I’m a first time grower, growing purple haze from seed in coco with perlite in 5 gallon fabric pots. Im using general hydroponics micro, gro and bloom nutrients with calmag aswell. Watering every 2 days with a feed every other water. PH in is 6.0 and out is 6.3. Im using a 1m x 1m x 2m grow tent with a 600W LED that is 750mm above canopy. Im on a 18/6 light cycle and 4 weeks into veg. My problem is that the plants aren’t gaining any height. At the moment they are only 100mm from soil to top of canopy! I’m led to believe that this is not normal 4 weeks in. Other than that the plants look healthy. Any advice will be much appreciated…
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When you top your plant, you are breaking the apical dominance of the main cola and that causes the plant to stall and bush out and allow side shoots to catch up to the main cola. How far away is your light? And I would turn on both switches now and introduce some red wavelengths and that should help the plant stretch a little too 
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Thanks for the reply. My light is 750mm above canopy. I’ll try putting both switches on and see if that helps. I thought you only want the red light for flower and the blue lights for veg??
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Blue only as a seedling, but I’d run both switches once the plant is established. Especially if you want to induce some stretch
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Thanks for the help!
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My first grow right now as well, mine are a little further along though.I don’t think light is your problem if plant looks as healthy as they appear in photo, they would strech for light if its weak and cup and burn if to close. I didn’t start seeing vertical grow until 4.5 to 5 weeks when topping my main cola just as you did. Here she is now week 5 + a few days.
Demar
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Yeah I dont think light is the issue either, but I’ve turned on the bloom switch aswell as the veg now so fingers crossed it helps. Mine are nearly 5 weeks old now though and look how much further your gals are than mine. Frustrating!!!
Keep in mind soil,nuts,PH and genetics have a lot to do with things as well. I would not get discouraged just yet, they still may take off like a jet in a week or so. And each time you top something will stall it for a bit.
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Yeah thats right. Thanks for the advice! Appreciate it.
U also mentioned your watering every 2 days? That might be much. My girls @3 weeks get water 4- 6 days!
Ok cheers I’ll look at that aswell! Thanks.
If you want to test your theory, turn your blue switch off and red switch on for a week. I think @MattyBear was correct and what you are seeing is typical plant response to extremely blue dominant light recipe.
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I’ve now had both switches on for 24hrs. I’ll leave it like that for a week and see where I’m at. They seem to be responding well though so far. Cheers.
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