OK, So here's the scoop. I start out with already mixed soil. Let them veg about 6 weeks (NO dead leaves, no problems at all). Then switch them to Flower, the first 2 - 3 weeks of flower they stretch and look nice (Nothing dead or yellow), then "all the sudden" the whole things gets yellow and leaves start turning brown and falling off after 2-3 weeks into flower faze, until it's time to harvest. I have tried not giving them "any" extra nutrients and I have tried giving them the good nutrients (Big Bug etc... from the hydro shop down the RD but I give them it at half the strength) and then I tried using Bud booster which is strong enough stuff and they all act exactly the same. 2 - 3 weeks into flower the whole thing starts to slowly turn a yellow and then the leaves turn brown curl and fall off until only the little leaves in the buds are left. I have checked the PH which is a nice 6.8. I can not figure out what is causing this and its driving me crazy! Any idea's all? Thanks for any help. When it's all done it's good herb, just I don't understand why the leaves are acting the way they are. Temp 70 - 87 PH 6.8 medium: soil Growing indoor Watering when the first inch of soil is dry. Pics attached.