Please help white widow yellowing 3 weeks into flowering ??

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Was there a dramatic change in pH at some point?

Ouch dude, I wish i knew how to help you. I hope your plant pulls through! Best of luck!

In fact It has been flowering for around six weeks, its an indoor plant with a 400hps, I have been just giving it water for about 4-5 weeks?? It is looking close? Should i remove all yellow leaves??

nah,,just leave the the leaf's till you chop,,,peace

When should i chop???

Don't worry about the yellowing, it's normal. The plant should be getting fed with high P nutes. You don't want to feed a flowering plant nitrogen. It will use all the stored nitrogen in the plant which is good as it helps with flavor. Flush the week before you harvest. You should get a magnifying glass and check the tric's, when they are mostly amber it's ready....... Good luck and good grow..

my hindu skunk is 4 wks into flower and my leaves have begun to yellow. i flushed them and it didnt seem to help so today i gave them a light dose of food and will see what happens. i think w.w. is an 8 week plant. good luck

Ive grown WW before and it is a very sensitive strain when it comes to nutes. I highly doubt they will finish by the 8 week mark its def better to wait until the beginning/middle of the 9th week or even longer to get the full potency.

The 2nd pic is exactly how mine looked. I guarantee it is a Magnesium deficiency. It also seems to be coupled with a phosphate deficiency. Go to wal-mart and buy some epsom salt and add 1/2 teaspoon per gallon of water. Then add some nutes high in P.

Make sure you PH your water after u mix in the nutes/salts. This is CRITICAL step that many people dont do. Get some cheap strips from a pool store. PH should be between 6-6.8. Add a little baking soda to bring the PH up and then retest. If its still too low then add more and test again until its right. If you harvest within the next week or so you will be disappointed with the end product because it could have been so much better. It really packs on density and crystals within the last 3 weeks so wait it out. Good luck!

looks good towards the end of harvest your plant should start yellowing naturally because it is useing up all its essesential sugars to promote bud growth.

I agree with smokez 100%,

I third smokez input, everyone else is right too, but you should try to pull these out a few more weeks. Its all in the trichomes! Catch them just before they go amber, once they go amber they are starting to lose thc. You may want a few trichs amber but not most, it all depends on how you like your buzz, the later u wait the more heavy the high will be and the earlier the lighter it will be!

Next time you do this dont start flushing until week 6 at least. Yellowing is normal for not giving it nutes- its the Nitrogen deficiency thats making it yellow. You have smaller nugs than you should because you need to give them plenty of nutes from week 3 to 6 especially. You should chop those down and start over since your not going to get much more growth and they are flushed