Flushing your plants about a week before harvest is crucial...many dissovled solids need to be leached out of your plants to ensure smooth smoke.If you do not leach and you use chemicals(I'm 100% organic), you may be putting your health and the health of whoever receives your flowers in jeopardy.The residues left within the plants tissues can cause harsh tasting smoke which may not burn evenly or even stay lit.I recommend the ash test to determine whether or not you have flushed your plants properly...light gray to white means you are on the right track anything less than white means you have leaching to do next time you harvest. I hope this helps you with your overgrow!!