Shop Orchid Care OrchidTalk Orchid Forum Weather Station Links Nursery

Welcome to OrchidTalk Orchid Forums


The Friendliest Orchid Community on the Internet!


  •  » Learn to Repot your Orchids
  •  » Learn Orchid Care Tips and Secrets
  •  » Find the perfect Orchid for your Growing Environment
  •  » Chat with Orchid Growing Professionals

OrchidTalk - "Bringing People Together to Grow Orchids Better!"


Let us help you grow your Orchids better; Join our community today.


YES! I want to register an account for free right now!


Register or Login now to remove this advertisement.

Page 1 of 2 12 LastLast
Results 1 to 10 of 13
Like Tree16Likes

Algae and Bleach!

This is a discussion on Algae and Bleach! within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; Hello all, I have searched extensively on this forum for Algae solutions, and I wanted ...

Click here to increase the font size Click here to reduce the font size
  1. #1
    empiref's Avatar
    empiref is offline Senior Member
    Real Name
    Johnny
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    all.
    Join Date
    Mar 2010
    Location
    Lebanon.
    Posts
    101
    Member's Country Flag

    Exclamation Algae and Bleach!

    Hello all,

    I have searched extensively on this forum for Algae solutions, and I wanted to get some answers for my questions.
    So if you please bare with me, thanks.

    I have read that bleach (household bleach) can be used to get rid of algae buildup in S/H clear containers, mine are starting to get green at the bottom rapidly. The pots are big 19 cm diameter and 26 cm height. Aesthetically, it's looking ugly.

    Unfortunately, where I live in Lebanon, Physan 20 is not available, and to buy it online and ship it here, it's gonna cost me lots of money.


    • What is the recommended amount of household bleach to water that can be used to get rid of the algae buildup, and in the same time not harm the orchids (phals). In metric system please, for example, one tablespoon of bleach per one liter of water?
    • Another question is, when i pour the the bleach/water into the medium, should I close the drainage holes and leave the medium to soak? and for how long?
    • After soaking the medium, should I empty the reservoir in the bottom of the pot from the bleach/water solution and replenish it with normal water?
    • How often should the bleach/water solution be used, every month for example? as a preventative measure and as a treatment for the existing algae problem.


    Thank you all for your patience and help.

  2. #2
    catasetum-ian's Avatar
    catasetum-ian is offline apprentice
    Real Name
    ian
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    catasetums
    Join Date
    Oct 2010
    Gender
    Male
    Location
    malaysia, selangor
    Posts
    1,218
    Member's Country Flag

    Default

    Quote Originally Posted by empiref View Post
    Hello all,

    I have searched extensively on this forum for Algae solutions, and I wanted to get some answers for my questions.
    So if you please bare with me, thanks.

    I have read that bleach (household bleach) can be used to get rid of algae buildup in S/H clear containers, mine are starting to get green at the bottom rapidly. The pots are big 19 cm diameter and 26 cm height. Aesthetically, it's looking ugly.

    Unfortunately, where I live in Lebanon, Physan 20 is not available, and to buy it online and ship it here, it's gonna cost me lots of money.


    • What is the recommended amount of household bleach to water that can be used to get rid of the algae buildup, and in the same time not harm the orchids (phals). In metric system please, for example, one tablespoon of bleach per one liter of water?
    • Another question is, when i pour the the bleach/water into the medium, should I close the drainage holes and leave the medium to soak? and for how long?
    • After soaking the medium, should I empty the reservoir in the bottom of the pot from the bleach/water solution and replenish it with normal water?
    • How often should the bleach/water solution be used, every month for example? as a preventative measure and as a treatment for the existing algae problem.


    Thank you all for your patience and help.
    Hi Johnny,
    i was initially taught to use 1:9 dilution of commercial household bleach. after several tries, i modified it to 1:12 dilution.
    i usually just sprayed on top of media to get rid of the mold/algae.
    leave it there for about 10 minutes and after that RINSE THOROUGHLY (make sure you rinse it enough). that would do the trick.
    some orchids dun handle these bleach bath that well from my own observation, bulbos and very young catasetums that just send out their roots. phalenopsis had no problem with this. i had not tried on other orchid genera yet.

  3. #3
    Real Name
    Zainal Abidin Bin Othman
    Favorite Orchid(s)
    Huntleya, Bollea, Cochleanthes
    Join Date
    Apr 2006
    Location
    Melaka, West Malaysia
    Posts
    12,753
    Member's Country Flag

    Default

    Hi Johnny
    I never practice use bleach to remove algae, I don’t like it so corrosive and hate the Chlorine smell too ,very dangerous to our skin respiratory tract and maybe the plants.
    Come to basic:
    Usually algae may appear when the medium is too wet and no time to dry out.
    When use to much organic fertilizer.
    To me where I live in Equator:
    I will avoid using a media that can retain too much water.
    Limit the use of organic fertilizer at least twice a month.
    Use a basket or clay pot.
    So far it works for me.

