Blindseer42

I thought he just disliked garlic. I'll have to look it up.

Ok. Legend has it garlic could keep evil spirits away, so once a susupected vampire was killed folks would use garlic in vairoous fasions to keep them from coming back.

https://www.vampires.com/why-do-vampires-hate-garlic/

http://www.gods-and-monsters.com/vampires-and-garlic.html

https://blog.nationalgeographic.org/2010/02/22/six-ways-to-stop-a-vampire/ National Geographic suggests the garlic aversion was inspired by rabies, since it makes victims sensitive to smell.

Garlic might not kill a vampire, but other plants may. https://en.wikipedia.org/wiki/Vampire

Why not feed him garlic flavored stakes?  Just drive it down into his heart.