hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: [Aroid-l] Blanching Query

  • Subject: Re: [Aroid-l] Blanching Query
  • From: Ken Mosher ken@spatulacity.com
  • Date: Fri, 30 Jun 2006 00:30:07 -0400


The crowd I hang around with has always called this "sunburn." Moving a plant outdoors into the sun does not have to result in leaf drop (or permanent scarring or death in the case of cacti and other stem succulents) if you introduce them to ever increasing amounts of sun over a period of weeks.

Start with dappled shade, after a week or two more sun, etc. Soon enough you can have them in full sun with no ill effects. Sorry I can't give you the scientific reason why...


ted.held@us.henkel.com wrote:

Dear aroid horticulturists,

Here I am again being curious.

What is happening when an indoor plant is moved outside and experiences massive blanching? This seems pretty universal for plants, not just for aroids. If the weather is clement, new leaves will eventually appear that are hearty enough to be fully green and lush without any protection. Sometimes those leaves are smaller or more intensely green than the indoor versions. But it means the plant is capable of receiving a full dose of weather and sunlight. It is as though leaves with different endurance characteristics are produced to match a given climate situation. It does not even help if the transition is made very gradually.

I have heard before that this involves a cuticle layer that either inhibits desiccation or not depending on whether or not it is present. But the blanching I refer to does not seem to involve desiccation - except if it is so severe that the leaf dies and the desiccation is associated with necrosis. Plants kept moist and in humid conditions will still blanch.

The reverse is also true - sort of. Plants with "outside" leaves are stalled when brought indoors. Most of the time the outside leaves stay, but when new ones come on they are now of the weaker "indoor" variety. Soon enough the outside leaves fall off, apparently ill-equipped to function in the new climate.

It is not always the case that outdoor leaves die when brought inside. But it is almost always the case for the reverse.

Do we have different chlorophyll types, or internal shading or illuminating structures?

I know somebody knows the answers.

Thanks for indulging me.

Aroid-l mailing list

Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement