Sorry, I just cannot contain my enthusiasm for using homegrown hops for bittering, so here's more:
I really don't understand why most homebrewers are afraid to try their homegrown hops for bittering. In my experience, bittering is truly the very best use for them. And people have been boiling whole hop cones for hundreds of years without having any idea what an "alpha acid" even is. No one should ever feel discouraged from using them for bittering. Seriously. Sure, you have to guess on alpha initially if you care about IBU precision, but after just one or two uses, you'll know exactly what you've got based on taste, and then in future years, they'll be pretty much the same every year.
I strongly encourage everyone to try their homegrowns for bittering. Please do, and enjoy.