Please how do I register a company that is involve in landscaping and horticulture.
Please I need help I just want to know the process

You may register it as business name (cheaper option) or limited liability ("Ltd" which is a bit more costly).
You need to come up with two names for the business to be submitted to the Corporate Affairs Commission for availability check. One name will be approved if it is not in existence already. After which you can then proceeded with registration proper. It usually takes few days to get your certificate, all things being equal.