Hidden in Gnome sight

Gnomes are nimble and deceptive, to the point that humans may occasionally make clay sculptures of these tiny folk, with red hats, large bellies and white beards, some gnomes match these descriptions and use them to their advantage. 
When in a garden, forest, or feywild, you have a choice between 2 effects if hiding in said enviroments.
When hiding, you can choose to either add advantage to a stealth roll while in the garden, or roll a 2d4 to add to a dexterity check for one hour.