Garlic

Garlic is a harvest-able plant in The Sims 3 and The Sims 4: Vampires. Garlic also a known repellent for vampires.

The Sims 3
Garlic is a rare vine plant that can be harvested and bought from the grocery store.

The Sims 4: Vampires
Garlic is a uncommon plant that can be harvested to serve as cooking ingredients or made as decorations. Sims can get garlic seeds by ordering them from planters or on the computer.

Effect on Vampires
Garlic is extremely repulsive to vampires who do not have the "Garlic Immunity" power, giving them the "Garlic Induced Irritation" +1 Uncomfortable moodlet. In it's presence vampires cannot feed on Sims or drink plasma at all. When eating it vampires gain the "Grossed out by Garlic" +2 Uncomfortable moodlet. Vampires also see green pungent smells coming off of garlic where as human Sims see none, vampires still see it even after acquiring immunity.

Garlic is very helpful when Sims suffer from vampire invasions as it will stop incoming vampires from drinking your Sims plasma.

Garlic Decorations
With Level 5 in the Vampire Lore skill, Sims can craft garlic decorations that they can place within their homes to ward off vampires. Sims can make Garlic Braids, Garlic Wreaths, and Garlic Garlands. All of which gives the "Garlic Induced Irritation" moodlet to all vampires within the same room.

A house in Forgotten Hollow called the "Garliclauter Place" in which is filled with one or more garlic decorations in each room.