1. Not trimming
The biggest reason men should trim their beards during the growth process is because not all hair grows at the same rate. Everybody, including myself, experiences uneven beard growth at some point and it's highly recommended that you take care of it early on in the growth process. Otherwise, it may be harder to fix in the future.
Also, beards have become very trendy in the 2000's and many of the best styles requires regular trimming.
2. Not shampooing
Like regular hair, beards should be shampooed in order to remove oil, sweat, and product build-up. It is important not to overdo it, though, or you may strip the hair of its natural oils. 3-5 washes per week is ideal.
It is also important that you do not air dry because the hair will be drawing out moisture from your skin, which will dry it out and made it flaky.
Applying beard oil to your beard after your shower is the best way to seal in the moisture.
3. Not shaping
This goes along with not trimming. Most beards should be shaped at least a little because even if you want to have an all-natural looking beard, it most likely look and feel better with a good shape. Consider your hairstyle. Wouldn't it look pretty boring if it was all one length? The same logic applies to your beard.
4. Not having a complimentary hairstyle
While we're not saying that you should run out and get the trendiest hairstyle that's out there, a good complimentary style will only enhance the awesomeness of your beard.
5. Not having patience
While we all want to have the thickest, longest beard as quickly as possible, it's important to remember that everyone is different and that every beard grows at different rates. It could take you a month to grow the same length your friend grew in a week. And that's okay. What's important is how well you keep your beard maintained at every stage of growth.
Age is also a factor. Many men in their early 20's may find it difficult to get much growth at all but will usually have little trouble growing a full beard later when they're in their 30's.
When it comes to growing a beard, quality is definitely better than quantity. By keeping your beard trimmed, clean, and healthy, it will look great no matter where you are in the growth process.