Activity for dawn

So I'm super interested in using baby's breath for part of my center pieces and also ceremony decorations. I was wondering if anyone has used it before, how long does it usually keep and does it run fairly inexpensive (I'm only assuming that because...

I know it's called a backyard wedding, but has anyone ever done it actually in their backyard? My FH wants a big wedding and invite everyone, but I'm more of a small backyard kinda person and I was trying to think of different colors and decorations...