Landscaping is a HUGE title. Garden walls for example are perfectly within our scope. Grading, drainage, soils, climate, weather, chemistry, siting buildings are all so very much part of landscaping. This should probably be a site unto itself. Possibly with more than asking simple questions. Plants or 'soft scapes' are but a SMALL part of landscaping. This title has got to change or we need more landscape PROFESSIONALS involved. Period.
It's like going upriver when you try and move away from the SO question and answer format. The focus for all SO sites is questions that are focused and have one correct answer.
That is not an easy fit. See this question here which has been closed as too broad. This would be a great exam question for a landscape design course. You could get a different answer from every student and they could all be right.
Landscape design does have a technical basis. Hardscaping in particular has a limited range of techniques to build something that will not fall down. This type of question fits. Design is more of an art and subject to interpretation. That's why we read about gardens designed by individuals or done in a particular style. The range of correct answers to many landscape design questions is large and not a good fit for a web site.