I've tried looking online and it's driving me crazy that I can't find answers so please can you help me? I live in Western Pennsylvania if that helps.
#1 Cornus florida, a pink-flowered cultivar (they are usually white, but pink ones do occur) #2 Don't know #3 Something in the family Malvaceae (not sure which of several similar genera)
I believe #3 is Hibiscus syriacus, Rose of Sharon, as seen here: http://www.hiltonpond.org/ThisWeek040622.html