  4. #4
    Germinatorman's Avatar
    Germinatorman is offline Senior Member
    Real Name
    Don Keim
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    Cattleya
    Join Date
    Aug 2009
    Gender
    Male
    Location
    South Bend, Indiana
    Posts
    658
    Member's Country Flag

    Default

    I would get online and search hydroponics blogs and sites, especially resellers. There must be this same issue in the hydroponics industry. I have the same issue but I just live with it. Mix water and sunlight and something to grow on, you are going to have algae.
    Don

  5. #5
    Brutal_Dreamer's Avatar
    Brutal_Dreamer is online now Dreaming with my eyes open...
    Real Name
    Bruce Brown
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleyas & Slippers
    Join Date
    Mar 2003
    Gender
    Male
    Location
    Arkansas
    Posts
    34,003
    Member's Country Flag

    Default

    You could also repot into non-clear semi-hydro containers. That should eliminate the algae problem without chemicals.

    cheers,
    BD

  6. #6
    Halloamey's Avatar
    Halloamey is offline Senior Member
    Real Name
    Amey Bhide
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya alliance
    Join Date
    Jul 2009
    Gender
    Male
    Location
    Pune, India
    Posts
    5,363
    Member's Country Flag

    Default

    I do not recommend the use bleach at all if the orchid is going to be exposed to bleach as well. If it is for empty pots then 1:9 bleach is good to disinfect and kill the algae. For Sh I recommend you use hydrogen peroxide 3%. Just pour it over the roots and let it drain. Also regular strong flushing with freshwater without any fertilizers should also get rid of the algae.

  7. #7
    pavel's Avatar
    pavel is offline change is the only constant
    Favorite Orchid(s)
    whatever will bloom
    Join Date
    May 2005
    Location
    Michigan
    Posts
    8,643
    Member's Country Flag

    Default

    I agree with Amey. A 1:9 ratio is what I use to sterilize plastic pots. I really would expect this to be far too strong of a concentration for the orchid to be exposed to.

    On a different but related note ... a friend of mine, now deceased, grew most of his plants in s/h with great success. He was, at first, worried about the algae but decided to experiment and not do anything to remove it from some of the pots. He found the presence of algae to do no harm at all. His orchids didn't skip a beat. Can't remember the source, but he later told me of something he read in which it was hypothesized that the presense of algae might actually be beneficial as the oxygen released by the algae would be readily available to an orchid's roots. Just something to ponder.

  8. #8
    empiref's Avatar
    empiref is offline Senior Member
    Real Name
    Johnny
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    all.
    Join Date
    Mar 2010
    Location
    Lebanon.
    Posts
    101
    Member's Country Flag

    Default

    Thank you all for your help!

  9. #9
    empiref's Avatar
    empiref is offline Senior Member
    Real Name
    Johnny
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    all.
    Join Date
    Mar 2010
    Location
    Lebanon.
    Posts
    101
    Member's Country Flag

    Default

    Quote Originally Posted by Halloamey View Post
    I do not recommend the use bleach at all if the orchid is going to be exposed to bleach as well. If it is for empty pots then 1:9 bleach is good to disinfect and kill the algae. For Sh I recommend you use hydrogen peroxide 3%. Just pour it over the roots and let it drain. Also regular strong flushing with freshwater without any fertilizers should also get rid of the algae.
    Amey,
    Will hydrogen peroxide 3% get rid of the algae in the medium? or is it a fix for the plant?

  10. #10
    Halloamey's Avatar
    Halloamey is offline Senior Member
    Real Name
    Amey Bhide
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya alliance
    Join Date
    Jul 2009
    Gender
    Male
    Location
    Pune, India
    Posts
    5,363
    Member's Country Flag

    Default

    Hydrogen peroxide will kill bacteria, fungii and algae. But you will have to be regular with the use, since only the dividing algae cells will die with the use of peroxide, intact mature cells won't be affected due to the strong cell wall ( the same reason orchid roots will not be harmed, but some developing root tips might be affected). I suggest treat with Hydrogen peroxide for about 15 to 20 minutes followed by a good wash and drain with pure water. Repeat every 5 days till the Algae vanishes.

Page 1 of 2 12 LastLast

Similar Threads

  1. Algae in S/H
    By nicki in forum Semi Hydro / Lights / Greenhouses / Accessories
    Replies: 4
    Last Post: December 1st, 2011, 09:07 AM
  2. Can algae damage Vanda roots?
    By jana in forum Orchid Ailments / The Compost Pile
    Replies: 15
    Last Post: March 29th, 2010, 04:54 AM
  3. bleach or peroxide...
    By GrumpyBear in forum Flasking Equipment & Technique
    Replies: 18
    Last Post: January 16th, 2010, 12:22 PM
  4. Using Physan 20 for plants getting algae in S&H
    By Becky15349 in forum General Orchid Culture
    Replies: 3
    Last Post: May 11th, 2008, 10:36 AM
  5. Algae on sphagnum
    By Liz in forum General Orchid Culture
    Replies: 13
    Last Post: June 17th, 2004, 06:31 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OrchidTalk --An Orchid Growers Discussion Forum brought to you by River Valley Orchidworks. A World Community where orchid beginners and experts talk about orchids and share tips on their care, cultivation, and propagation.