Scott planted 6 types of trees, and he planted 9 of each type. To find the total number of trees he planted, you can multiply the number of types of trees by the number of each type:
\[ \text{Total trees} = \text{Number of types} \times \text{Number of each type} = 6 \times 9 = 54 \]
So, Scott planted a total of 54 trees in the orchard.