Lots of people enjoy roaming greenhouse aisles and picking out their own particular plants -- an especially attractive greenhouse may be best suited for allowing guests to enter and browse. Use online advertising like search engine optimization and a social media presence. Curate a blog where people come for entertainment, education, information, and to find new products that work for there.
Offer classes, dinners, group experiences, or other events that will draw guests to your property. Make it a memorable experience, and word of mouth will help your business grow.