Can you substitute heavy cream for creme fraiche in a recipe?

I can%26#039;t find creme fraiche at any of my local grocery stores.|||sour cream is the closest thing.|||You can make creme fraiche really easily. Just put a dollop of yogurt in your heavy cream overnight. The next day it%26#039;s creme fraiche. There%26#039;s plenty of recipes available on the innernetz.|||Sour cream is a better substitute (or Greek yogurt).|||Use sour cream...