what would cause so much stretch?

[akabud]

Hey guys, i have several green poison femd plants on the go, they are grown in coco coir, fed with canna A+B, they are now in 3ltr pots and 3-4 weeks old from germ, they have grown at an explosive rate, and i fear have stretched like mad, they are under a 250 mh with the light never more than 6" from the plants adjusting every day to stop them burning.
They are now 2.5ft tall and have 5-8" gamps between nodes... not very bushy but tall, not weak looking though with 3quater inch thick stems.
Is this feno prone to this or am i missing somthin?
Temps 70-80 lights on lights off 65-70.
any help with this appreciated.

thanks

 

[fsttimes81]

To cold at night! I personally would bump the thermostat up to the 75-85 range day and only let it get down to 70 at night. Try topping them too????

 

[psycho pirate]

Did you just flip the lights to 12/12, or are they still vegging?

 

[akabud]

To cold at night! I personally would bump the thermostat up to the 75-85 range day and only let it get down to 70 at night. Try topping them too????

Sorry, those are the temps now i have switched to 12/12 the temps during veg(24/0) were 75 to 80.
thanks for dropping in

 

[fsttimes81]

Oh OK, then Sorry your chit will continue to stretch! Just my personal experience you dont want to much temp swing or cold during the first 2 weeks of 12/12. Good luck then

 

[akabud]

Oh OK, then Sorry your chit will continue to stretch! Just my personal experience you dont want to much temp swing or cold during the first 2 weeks of 12/12. Good luck then

Thanks mate, i could realy do with some one who has grown/ or links to a grow with green poison to compare.

 

[Kcar]

Too much water, too much N will cause stretch, also.

 

[Harvest]

Stretch has a lot to do with genes, but kcar is right about the N, high nitrogen will cause stretch. But since you said you were now in 12 n 12, expect them to stretch for the first two weeks or so, then they will start to focus on flowering....try topping/fimming next time as i wouldnt do it since they are in 12 n 12, that will help you get the bushes you want or what the plant is capable of, by promoting side and undergrowth.

 

[akabud]

Stretch has a lot to do with genes, but kcar is right about the N, high nitrogen will cause stretch. But since you said you were now in 12 n 12, expect them to stretch for the first two weeks or so, then they will start to focus on flowering....try topping/fimming next time as i wouldnt do it since they are in 12 n 12, that will help you get the bushes you want or what the plant is capable of, by promoting side and undergrowth.

Thanks for the replys, im aware that N will promote stretch, however they have had the same dose as all my other grows and i have never seen stretch like this, i did top 2 of them and they just kept on stretching,
i have good temps, plenty of ventilation and moving air, but cant see why these have stretched so much,
I will take some pics tomorow , maybe that will help.

Thanks again guys

 

[Grimr3efer]

Probably that part male gene in the fem seeds. Just a guess idk..