I was re-reading previous posts on Renanthera and the discussion
wandered into watering aerial roots. Several people mentioned roots
turning green.
I have noticed that some of my plant's roots turn green instantly and
others take a much longer time. Some do not turn green at all.
Neostylis, Christieara and Phalaenopsis are in the former group. As
soon as water hits them the roots begin to darken. Dendrobium
biggibum, Sophronitis cernua and Laeliocattleya Little Stars only get
some green patches ( at best), even after fifteen or twenty minutes in
a bucket of water. They all look fine, making new growth and
flowering regularly.
I'm wondering if because of the low relative humidity in my
conditions, the velamen on certain plants becomes less permeable,
protecting against water loss? With the consequence of making it
harder to absorb water?
Neostylis, Lc and the Phals are potted in bark, while Den. and Soph.
are on bark mounts with a wee bit of sphagnum moss. The Christieare
is in a basket with several large chunks of bark.
I'm wondering if those of you with greenhouses also observe this
phenomenom?
What about Those of you who grow outside all year? ( I'm not angry
because you can - I'm angry because I can't! --- LOL)
Thanks for letting me share!
Bob Campoli - Philadelphia, Pa - growing plants on a windowsill.