Shop Orchid Care OrchidTalk Orchid Forum 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 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 28
Like Tree20Likes

Phals under light problem

This is a discussion on Phals under light problem within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Awesome advice from all. I will try magnesium since it is currently handy. But with ...

Click here to increase the font size Click here to reduce the font size
  1. #11
    moniluhum is offline Senior Member
    Real Name
    Monica
    My Grow Area
    Greenhouse
    Join Date
    Dec 2012
    Gender
    Female
    Location
    New Orleans, Louisiana
    Posts
    989

    Default

    Awesome advice from all. I will try magnesium since it is currently handy. But with this information brings more questions. What causes the magnesium addition? Is it not in fertilizer? Also, being grown under lights, is there an added need for it? Could I perhaps supplement the water ( I use RO ) every now and then?

  2. #12
    sciencegal's Avatar
    sciencegal is offline Senior Member
    Real Name
    Karin
    Join Date
    Apr 2015
    Gender
    Female
    Location
    New Mexico
    Posts
    701

    Default

    It isn't in all fertilzers. Phals seem to have a high need for it and I am just guessing that if they are under stronger light conditions they need even more. This source says:

    "Conditions such as, low soil pH, low temperatures, dry soil conditions and high levels of competing elements, such as potassium and calcium, reduce the availability of magnesium. Under such conditions, magnesium deficiency is more likely."

    My well water has a lot of calcium in it. A few years ago I started using magnesium on everything and saw amazing improvements. I am now using rain water more than well water on the orchids but I still give the phals a soaking of magnesium about three times a year.

    I read further in the source which said:

    "Deficient plants that are exposed to high light intensities will show more symptoms."

  3. #13
    moniluhum is offline Senior Member
    Real Name
    Monica
    My Grow Area
    Greenhouse
    Join Date
    Dec 2012
    Gender
    Female
    Location
    New Orleans, Louisiana
    Posts
    989

    Default

    Karin You mentioned yours are in bare root. How are you growing them? also, would be a bad idea to perhaps water every now and then with the magnesium solution or more diluted version?

  4. #14
    sciencegal's Avatar
    sciencegal is offline Senior Member
    Real Name
    Karin
    Join Date
    Apr 2015
    Gender
    Female
    Location
    New Mexico
    Posts
    701

    Default

    They are in glass containers. Most have about a quarter of the roots always in rain water. About once every 10 days I fill up the container with well wa
    Posted via Mobile Device

    ---------- Post Merged at 05:27 PM ----------

    #### this stupid tablet .... well water with dilute fertilizer. I let it soak for an hour then rinse the roots with rain water, rinse or clean the vase if needed then put it back with a little water in the bottom. It is working very well. I use straight magnesium about three ti.es a year on all of the orchids and every other plant I have. Since fertilizers can have potassium and calcium both which interfer with take up of magnesium by the plant I think it is a good idea to use it separately. I suspect the plant stores and recycles it, but I'll have to research that.
    Posted via Mobile Device

  5. #15
    raybark's Avatar
    raybark is offline Senior Member
    Real Name
    Ray Barkalow
    My Grow Area
    Porch/Patio.
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,876

    Default

    Quote Originally Posted by sciencegal View Post
    "Conditions such as, low soil pH, low temperatures, dry soil conditions and high levels of competing elements, such as potassium and calcium, reduce the availability of magnesium. Under such conditions, magnesium deficiency is more likely."
    Note that the reference is about soils, not orchid media.

    Soils have much higher cation exchange capacity (CEC) than do orchid media, courtesy of the included clays and fine organic matter. Under some conditions, those exchange sites will strongly hold some nutrient ions, making them unavailable for dissolution, hence unavailable to the plants.

    With orchid media, with far fewer of such sites, if the ions are in the applied solution, they are available to the plants.

    Monica, if you are using MSU RO or K-Lite regularly, your plants are likely getting sufficient nutrients, including calcium and magnesium. What I saw in the images were desiccated leaves, suggesting insufficient water uptake, due to either insufficient watering, or bad roots.

  6. #16
    moniluhum is offline Senior Member
    Real Name
    Monica
    My Grow Area
    Greenhouse
    Join Date
    Dec 2012
    Gender
    Female
    Location
    New Orleans, Louisiana
    Posts
    989

    Default

    Thanks Ray, as always full of knowledge. i gave them an overnight bath in magnesium which should help with the dehydration problem.

