MY first flush and i have a question

Discussion in 'Hydroponic Growing' started by mechanix901, Oct 12, 2010.

  1. I bought some of GH FloraNectar ( GENERAL HYDROPONICS )
    and i was wondering if i use this during my final flush or do i just go completely H2O...

    tis all, ill update with pics since its my first grow eva
  2. use it up til the last 5-7 days for best bud taste and smell its up to you though
  3. I am in the same situation you are in
    I added the sweetener with the water
  4. Flushing is a myth
  5. There is no need to flush, it does nothing for your plants except starve them. You will have better weed if you do not flush and let the plants do what they are intended to do. Do you think plants get flushed in nature 2 weeks before they are harvested?

    Flushing is a myth created by the internet, just a myth.

    Only flush if you are having nute issues.
  6. There are many experienced growers on this forum who have said pretty much the same thing BadAxe said right here. I know I do not intend on flushing after hearing from them. Got a lot of no flushing advice in here when I asked about it.
  7. yes, and I am not yet one of them. Successful first grow, have a good 2nd grow going. But between reading from the experts, reading the science on plants, and knowing a few growers myself, well, it makes logical sense that flushing does nothing good for your plants.
  8. Perhaps you should add that flushing is worthless for DWC..
    But for anything that use evapotranspiration - like the AutoPot you can get very high salt build-ups and it will kill your plant if you dont flush.
  9. Well, then yes, from my experience, which is only hydro via DWC, yes, Flushes are worthless. I can not speak of soil or any other medium for flushing based on experience, I can only go by what I read.

    But I also did say, flushing for nute build ups is fine, if you have a purpose for flushing, then yes, its advisable. I just mean flushing at the end because it makes your plants better in some way is all just a myth.
  10. if flushing is such a myth why did my nutrient manufacturer email me an 8 week feeding chart with a "final flush" at week 8? These guys make the stuff and suggest it.
  11. In a DWC system there is no salt build up because the "media" is water.

    If you are using a system that "wicks" - the water gets used up and the salts get left behind and build up in the soil until you get to toxic levels - at which point the plant dies pretty quickly. It can take as little as two weeks to get to that level depending on how hot your nutrient solution is.


  12. Well, your choice. You can listen to manufactures, or you can listen to Botanists, who know exactly how plants live and die. Totally up to you.

    I totally believe in the not having to flush theory. but to prove it, When I get to the point where I am growing from clones (So everything can be equal) I totally plan on growing 2 clones from the same mother, in the same environment, on the same nute schedule. I will flush one, I will not flush the other. Then after harvest and cure, I will setup some blind taste tests and I will see for myself whether flushing has an impact or not. Until then, I will go on the science of plants, and my opinion will remain, unless you are flushing due to build up, then there is no reason to.
  13. Raoul, in that case, then yes, flushing would be absolutely recommended. But again, that goes back to flushing due to buildup, not flushing because starving your plants for 2 weeks will make your plants better, or more potent, or whatever. You are flushing to remove all of the build up that they system produced.

    Flushing purely for the sake of trying to improve the plant (In any system that is clean with no build up) is pointless. But there ARE reasons to flush, such as your example. Could you agree with that?
  14. I think the better question is does MJ need to be flushed when introduced to synthetic nutrients
    The people I would like to hear from would be the medical MJ patients and the individuals who work in the labs
    Actual data and results
  15. I always herd that a final flush was to reduce the chemical taste and harshness in the buds. I wouldnt want to be smoking nutrient leftovers after the bud has dried.

    Here is a quote off of another thread here at GC by G'kar

    "I 2nd that, good old H2O can't beat it.

    But then some say > Quote

    Pre harvest flushing is a controversial topic. Flushing is supposed to improve taste of the final bud by either giving only pure water, clearing solutions or extensive flushing for the last 7-14 days of flowering. While many growers claim a positive effect, others deny any positive influence or even suggest reduced yield and quality.

    The theory of pre harvest flushing is to remove nutrients from the grow medium/root zone. A lack of nutrients creates a deficiency, forcing the plant to translocate and use up its internal nutrient compounds.

    Nutrient fundamentals and uptake:

    Until recently it was common thought that all nutrients are absorbed by plant roots as ions of mineral elements. However in newer studies more and more evidence emerged that additionally plant roots are capable of taking up complex organic molecules like amino acids directly thus bypassing the mineralization process.

    The major nutrient uptake processes are:

    1) Active transport mechanism into root hairs (the plant has to put energy in it, ATP driven) which is selective to some degree. This is one way the plant (being immobile) can adjust to the environment.

    2) Passive transport (diffusion) through symplast to endodermis.

    ‘chemical' ferted plants need to be flushed should be taken with a grain of salt. Organic and synthetic ferted plants take up mineral ions alike, probably to a different degree though. Many influences play key roles in the taste and flavor of the final bud, like the nutrition balance and strength throughout the entire life cycle of the plant, the drying and curing process and other environmental conditions.

    3) Active transport mechanism of organic molecules into root hairs via endocytosis.

    Here is a simplified overview of nutrient functions:

    Nitrogen is needed to build chlorophyll, amino acids, and proteins. Phosphorus is necessary for photosynthesis and other growth processes. Potassium is utilized to form sugar and starch and to activate enzymes. Magnesium also plays a role in activating enzymes and is part of chlorophyll. Calcium is used during cell growth and division and is part of the cell wall. Sulfur is part of amino acids and proteins.

