I am making a wedding cake with dripping chocolate ganache and rose petals.
The cakes are to large to refrigerate after I finish. Can I leave ganache
covered cakes out for 24hrs?
Is there a better chocolate to use?

Hi, you certainly can keep ganached cake out unless the fillings that you have used need refrigeration. As far as I know you can keep ganache out at least 3days.

Don't all ganache recipes include cream? That would mean refrigeration then, I would think? I would love to hear what people have to say. Perhaps not!

The ganache I've used, which uses butter and cream, will melt if you leave it out (lesson learned the hard way...) It may also depend on where you live. I was in Florida in the summer, so that may have been a factor.

One thing is we boli the cream and the sugar content in chocolate acts as a preservative.

If you use 1:2 or 1:3 ratio it won't melt. It will be hard but you still be able to cut nicely into the cake.

And in UK some say that you can keep ganached cake out at least for 7 days.