The gnome can have up to two points in one ability score and an additional point in another ability. Or it can have one point in all 3.

You have advantage on poison saving throws and are resistant to poison damage
You don't need to eat, drink, or breathe
You are immune to disease
You don't need sleep and magic can't put you to sleep

The garden gnome race has natural armor of AC 11 plus dexterity modifier

When you are in natural terrain (such as a garden, forest, or grassy area), you can use your bonus action to blend into the surroundings, gaining advantage on Stealth checks to hide. Additionally, creatures have disadvantage on Wisdom (Perception) checks to detect you while you are fully within this terrain.