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It all depends. If you are heading into the last two weeks and you are flushing them of the nutes, the leaves with yellow. Some even worse than that. So long as they are yellow, and NOT dry and brittle, you can be ok. Its to be expected, esp during the flush. Some people dont flush but it gives the weed a chemical wang.
If they are yellow pre flower, then you have problems. The big fan leaves will yellow when the flowers are pulling nutes from the plant itself.
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