400w dual and a fan at canopy keeps the bub 4" away, put the shortest plant under the bulb and the taller round as it gets them all closer to the light.
3 plants will fit in the fine dude, i would try 4 but i like to fill my space.
The Following User Says Thank You to lil rasta For This Useful Post:
cheers man, i gonna do it! what size pots do you finish in mate? i totally get your point of not potting up too soon.. i think this thread could be my 12/12 bible.. you dont mind if i ask a few questions if i get in the shit?
not potting up even.. im thinking could i get away with starting and finishing in a 9"?
I dont pot up at all using this method, threat them like an auto just with less light .
I dont know pot sizes by inchs but i use between 6.5-11L pots with no yield difference at all dude, but bigger pots need less often watering. But any more than 11L is just a waste wit a 12/12 grow
The Following 2 Users Say Thank You to lil rasta For This Useful Post:
Nice thread man, re 2 x 65w cfls enough to do 2 plants 12/12 from seed, i just do 1 auto at a time and my best yet is 45g dry, would i be better off with one or 2 fems on 12/12??
The Following 2 Users Say Thank You to mogzy For This Useful Post:
Thats not much light but yer you cn still grow 12/12, i would try 2 see how it goes, if it gets too busy just do 1 next time
Originally Posted by mogzy
i just got my 4 airpots delivered today,had to build them myself too hahaha
only 10ltr pots but bloody hell man they are big.
im sure they will help me out when i start my 12/12
Yer dude im sure they will help, ive never used airpots as i have alot of normal ones but they shuld work better as they let more air into the roots
Originally Posted by smokymcpot
The Following User Says Thank You to lil rasta For This Useful Post:
Check out THCtalk.com competitions and promotions
The Following 2 Users Say Thank You to keeno For This Useful Post:
lil rasta (30-08-12),
urban grower (30-09-12)
yeah this needs a sticky,ive been back to this diary 5 times to try and remember something lol
The Following 2 Users Say Thank You to smokymcpot For This Useful Post:
lil rasta (30-08-12)
The Following User Says Thank You to d00by82 For This Useful Post:
Tags for this Thread
THCtalk.com Disclaimer - You must be over 18 years old to view/use this site .THCtalk.com does not encourage growing Cannabis or possessing Cannabis. Learning how to grow Cannabis instructions should be for educational purposes only. All Information contained in this web site is for: Historical reference, Scientific reference and Educational purposes only. Visitors to this website are advised against breaking the law as It is illegal to smoke, grow, or possess cannabis in the UK