You'll probably find varying opinions, but "IMHO", if they come off easily, they are finished giving any benefit to the plant and should be removed. However, in some cases, as in final flowering, yellowing leaves are a natural effect. and sign that the plant is useing the stored sugars and nutrients from within. In turn making a more pleasurable flavorfull final product.
well my plant is like 3 weeks into flowering and theres a lot of yellowing going on amongst the leaves...if thats just a sign that the buds are taking up nutes and sugars thats all good...but i've noticed a slow down in vertical growth, its a about 2 feet tall now..do u guys think it will grow another foot in the next 3-4 weeks??
...also from experience, how much do u guys think a 3ft tall plant would yield approxiamtely?...is 3oz possible?
After the first 3 weeks of flowering, the plant stops growing vertically and focus'es it's energy into putting out buds.
-There is no way to estimate how much a 3' tall plant will yield in buds.
A spindly plant, given little nute's or grown in poor draining soil or under inadequate light won't produve nearly as much as a bushy healthy plant.
Could you get 3 oz. off a 3' tall plant? Sure.
You could also get 1/2 oz.