Gita, I looked at your questions and saw some things I missed. Your plant pictures get approved by a monitor and it isn't a set time, different monitors look at different plants so they get to them when they can. Usually pretty quickly but sometimes a little longer.
If you page down on the ask a question forum, there is a place for you to ask toward the bottom of the page.
Also if you page down to the bottom of any page, in the blue, it has acorns in the mix of things there. If you click on that it will also tell you about acorns
The monitors award the acorns and you will be notified when you get one.