Hello. I've only just started playing this game, but I realized after struggling to understand how to embed links to my plants into another website that this "visitors will help your plants grow" system only works for the forum. I think it might alienate both newer and younger players, because the forum community is not that active and younger people (at least in many English-speaking places) use things like Githubs, Strawpages, Patreons, and Rentry pages to introduce themselves. Plants shown in places like those would gain a lot more attention.
If this game were to allow any visit from any website to help the plants grow and allow those users to water plants, I believe this game would have a lot more reach. It's charming, but if it's essentially "singleplayer", I think a lot of people will be discouraged from getting invested.
My suggestion is to change it from "people who view and click on the plants in your signature will help them grow" to "people who view and click on your plants from any website will help them grow". Instead of it being forum and signature specific, I believe it'd help for it to just be "anyone who clicks on the link to your plant".
I know that it being signature specific was likely intended to encourage people to use the forum and participate in conversation... but it seems like that isn't effective anymore, and I think it'd be worth it to change and try to reach a wider audience. I genuinely think that some teenagers to people in their early 20's would find plant widgets cute, and a calm fairy theme charming. It might be an unwanted audience, so I understand if this doesn't happen, but I would be sad to see this website ever go under, so I was thinking of ways to help it stay secure. I'm sorry if this comes off too strong.