My vietnamese coriander has yellow leaves. I put some fish emulsion on it to increase nitrogen. I also used some ironite to increase acidity. Any other ideas to what the problem might be? Will post a picture later.
Vietnamese Coriander (Polygonum odoratum)
chlorosis or yellowing leaves is caused by a lack of iron or magnesium. clorosis starts from the bottom leaves on upwards, its lack of magnesium, when it begin at the top, its lack of iron.
Both a too low or a too high ph-value of the soil can cause a malnutrition of the two minors even though, you feed with a good fertilizer.
The stunted top growth of the plant could be caused also by malnutrition but also from broad mites.
when plants are sick, fertilizing is not the solution.
personally i do not use ironite. if u do not yet, pls read link http://www.dirtdoctor.com/view_question.php?id=120
use Epsom salt instead http://www.epsomsaltcouncil.org/garden_benefits.htm - it is organic
it has been my habit to research a product before i use it. hth ... ma vie
MaVie, thanks for the reply. It does look like it's starting at the top and working downward. So it must be lack of magnesium. I'll look at the leaves closer to see if I see any broad mites.
Personally I do consider myself organic. I thought ironite was an organic product plus I have about 5lbs of it that I need to use up. Thanks for the links. I plan on reading them after posting this.
I also read on another site that this is a swamp plant. Sometimes the plant can be suceseptable to a fungus and should be watered from below the leaves.
This message was edited Jun 12, 2008 12:15 PM
here's a picture...
personally i have not grown Vietnamese coriander or rau ram . therefore, i do not have any personal experience or knowledge to share. here is a link that describes different Asian herb http://www.vietworldkitchen.com/essentials/herbs.htm
check this link http://davesgarden.com/community/forums/t/687163/ i have describe the different herb relating to coriander. it is on the Herb forum as sticky. scroll down to Post #3151783, hopefully there are more info there for u.
organic or not, personally i will not use Ironite in areas where edibles are planted. presence of lead and arsenic accdg to the link above surely frightens me. from what i read during researches done long time ago, ironite is definitely poisonous! if i can't eat it, i will not serve it to my family either.
Ironite is heavily used in lawn and golf areas, not in area where there are edible plant. if u do further research on ironite, most info refers to using ironite in lawns. here is another link re: ironite http://www.envirolaw.org/poison.html hth.
Thanks for the links. My wife is vietnamese and likes the herb that's why I was asking. She likes using it for chicken dishes. After reading the articles you posted I feel I should no longer use the Ironite.
Here's a picture it has greened up very well. I don't know if it was the Ironite or the Epsom Salt though.
