Yellow leaves at week 10 of 12/12 Why ?

I would go with N deff, Some strains stretch hard and require a little nitro when first starting flowering to help with all the growing Should be able to feed em and see them come back, but the leafs that are already completely yellow will not go green again

I don't know what happened - a few of the fan leaves at the bottom had yellowed and a few died . I left them for 4 days and that yellow is showing more and more from the bottom up . been feeding every other watering with technaflora products and watering every 4-6 days on avg. The hairs on the buds are not browning yet at all and theres been slow growth in the last 2 weeks . The lights have been on 12/12 for 10 weeks now and I thought they would be ready soon . Nitrogen def ? or in need of some cal-mag ? I don't know .

I used blood meal just now so I guess we will see in a few days .

Ten weeks of flower? You need a scope to look at your trichs. The " hairs" are not a reliable way to tell.

Actually it took almost the first 2 weeks to see buds starting , but yes I know . been waiting patiently all this time to come in and see this is really dissapointing

if its yellow its nitrogen n if its spotty its nute burn, what are you flowering with?

At ten weeks this will happen its pulling nitrogen out of the leafs. cal mag could help. over watering can also cause them to yellow. my guess is you only have a couple weeks leftand that's when it will pack on bud.

I added cal mag plus , but still no sign of improvement yet . I never used a scope to look at the trichs but what I've grown in the past you could just tell when they were done . They look just right when it's time . For this long flowering these are obviously not ready yet . Theres no nute burnplant problem 12.jpgI havent given them enough to burn em . Heres today , no improvement .