Have you tried posting in the sister forum, "Garden Web"? I would think you'd have more success? Otherwise, within Houzz, I'd post it in "Other" and make sure the title is catchy, so you have a better chance of getting reaponses from people who are knowledgeable about plant species.

Hi there, The gardenweb forums are not yet available through the app, however if you access the site using the browser on your device, you will have full access to all the plant forums there. Hope that helps!

Any plans to add gardenweb, such as "name that plant" to the app?

Yep. Eventually, the gardenweb forums will be fully integrated.