Study of botany, permaculture, horticulture or environmental science are all relevant to the landscaping profession. If you have experience in any of these areas or if you took a course that helped prepare you for this field, talk about what you learned. Share a highlight from your training that will help you in this job. If you know there will be some focus on building garden beds or patios, now would be a great time to talk about your carpentry experience! There are so many avenues you can go with landscaping. Someone with a broad set of skills is a perfect fit for this type of job. Review the job description to find out what the company most desires from a candidate and focus your discussion of your training on those relevant areas.