I have had my little banana plant for 1 month now. The first new leaf it sent up was uniformly green after exposure to the light. The second leaf was more pale, even yellow near the base, and it has tiny dark green spots scattered irregularly along the veins.
I've been seeing a very similar pattern in one of my cycas revoluta also. All my cycads get the same treatment, I don't understand the one tiny plant with the pale leaves.
There is an online plant nutrient deficiency diagnosis site at
http://hort.ifas.ufl.edu/nutdef/decision.htm
which is nice. According to them, The most likely problem is low iron, with low sulfur or low manganese being second choices.
The plant is a little over 1 foot high, has 5 leaves now, and is in an 8" pot with a high organic soil & good drainage (unchanged from how I bought it.)
I've been fertilizing the banana with some Miracid 30-10-10, liquid kelp extract, humates, and some fish emulsion. Similar to my cycads.
The liquid kelp extract has a remarkable list of trace elements. My own tests have shown improved growth for plants given this extract. I'd be surprised if minerals were lacking.
Has anyone seen this kind of coloration and what did you do about it?
Thanks.