you can't see but the buds slow down growing in the last few weeks in flower and fill out
i did a test run and havest 2 plants week 7,8,9
the plants in
week 7 each weighed about 3 oz's,
week 8 each weighed about 3.5 oz's
week 9 each weighed in at 4oz's
havest 2 weeks early could cost you...