I don't know the garden stuff

but could seed not plant be interpreted as keyword spamming?

What if you started your titles with sdomething like

Seeds for "totally awesome looking purple flower"    (I forgot the name, sorry, but WOW! If I was a bee, I'd wanna marry that plant!)

or Seeds to grow.....

and then

Mature "purple plant"

or whatever the correct terminology is?

........................

also, seen this with a lady struggling with paper pattern listings, her gallery picture was showing a pic of the finished garment and customers were buying her item expecting the finished item.

I'm wondering if you need to have a picture 9of the seeds in your gallery picture?

I know, a picture of seeds just doesn't do that amazing plant justice, but it may go some way towards convincing eBay to leave you alone?