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Flushing Runoff Question
- Thread starter w3rds
- Start date
Those plants are more than 2 weeks away from finishing ....
Anyway, when you do flush use plain water, you're not feeding them anymore so no need to ph
You don't say what medium you're using, but assuming it's hydro with a medium (coco, perlite etc) you need to leach it
When you're flushing ppm doesn't matter
Anyway, when you do flush use plain water, you're not feeding them anymore so no need to ph
You don't say what medium you're using, but assuming it's hydro with a medium (coco, perlite etc) you need to leach it
When you're flushing ppm doesn't matter
Absolem
Active member
The buds are nicely developed but the leaves look overfed. The yellowing on those leaves looks like nute burn as opposed to yellowing from finishing.
Soil is like a magnet for fertilizer. Even though a person may have used a low ppm during feed the medium will accumulate those nutrient ions and store them in the CEC exchange to make available for the plant later. The fourth paragraph does a good job explaining the cec in various mediums.
http://www.extension.uidaho.edu/nursery/Landscape problems/Substrate/CEC and CN ratio.PDF
Here's a study on leaching in various mediums.
http://www.css.cornell.edu/faculty/lehmann/publ/Lehmann et al., 2003, Leaching CABI book.pdf
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Here's how your leached plant should look like, thou leaves on my plant were never as dark green as on your's.
My plant still has almost 2 weeks to go before harvest, so the leaves should be really yellow/fallen off by then.
The point of leaching and flushing is to make the plant use the nutrients it has stored in the leaves and buds.
I start leaching my plants about 30 days before harvest. i grow in soil.
As mentioned, i also think your plant has more than two weeks to go, so just keep giving her plain water and in time you'll see her leaves start going pale.
Some trichs can also turn amber quite early if the tops are too close to a HPS light
My plant still has almost 2 weeks to go before harvest, so the leaves should be really yellow/fallen off by then.
The point of leaching and flushing is to make the plant use the nutrients it has stored in the leaves and buds.
I start leaching my plants about 30 days before harvest. i grow in soil.
As mentioned, i also think your plant has more than two weeks to go, so just keep giving her plain water and in time you'll see her leaves start going pale.
Some trichs can also turn amber quite early if the tops are too close to a HPS light
There is so much contradictory information about leaching out there. Half the people say you only have to flush for the last few waterings, others say a month. Id love someone to explain how weeks 4-6 of flower are the main "nutrient flood" weeks for bloom boosters etc, but I should start leaching a month before harvest?
Hell, even when you google stuff, the first result and second result will have 180 degrees of "information".
Hell, even when you google stuff, the first result and second result will have 180 degrees of "information".
Absolem
Active member
I feel your frustration. That's why I try and provide university studies instead of weed jargon. When a farmer plants their crops they first get a soil test. From that soil test they build a nutrient profile to match the grow medium they are in. Most cannabis growers never have their mediums or nutrient profile tested. This allows the farmer to not overfeed the medium thus overfeeding the plant. If you overfeed then you need to leach longer.
I posted the wrong leaching study for you in the previous post. Here's the one I wanted to give you.
http://hortsci.ashspublications.org/content/40/7/2135.full.pdf
Google "Google Scholar". "Google Scholar" is for research and studies done by universities using the "scientific method". It will clear up a lot of confusion. Your buds looked good. The plant was just a little overfed. Not a big deal. Lighten up on the feed later on so you quit charging the medium with nutrient ions. Cheers
I posted the wrong leaching study for you in the previous post. Here's the one I wanted to give you.
http://hortsci.ashspublications.org/content/40/7/2135.full.pdf
Google "Google Scholar". "Google Scholar" is for research and studies done by universities using the "scientific method". It will clear up a lot of confusion. Your buds looked good. The plant was just a little overfed. Not a big deal. Lighten up on the feed later on so you quit charging the medium with nutrient ions. Cheers
Yea, there's alot of experts out there. Many people seem to confuse flushing in hydro and flushing in soil grows. Medium-less hydro plants (DWC etc.) flush out faster than plants in soil.
Second..
..alot of people don't seem to even know what a properly flushed plant looks like = If the plant is dark green when you harvest it there's still food in those leaves and buds and the smoke won't be smooth.
As i wrote, the purpose of flushing is to get the plant matter clean of nutrients stored in the plant, and i can assure you this won't get done after few dosages of plain water when you're growing in soil.
Does your soil-plants go fully yellow if you won't give them nutes the next few waterings? No they won't and you probably won't even notice any difference in color.
When the finished bud has been flushed properly, after combustion you should see only WHITE ASH in the bowl. If the ash is black or grey it wasn't flushed well enough.
On 30 days leaching/flushing in soil..
As mentioned earlier, soil holds nutrients a good while after you stop fertilizing your plant. So for a plant that flowers 11 weeks i'll feed her till the end of week six and then start giving her plain water with not-much-run-off (leaching) for few weeks and the last two weeks before harvest i flush her with alot of run-off (flushing).
"Leaching" and "flushing" are two different things. With "leaching" you make the plant to use the nutes stored in soil and plant matter, while "flushing" means you flush the medium clean of nutes with large amounts of water so that the plant's only food-source are the leaves and buds.
The plant in the photo i posted has been leached for two weeks (plain water + TopMax booster) and as you can see the leaves are still green-ish, meaning there's still some food in them for the plant to use.
Does that plant look like it ran out of food during flowering and the buds didn't develop properly?!No. The buds are rock solid and the harvest will be very nice (250W HPS + about 5 litres of soil). My estimation is that the yield will be close to 50 grams of dry buds.
If i'll remember, i'll post you a photo of her right before harvest so you'll see how yellow she will look like then. ...but i have prolly forgotten this thread by then. LOL. So "sorry mate, i forgot" in advance.
But try it your self..
Next time you flower some plants (soil grow) do a side-by-side; one plant you keep fertilizing right till the end and the other you stop fertilizing about 30 days before harvest so that she will turn yellow..
..then you know which will smoke smoother and you don't have to go by what all the "experts" write on various forums. And i promise you, the flushed, yellow plant will be much better smoke.
Or you can just cut one top of that plant of your's right now and then compare how it smokes to the pale-yellow flushed buds you will harvest later. The dark green bud will be much harsher smoke, i promise you.
