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 2 of 2 FirstFirst 12
Results 11 to 19 of 19
Like Tree7Likes

Phal with dark green /red leaves

This is a discussion on Phal with dark green /red leaves within the Phalaenopsis ('moth orchid') Information forums, part of the Frequently Asked Questions category; Root photosynthesis is a popular fallacy, but a scientific imposibility. Photosynthesis requires free flow of ...

Click here to increase the font size Click here to reduce the font size
  1. #11
    Dorsetman's Avatar
    Dorsetman is offline Senior Member
    Real Name
    Geoff Hands
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya ?
    Join Date
    Oct 2010
    Location
    England, South coast.
    Posts
    2,689
    Member's Country Flag

    Default

    Root photosynthesis is a popular fallacy, but a scientific imposibility. Photosynthesis requires free flow of gases into and out of the cells, so as let in the needed carbon dioxide, and that diffusion requires effectively open holes. Roots don't have that kind of structure. Sure they have passages through which water can enter the cells, but they are not ooen ports. The water passes through a semi-permeable membrane,due to osmotic pressure.
    But why would a plant even need to photosynthesis in its rootts ? It has specialist structures for that purpose, called leaves.

  2. #12
    Carolla's Avatar
    Carolla is offline Senior Member
    Real Name
    Carol
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    Phals, Catts, Onc. Alliance
    Join Date
    Dec 2012
    Gender
    Female
    Location
    Eastern WA State, USA
    Posts
    1,432

    Default

    I was curious about that statement, Geoff, so I looked online. According to Michigan State University ( http://www.hrt.msu.edu/faculty/Runkl...sis_Part_2.pdf ) the following is the case:

    "Phalaenopsis roots that are ex-posed to light have chloroplasts and perform photosynthesis. A majority of phalaenopsis growers in Taiwan and the Netherlands, and increasingly growers in the United States, use clear pots that allow light to penetrate the pots. Root photosynthesis likely contributes little to total plant photosynthesis. However, because phalaenopsis roots avoid darkness, roots of plants grown in clear pots generally stay inside the pot better than the roots of plants grown in opaque pots."

    Perhaps orchids, being epiphytes, have abnormal roots? I'm not the expert, I have heard from many I consider experts that Phals can photosynthesize in their roots. I consider you an expert too though.

  3. #13
    SusanLee is offline Member
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Phalaenopsis for now
    Join Date
    Aug 2015
    Gender
    Female
    Location
    Renton, WA
    Posts
    37
    Member's Country Flag

    Default

    Photo synthesizing makes sense to me. And the orchids I have respond well to having their roots exposed. Aren't phals epiphytes? I have started treating them like that and they seem to like it. I just got a new nook with a camera so want to get a pic of the phal that started this thread...

  4. #14
    SusanLee is offline Member
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Phalaenopsis for now
    Join Date
    Aug 2015
    Gender
    Female
    Location
    Renton, WA
    Posts
    37
    Member's Country Flag

    Default

    Once I found out that phals are epiphytes I began treating them much differehtly, with attention paid to their roots, especially those in the air. They seem to be doing well and I have let those air roots be and they seem to love the light. In time I'm sure they'll let me know if they like the light and photosynthesis abilities it presents

  5. #15
    eorchids's Avatar
    eorchids is offline Senior Member
    Real Name
    Eric
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya, Laelia, Phalaenopsis
    Join Date
    Sep 2011
    Gender
    Male
    Location
    Orléans, France
    Posts
    1,871
    Member's Country Flag

    Default

    Quote Originally Posted by SusanLee View Post
    the upper side of the leaf is dark green, the underside is dark purple-red, uniformly across the entire length of each leaf. New leaves have this same coloration.
    Some Phal. species, maybe in the parentage / ancestry of your Phal., have leaves like that, particularly Phal. sanderiana.
    1 Upper side 2 Under side

    Name:  Sand 1 recto Sand 2 verso 2.JPG
Views: 141
Size:  190.2 KB
    Last edited by eorchids; December 31st, 2015 at 12:30 PM. Reason: correction of a wrong word

  6. #16
    SusanLee is offline Member
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Phalaenopsis for now
    Join Date
    Aug 2015
    Gender
    Female
    Location
    Renton, WA
    Posts
    37
    Member's Country Flag

    Default

    They are that color, yes. I have two, one has wrinkled leaves like the one pictured, leaves are smooth on other. What does "ascendancy" mean? Great thread going on here . Thanks and Happy New Year to everyone!

  7. #17
    Carolla's Avatar
    Carolla is offline Senior Member
    Real Name
    Carol
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    Phals, Catts, Onc. Alliance
    Join Date
    Dec 2012
    Gender
    Female
    Location
    Eastern WA State, USA
    Posts
    1,432

    Default

    Wrinkled leaves means that the plant is not getting enough water. It could be not watered often enough, or that the roots have suffered damage from too much water, broken down media or the wrong media. When the plant gets enough water later, the badly wrinkled leaves do not plump up, but it will grow new ones that are happy (over time) and lose the older sad ones.

    Here are two pictures of the same plant, one when a friend gave it to me after his wife underwatered it and one a couple of years later with new leaves.
    Attached Images Attached Images   

  8. #18
    eorchids's Avatar
    eorchids is offline Senior Member
    Real Name
    Eric
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya, Laelia, Phalaenopsis
    Join Date
    Sep 2011
    Gender
    Male
    Location
    Orléans, France
    Posts
    1,871
    Member's Country Flag

    Default

    I'm sorry. I used a wrong word, I suppose.
    "maybe in the parentage / ancestry of your Phal.", is better I hope.

  9. #19
    SusanLee is offline Member
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Phalaenopsis for now
    Join Date
    Aug 2015
    Gender
    Female
    Location
    Renton, WA
    Posts
    37
    Member's Country Flag

    Default

    Very nice rescue job! I recently brought one home that had been forgotten in a corner and had droopy dessicated leaves. It's leaves have regained their stiffness and it is growing a new leaf

    ---------- Post Merged at 08:57 PM ----------

    I figured that's what you meant. It's nice time have a sub species name, thanks

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Phal Dry stem but green leaves??
    By Benitezn09 in forum Phalaenopsis ('moth orchid') Information
    Replies: 9
    Last Post: October 15th, 2011, 03:47 AM
  2. Help! Top Green Leaves Falling off Phal Orchid...
    By dulce in forum Orchid Ailments / The Compost Pile
    Replies: 7
    Last Post: October 2nd, 2010, 10:42 PM
  3. Dark Green Leaves on my Phalaenopsis Orchid
    By baytownboy in forum Phalaenopsis ('moth orchid') Information
    Replies: 3
    Last Post: December 8th, 2009, 04:22 PM
  4. Phalaenopsis - Dark Green Leathery Leaves
    By juneeb in forum Phalaenopsis ('moth orchid') Information
    Replies: 2
    Last Post: September 14th, 2009, 08:40 PM
  5. Phal - Yellow Leaves & very green medium
    By Lex3414 in forum Orchid Ailments / The Compost Pile
    Replies: 8
    Last Post: May 7th, 2008, 10:26 AM

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.