It doesn't just grow when you are 15. You will continue to grow overall until possibly 17 or 18. This should include your penis also. Everyone is different and we all get what we get.
Yes, the penis makes its most dramatic increase in size during puberty.
It will grow, yes. But not rapidly, it may take months or years, and won't happen overnight!
puberty
You will have to wait for it to grow during puberty naturally.
Overall penis length grows the most during puberty, commonly starting at age 8-12.
Your testicles start to grow quicker during puberty and the scrotum is making room for them. The penis will follow and grow quicker during puberty also along with the rest of your body. There is nothing to worry about.
Before puberty the penis doesn't grow very much at all, and there isn't anything you can do to change that. Your penis will begin to grow when you begin puberty.
When in Puberty the boys penis will grow longer and thicker.
During puberty, hair will grow around the anus and on the buttocks themselves, along with growing on the testicles, base of the penis and around it.
Normally when boys go through puberty they get hair under their arms (armpit area), they get hair around their genital area and their penis or genitals get larger. Their voice deepens and they begin to want to have sex all the time. Often they will wake up and have an erection because of dreams. All of this is normal. To answer your question, yes your penis should grow at least a little more when you start to go through puberty.
It depends. If you hit puberty early like that, then it will stop growing when you are 16 and will be around 8.5-10 inches. Nobody can say for sure. If your penis is large when you enter puberty then it will grow less during puberty. So if it is small it will grow more during puberty ! The average adult size erect is 6" so you have nothing to worry about.
The penis should grow during puberty, but some people start the stages of puberty later than others. Many boys don't complete puberty until they are 17 years old. If you feel that you have completed puberty, and your penis still has not grown, then you should contact your doctor about it to see if they can figure out what the particular problem is. There are a few conditions that may prevent the penis from growing, or can cause puberty to arrest (not complete), and you want to get those ruled out, or if treated.