I'm glad that these people exist but on the other hand It's hard to imagine what they do in everyday life that this topic is so interesting to them, that they want to feel this responsibility for the plant.
Communities can form around the weirdest of things, and when they do, social ties keep the original reason going.
That's a beautifully succinct explanation of the Internet.
They've also done a lot to enrich the whole community. The daily plant gifs and a monthly voting graphic overview post have been put together by folks in the community.
How did you end up getting people interested/wanting to participate? I feel like that's the biggest hurdle.