We'll only find out if we try it, I think. Something like "Welcome and guide to the Orchids forum" ? This way you could direct newcomers who post a new thread first to that area, and see if they follow along better.
Then, in the welcome guide, first explain that we are one of the busiest forums on the site. Then request that a new person either jump in to an existing thread, or if posting on their own new thread to stick to one thread, and not start new ones for every question. I think people don't understand that once they post their first thread and people answer them, then all those people are "watching" that thread for their continued questions, so then if they post a question on a new thread they don't get answers right away.
I think we've had several new people show up lately who are happy and comfortable with the way the forum works. Jen, Jeff, Mike and Chris come to mind. Maybe they are the ones to ask specifically?
It's too bad that Richard was sensitive about being told how to post, and also too bad that Daisy felt unwelcome but, as in most areas of life you can't please everyone, I guess.