Do I need to flush my Afghan auto?

Turns out flushing is pretty controversial, so I wanted to see if anyone had advice on whether or not I should flush based on my grow conditions. My lady is an Afghan Autoflower (almost 10 weeks old & flowering for about 4-5 weeks) in a 5 gal fabric pot, super soil base/coco & perlite topsoil, currently being fed with Fox Farms’ Big Bloom, Tiger Bloom, and Beastie Bloomz in pH balanced water. TDS of feeding solution is around 850 (keeping it low-ish to be on the safe side). She’s looking healthy with good flower formation so far (I can also post pics if needed). My main question is, do I need to flush? And if so, how, when, and for how long?

Pics would help a lot. Most autos flower anywhere from 7-9 weeks before harvest time. Some go longer, fewer go faster. But it just depends on how mature the buds are. Usually about 6-7 weeks in you can start giving regular water. You can probably give another feed before having to start flushing if you’re on the weekly FF schedule.

1 Like

2 kinds of flushes. One that involves pouring phd water through your soil rinsing salt buildup away reseting soil ph and tds. The other is restricting nutrients last two weeks of the grow allowing the plant to consume itself, for a sweeter taste of final product. Which one are you asking about?

4 Likes

Mostly sweeter bud!

2 Likes

I wait until my trichomes start to go cloudy. Then restrict nutrients. Giving them only phd water. Your right Bout controversy tons on this topic. Bout week 8 or 9 of flower. I like amber in my trichomes, if you dont start week 7 or 8 of flower.

3 Likes

The final flush is just skipping feeding the last week or two before harvest. Not an actual flush, so to say. The plant consumes and processes what’s left in the soil since you aren’t adding anything. But I don’t think you’re there yet at 5wks flower.

3 Likes

@Borderryan22 is right, pics do make for a better assesment. Besides, we are all a bunch of Bud Porn Addicts, pics are like paying us for our advice.

3 Likes




Let me know if you need different shots or angles…always happy to provide bud porn :smile:

Looks like those are going to fatten up a lot more before shes done.

1 Like

Oh yeah, she’s only about halfway through. Just wanna make sure I’m prepared for when the time comes :slight_smile:

1 Like

Nice looking plant. :ok_hand:

1 Like

Thank you so much! I’m wicked proud of her for sure :slight_smile:

Every week she fattens you’ll be saying that over n over. Good luck to the finish line!

1 Like

She looks great! Definatly keep feeding! For at least another 2 weeks, then revisit and make a decision from there.

Thats a good place, over 1000 usually burns my tips.

Be sure to watch your runoff numbers. So you know if she is getting enough food.

1 Like

What should I look for in the runoff TDS wise? I’m gonna measure it in just a sec here and I wanna get a sense of what I’m looking for…

Your tds runoff will vary depending on how much nutrient you have in your soil. You will want to watch for when that number is below 1000. That will mean its time to feed. You will also want to record the ph of your runoff. It will be different then what you poured it in at usually between .5 -.8 different dont let that freak you out, even if its below your target ph keeping track of it can show you a trend in one direction or another. This can tell you its a good time to flush your soil, and point to any lockout also.

1 Like

So my solution’s TDS was about 850 and the runoff was 280…nutrient lockout? Or something else?

1 Like

Nope thats perfect.
Your plant was hungry.
Still is by the looks of it. Next watering, record and water as usual, if tds comes back below 1000, feed again that day. Outside of that, water, dry out, feed,dry out, water, dry out, over and over and over again. 850ppm is a great feed. Ive heard several you tube pros say feeding over that can be too much.

I use an app called Jane to help me keep track of what I have going on. It has replaced the clipboards I was using. Its very helpful.


This is how I keep my records.

1 Like

Lets talk nutrient lockout.
This chart will help you.


Soil sweetspot is 6.5-6.8. In flower you want a ph going in at least 6.5 phos and potassium are key flowering nutrients. The ph determines a plants ability to consume the nutrients. You could have a billion ppm in the soil and it still couldnt consume it unless the ph is right. Too much of any one nutrient can cause ph swings which cause lockout. Did that make sense?

1 Like

Alright, it’s been about 2 weeks and here she is now…time to start restricting nutes?