flushing question

[typical-apr]

my plants av bin flowering for 7 weeks,they r about 10% brown,the leaves r yellow and begining 2 die.not sure about triches i dont have a mag glass.wen do i need 2 fush can u explain the method 2 me as this is my first crop,and i am unsure of wot n wen i have 2 flush.cheers sorry about the spellings ha ha

[wert]

flushing at the end of the grow is basically just watering the last week or two before harvest.
flushing or more correctly leaching during the grow is to wash away any build up of salts that can cause lock out of nutes.this is done by flushing and thoroughly soaking the soil with about three times the pot capacity of ph'd water ,some people even use 10%nutrient solution as this helps the leaching.