You are designing a rectangular garden, and you want to create a scale model to plan your layout. The actual garden length measures 20 meters to the model's 6 meters. The actual garden has a width of 12 meters. If you want the height of your model to represent the actual width of the garden, what should be the width of your scale model garden?

The scale ratio between the actual garden length and the model's length is 20 meters to 6 meters, or 20:6 which simplifies to 10:3.

To find the width of the scale model garden, we can use the same ratio. Since the actual garden's width measures 12 meters, the width of the model garden would be 12 * (3/10) = 36/10 = <<12*(3/10)=3.6>>3.6 meters.

Therefore, the width of the scale model garden should be 3.6 meters.