Post by rainforest on Jul 24, 2008 7:14:30 GMT -10
It appears to me that the media has broken down and has become too acidic. Roots are probably few and fragile and a basic step up is needed.
Would you be interested in using one of your plants as a test example for one of my theories? On that one, add a hand full of coral chips (is that available to you?) if not lime stone chips will work. Add this to the surface and just continue to water, fertilize and treat as you would normally. Results should be seen in a few weeks. Please keep us abreast to your development. But you must treat it the same as you would if you had never changed anything.
@francois, yes they are mirabilis, viking and rowanae
Michael, thanks for pointing out, will do that on one of the plant, will search for coral chips or lime stone over this weekend. (Just noticed on your post in basic media ;D, showing the coral chips - no need picture anymore, thanks)
Just curious if there was an update on this. What actions did you take and what were the results? Also if you could mention what your potting mix is here and what kind of water and fertilizers you use.
Sorry for didn't gave the update, was quite busy lately. Ok, for the update: rowanae eventually dead, some of mirabilis also dead and some still in the same yellowing stage struggling, two of globosa still survive and started to grow green leaf.
Treatment was change of media from last time was using burnt husk rice + coco peat to a mixed of pine bark, coco chips, perlite, charcoal, chopped spaghnum, peat moss & pumice.
Fertilizer: using the growmore, peters, schultz 20-20-20 & 10-55-10 & some seaweed base fertilizer using at light dose once a week alternately.
Thanks for the update. I have had N. mirabilis and the other occasional lowlander do this too me in the past as well. So it sounds like there was no drastic turn around which would lead me to believe it is caused by something other than the potting mix or some sort of mineral defficiency. It looks so much like a nutrition problem though. Perhaps something environmental blocking the plant from absorbing the proper minerals?
I did some browsing on what causing this, I think it is called "chlorosis" roots unable to absorb nutrients, hence making the leaf yellowing.
As for the cause, I suspect of the paint chemical, it occured when I had a repainting closed by to my growing area, the old paint was being scrapped off the wall, some debris might landed on the media that creating the problem. Cindy @singapore got the same yellowing leaf and also noticed her apartment being refurbished at that time.
But only occuring on my mirabilis, rowanae, globosa and their hybrid but no harm to other species or hybrids.