Op don't listen to me listen to the majority of the industry (commercial growers, dispensars, breeders, etc). Most of the science that doesn't want you to flush comes from nutrient companies and their affiliates that lose money everytime a grower does a 2 week flush. Rx green technologies and others like it want you to load that baby up with their nutrients until the last day of the plants life. My advice to anyone that's not sure what to do is do your own test and go from there.
The difference is not huge but at worse case scenario you're saving yourself mixing time and money on nutrients your not using for 2 weeks.
Just for the record the Rx Green Tech study does not suggest feeding until harvest, I believe their nutrient line has a suggested "flush" during the last weeks if I remember correctly. It simply shows
there is no difference in nutrient levels between flushed and none flushed cannabis. The logical conclusion would be that feeding with just water the last week or 2 would save some money on nutrients, which is counter to your claim they are just trying to sell more.
Until recently "flushing" was described as pouring 3x the volume of your medium worth of water through the medium. It can be useful to correct extreme over feeding or nutrient imbalance, but can still be damaging to the root system so it should be avoided unless necessary. Flushing has no merit at all for removing nutrients from the plant, or making the smoke smoother or the ashes burn whiter.
Just using water the last 2 weeks because the medium/plant has plenty of nutrients already is just called "
watering" your plant....... Its very reasonable to use plain water for the last couple weeks. Most plants won't actually be uptaking many nutrients at that point anyway, and it saves on nutrient cost.
The key is not to get these things confused. People started changing the definition several years back at this point, it really doesn't make sense.
