Hi,
I currently have five michelia albas. They are all fertilized with a coconut husk-based organic fertilizer and are watered whenever dry. They seem to be happy with this treatment but it seems three out of five are currently showing signs of chlorosis. They are essentially in the same soil type in my front yard which is somewhat loamy with little amounts of clay.
My michelia alba #1 (the oldest), used to be chlorotic more than a year ago when it was much smaller. However, this year, its chlorosis disappeared without any special treatment other than the regular watering and fertilizing with the fertilizer mentioned.
My michelia alba #2 is planted near my mango tree. It is chlorotic but my mango tree (over 5 years old) near it is quite healthy and not chlorotic at all.
Here's another photo of my michelia albas 1 & 2 showing their relative location to each other:
My michelia albas #3 and #4 are both chlorotic with #3 as the most chlorotic of the five:
Michelia alba #4:
My michelia alba #5 is very healthy and never experienced any chlorosis.
My question is, do I need to treat the chlorosis or shall I just let them grow bigger so they overcome the chlorosis like what happened to my michelia alba #1?
I'm wary of treatments/soil ammendements because these plants are what is like 'gardenias' to most of you. I lost one even though it was already big (5 ft tall) due to soil ammendments (adding chemical fertilizer and iron compounds) which I did to treat its chlorosis. (I also probably overwatered it... They seem to be VERY sensitive to overwatering; a lot more sensitive than my gardenias.)
So back to the question... Should I leave them as is, or should I try ammending the soil again (and risk losing them). What 'safe' soil ammendments would you recommend for such plants?
Thanks in advance.
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By the way, I'm planning on adding more michelia albas. I'm hopelessly in love with their extremely sweet, captivating, intoxicating, addictive, heavenly, 'to die for' scent. I just can't get enough of them! I suspect they have some 'addictive' component in their fragrance, or it is just probably my nose. :)
They are really quite a bargain here: only 1,500 pesos for a 5-ft tall grafted plant in bloom (about USD$31 based on the current peso-dollar exchange rate.)
tropical
jimshy