I started experimenting with this yesterday afternoon.
It's doing two things:
1) Finding the most relevant "Gardening Ideas" item that would match this plant. Ideally, the plant is mentioned in the article.
2) Find threads that mention this plant.
Now as for item #2, it works fairly solidly for most plants and I tweaked it a bit this morning.
If it is a plant type that has a specific forum (Daylilies, Roses, Tomatoes, etc) then it will only search for the cultivar name inside that forum. Otherwise, it will search for the entire name (genus, species and cultivar) in all the forums. But if there is no cultivar or species then it will not search at all.
I'm just playing around with this, but like Connie said, this is to hopefully encourage people to look around more on the site. We get a lot of visitors into the database and many of them don't know that there is more to the site than what they are seeing. I want to help them find the helpful threads and ideas.