  7. #17
    sciencegal's Avatar
    sciencegal is offline Senior Member
    Real Name
    Karin
    Join Date
    Apr 2015
    Gender
    Female
    Location
    New Mexico
    Posts
    701

    Default

    You might take the worst case out of the media and see if it has any roots other than the ones showing around the outside of the pot.

    And yes I know the article was referring to soil magnesium (pretty impossible to find anything about uptake of minerals in orchids other than one finding that there was little difference between three genera) but the point was that factors can influence the positive or negative uptake of magnesium. Since the older leaf on one of them shows mottling it would suggest that photosynthesis is being affected which can be caused by magnesium deficiency.

  8. #18
    moniluhum is offline Senior Member
    Real Name
    Monica
    My Grow Area
    Greenhouse
    Join Date
    Dec 2012
    Gender
    Female
    Location
    New Orleans, Louisiana
    Posts
    989

    Default

    I did repot two of the phals last night. One had many strong roots all around the plant. The other had fewer healthy roots but then again there werent many bad ones. I like to grow in fir bark, perlite, and charcoal. I guess I need to find the right amount of watering needed. I follow the less watering the better considering I have been dealing with fungal issues. I also just bought a LED light that at this time is the lowest for both growth and blooming to get the plant accustomed. I will need to determine the right amount of watering to prevent the dehydration problem.

  9. #19
    sciencegal's Avatar
    sciencegal is offline Senior Member
    Real Name
    Karin
    Join Date
    Apr 2015
    Gender
    Female
    Location
    New Mexico
    Posts
    701

    Default

    Did the roots look dehydrated? If they looked plump and strong I would think there is another issue causing the dehydration. I mentioned the magnesium deficiency because I had recently seen some other reports (not on this forum) from some people who had very similar issues. The roots were good but the leaves were limp and had that mottled green look. One person was using fertilizer that had no added minerals so came to the conclusion that it was a magnesium deficiency. She referred to a couple of articles on mineral deficiencies in orchids that seemed to confirm it. Her phals were also getting high light in a window.

    I was having lots of issues with watering when my phals were in media. Usually I was underwatering. Sometimes the roots were just dead and not from rot. I am having much better success now that I can see the roots.

  10. #20
    chemist's Avatar
    chemist is offline Senior Member
    Real Name
    Svetlana
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    Phals, catts, catasetums
    Join Date
    Jul 2014
    Gender
    Female
    Location
    Long Island, NY
    Posts
    472
    Member's Country Flag

    Default

    how often do you water your phals? I grow mostly cattleyas under light but have few phals.
    My home temp is about 72F on average and under lights ( HO T5 4 feet 4 bulbs) it gets over 80F. This winter i run humidifier close to my shelf with orchids so humidity is about 50%. With all that i have to water twice weekly. and they actually look that they can take more watering. (phals are on top shelf meaning light fixture from lower level warms the top shelf, there is about 2 inches clearance between heat generating ballast and bottom of pots.
    Name:  PicsArt_1483370050824[1].jpg
Views: 297
Size:  85.7 KB
    You also use slotted pots with pretty coarse bark so your media probably drys even faster. My phals are in regular 4" plastic pots with medium size bark (orchiata power plus 1/2 to 3/4 inch bark size).
    Name:  phal.jpg
Views: 70
Size:  67.7 KB

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. Phals and light...sun? my dilemma!
    By empiref in forum Orchid Ailments / The Compost Pile
    Replies: 6
    Last Post: April 29th, 2012, 05:58 PM
  2. The problem with phals in wood baskets
    By tucker85 in forum Phalaenopsis, Oncidium, & Intergenerics IN BLOOM
    Replies: 5
    Last Post: April 9th, 2012, 11:21 AM
  3. Regular phals & mini phals
    By Dee in forum New Growers: Ask the Senior Members
    Replies: 4
    Last Post: November 6th, 2010, 10:44 PM
  4. Switching from natural light to artificial light
    By Alplily NH in forum Semi Hydro / Lights / Greenhouses / Accessories
    Replies: 6
    Last Post: September 26th, 2010, 02:13 PM
  5. Phals with higher-light orchids?
    By poetiscariot in forum General Orchid Culture
    Replies: 9
    Last Post: June 26th, 2009, 07:48 PM

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.