Feature a permanent botanicals section on your website - You can't sell it if you don't show it!
Talk the talk - Use a recognizable term (hint: your customers don't know what permanent botanicals are!) If you aren't sure, check the websites of the major retailers where your customers are shopping for home décor items. A recent tour of major retailer website found the terms "Faux Florals" and "Artificial Florals" as the top references.
Watch the trends and design for them - For example, with more individuals working from home, home office décor is skyrocketing. Advertise permanent botanical floral arrangements, floor plants, trees, greenery shelves, even floral and greenery walls for this.
Use contextual photos to help customers visualize - show the arrangements in a home, in an office, in a restaurant. You would be amazed at how easy it is to set this up in your own home or shop, or a near by restaurant.
Don't just market on one channel - Set up a home vignette in your shop, post on your website, show it on social media, use direct mail. Consistency and repetition is key!