Napa

Take Highway #12 / 121 towards Petaluma.
At Big Bend, where Highways #12 and #121 split off into Highways #116 and #121, turn right onto Highway #116.
Stay on Highway #116 right into Petaluma. There is a confusing point on this road and it is right after you come out of the hills, a couple of miles past the county dump. As Highway #116 make a 90 degree turn to the right, there is another turnoff to the left, and there is usually a sign saying 'To Petaluma'. Do not take this road! It will eventually take you to Petaluma, however, it is a long and twisty route.
Stay on Highway #116 for several more miles, and it will connect with Lakeville Highway. (Turn right at this intersection.)
In approximately one mile, you will go under Highway #101.
At the fourth traffic light, after you have gone under highway #101, turn left. (This is East Washington Street, and you will be heading west towards Bodega Bay.)
The nursery is approximately 4 miles further.
As you exit Petaluma proper, East Washington Street will change names and become Bodega Avenue.
The nursery address is 5010 Bodega Avenue, and is on the right side of the road, between Skillman and King roads.