    Plants also require trace elements, which include boron, chlorine, copper, iron, manganese, sodium, zinc, molybdenum, nickel, cobalt, and silicon.

    Copper, iron, and manganese are used in photosynthesis. Molybdenum, nickel, and cobalt are necessary for the movement of nitrogen in the plant. Boron is important for reproduction, while chlorine stimulates root growth and development. Sodium benefits the movement of water within the plant and zinc is neeeded for enzymes and used in auxins (organic plant hormones). Finally, silicon helps to build tough cell walls for better heat and drought tolerance.

    You can get an idea from this how closely all the essential elements are involved in the many metabolic processes within the plant, often relying on each other.

    Nutrient movement and mobility inside the plant:

    Besides endocytosis, there are two major pathways inside the plant, the xylem and the phloem. When water and minerals are absorbed by plant roots, these substances must be transported up to the plant's stems and leaves for photosynthesis and further metabolic processes. This upward transport happens in the xylem. While the xylem is able to transport organic compounds, the phloem is much more adapted to do so.

    The organic compounds thus originating in the leaves have to be moved throughout the plant, upwards and downwards, to where they are needed. This transport happens in the phloem. Compounds that are moving through the phloem are mostly:
    Sugars as sugary saps, organic nitrogen compounds (amino acids and amides, ureides and legumes), hormones and proteins.

    Not all nutrient compounds are moveable within the plant.

    1) N, P, K, Mg and S are considered mobile: they can move up and down the plant in both xylem and phloem.
    Deficiency appears on old leaves first.

    2) Ca, Fe, Zn, Mo, B, Cu, Mn are considered immobile: they only move up the plant in the xylem.
    Deficiency appears on new leaves first.

    Storage organelles:
    Salts and organic metabolites can be stored in storage organelles. The most important storage organelle is the vacuole, which can contribute up to 90% of the cell volume. The majority of compounds found in the vacuole are sugars, polysaccharides, organic acids and proteins though.

    Now that the basics are explained, we can take a look at the translocation process. It should be already clear that only mobile elements can be translocated through the phloem. Immobile elements cant be translocated and are not more available to the plant for further metabolic processes and new plant growth.

    Since flushing (in theory) induces a nutrient deficiency in the rootzone, the translocation process aids in the plants survival. Translocation is transportation of assimilates through the phloem from source (a net exporter of assimilate) to sink (a net importer of assimilate). Sources are mostly mature fan leaves and sinks are mostly apical meristems, lateral meristem, fruit, seed and developing leaves etc.

    You can see this by the yellowing and later dying of the mature fan leaves from the second day on after flushing started. Developing leaves, bud leaves and calyxes don't serve as sources, they are sinks. Changes in those plant parts are due to the deficient immobile elements which start to indicate on new growth first.

    Unfortunately, several metabolic processes are unable to take place anymore since other elements needed are no longer available (the immobile ones). This includes processes where nitrogen and phosphorus, which have likely the most impact on taste, are involved.

    For example nitrogen: usually plants use nitrogen to form plant proteins. Enzyme systems rapidly reduce nitrate-N (NO3-) to compounds that are used to build amino-nitrogen which is the basis for amino acids. Amino acids are building blocks for proteins, most of them are plant enzymes responsible for all the chemical changes important for plant growth.

    Sulfur and calcium among others have major roles in production and activating of proteins, thereby decreasing nitrate within the plant. Excess nitrate within the plant may result from unbalanced nutrition rather than an excess of nitrogen.

    Preharvest flushing puts the plant(s) under serious stress. The plant has to deal with nutrient deficiencies in a very important part of its cycle. Strong changes in the amount of dissolved substances in the root-zone stress the roots, possibly to the point of direct physical damage to them. Many immobile elements are no more available for further metabolic processes. We are loosing the fan leaves and damage will show likely on new growth as well.

    The grower should react in an educated way to the plant needs. Excessive, deficient or unbalanced levels should be avoided regardless the nutrient source. Nutrient levels should be gradually adjusted to the lesser needs in later flowering. Stress factors should be limited as far as possible. If that is accomplished throughout the entire life cycle, there shouldn't be any excessive nutrient compounds in the plants tissue. It doesn't sound likely to the author that you can correct growing errors (significant lower mobile nutrient compound levels) with preharvest flushing.

    Drying and curing (when done right) on the other hand have proved (In many studies) to have a major impact on taste and flavour, by breaking down chlorophylls and converting starches into sugars. Most attributes blamed on unflushed buds may be the result of unbalanced nutrition and/or overfert and unproper drying/curing."

    Here is a link to the thread
  16. No problems there at all :)
  17. #17 blindbudsmoker, Oct 25, 2010
    Last edited by a moderator: Oct 25, 2010

    wow. snap, crackle, and pop much.

  18. this is cause they want to sell u some thing.

  19. I love rice krispy treats, but I gotta say, I didn't get it? :confused:

  20. any time ive had to take down a crop before i could flush my weed it snap, crackles, and pops. my wife can call it almost immidiatly if weed wasnt flushed. in her opinion changes the whole taste and burning of the herb.

    thier is no reason to flush from a plant point of view but from a smokers i feel its crucial.

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