First find the number of sage leaves Sabrina needs: 12 basil / 2 basil/sage = <<12/2=6>>6 sage
Then add 5 to find the total number of verbena leaves she needs: 6 sage + 5 = <<6+5=11>>11 verbena
Finally, add up all the different leaves to find the total number: 6 sage + 11 verbena + 12 basil = <<6+11+12=29>>29 leaves
#### 29