Chlorosis in Crape Myrtles
I purchased 3 Crape Myrtles and planted them about 6-8 weeks ago...into clay soil, but I dug my hole a bit bigger and amended with some composted horse manure and rich garden soil, etc. They're mulched with shredded cypress mulch.
I've watered them just about every day since then because of the extreme heat. They are all approximately 3 feet tall.
Of the three, 2 of them began putting out new growth pretty quickly. Within a month or so, they'd also bloomed. #3 plant has full morning sun, with a little bit of shade in the afternoon. #2 plant has full morning sun with a bit more dappled shade in the afternoon. It's #1 plant I'm a teensy bit concerned about.
This plant has not quite as much full sun in the morning - I'd say it's bright, but dappled. It also had a bit more afternoon shade, so I trimmed back a few branches of the rogue "tree" on my fence line to the west of it and now it's brighter in the afternoon, with some direct dappled sun. It did start putting out new growth at the same time as the others, but I soon noticed that that growth was not as deep crimson as the other two, and that the other older foliage was starting to show signs of veining and outright yellowish coloration. It has not made any attempt to bloom.
So...I got some chelated iron, followed the instructions and watered it in well afterward. That was on Tuesday. My questions are: How soon will I be able to tell if this is making a difference? Is there something else I may be missing?