O.K, I want to be especially sure for newby's to Bonsai to..1) not be offended by this post..and 2) take this info in the helpful manner in which it is intended. Of late i have noticed trees being posted in the, "advice required for this tree" and the trees have no redeeming features and are very,very unhealthy. They had one theme in common, they were cheap. The reason they were cheap is because the nursery wanted to be rid of them! So, we need to learn that when buying our first pride and joy, we need to know what is a healthy tree and what is not a healthy tree. I will post a picture of a healthy tree and an unhealthy one so you can develop an eye for a potential Bonsai.
BASIC RULES.
1) the foliage must be vibrant and radiating health.
2) it must have lower branching and that branching must also be healthy.
3) it should be of a type conducive to good bonsai material e.g Maples.
These are three basic rules set in stone that must be followed to the letter. If someone more learned than myself feels they can add to this, feel free to do so. Bonsai is not about scoring a cheap tree and hopefully turning it into a showpiece, it is about developing an eye, or sense, for a potential good tree. How do i know this, i made the same mistakes and am now trying to save you some grief that i experienced.

learn and study a little before you purchase.

Than, be informed when you purchase. Please, take this information in the manner in which it is intended..benefiting the beginner.
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"Advice is rarely welcome, and the one's who need it the most welcome it the least"