I don't know if this should go on profiles, or be a form a person can fill out when adding a plant to the database/adding comments to a plant in the database.
When I go to newegg.com and read user reviews on products, or rate a product myself, I can see how long the reviewer has owned the product, and what level of tech expertise the reviewer considers him/herself to be. Rating the product myself, I'm given a drop-down box to select how long I've owned the product, or what level of tech expertise I consider myself to have.
I think it would be nice when reading someone's comments about a plant to know how long that person has been growing that plant, and what they consider their level of gardening expertise or expertise re: that plant to be.
NO clue how you could make that happen, but I think it would be really nice.