HELP! Yellow tips new growth and slight lime green colour

[RobReefer]

Hi again growers. Was hoping to get some advice

I am growing girl scout cookies autos from fastbud 420

4 weeks in now only fed with nutes once 3 days ago 1ml per litre so only quarter strength,plants seem to be growing fast but started showing yellow leaf tips at top and starting to go lime green.


pot size - 12l
soil - bio bizz lightmix with 3 weeks worth of nutrient
ph adjusted water between 6.3 - 6.6
light - solar extreme 500 California light work hanging at 40cm above plants
Tent - 1m x 1m x2m
Nutes bio bizz grow and bloom

thanks for any help in advance and for your patience with me.

[SoOrbudgal]

I don't know about the auto version but my photo versions love to eat the nitro during veg. stage mine are darker green. I don't know your ferts. I give mine fish/bat guano tea along with the FF grow big. Have you grown with this light before and have you grown autos with this light?

[MeEasy]

I believe your soil is still providing plenty and when you added nutes it was a little too much nitrogen for them. I know you said that the soil has three weeks of nutes but your plants roots are probably just getting to the bottom of the pot

[RobReefer]

No not grown with these lights before just bought them. My first grow I only started because prices are sky high at the minute with covid 19. Thanks for the reply guys much appreciated

[OldManGrower]

I have had the same issue. I cut my nutrients back and raised my light an inch or two. Yellow tips as you have them are not necessarily a negative sign. One of my plants develops them regularly, no matter what I do, on the older leaves. The new and younger leaves are fine and some are a lighter green than you would expect. The yellow tips are only a danger if they start curling, turning brown and expanding.

[RobReefer]

Thanks for your reply Oldmangrower that's a relief to hear by the time you research online you feel your plant has everything under the lights wrong with them and I really need these babies to produce the goods thanks again