Dear Sir/Madam,
I am very familiar with this kind of jobs. During my web developement activity I have faced various issues in various domain. The solution I found for your problem is next:
I will build a custom plug-in for your wordpress in order to register a new post type named "Plant" (can have any name). If you want I can register a new taxonomy in order to better categorize your "Plants" post type, or use existing default categories. Using the plugin I have the possibility to better customize your admin page that edits the post type. The next step will be building a template for this post type in order to design the page.
I found the plug-in solution as being the best because you can clearly see the work I am doing for you and also to not alter the existing files of your website (e.g. [login to view URL] from theme).
If you are interested in the solution I found, I will be honored to accomplish your needs.
Greetings,
VLAD Mihail-Alexandru