To find out how much Leslie spent on the grass seed, you can multiply the weight of the grass seed by the cost per pound.
The calculation is as follows:
\[ \text{Total cost} = \text{Weight (in pounds)} \times \text{Cost per pound} \] \[ \text{Total cost} = 4.5 , \text{pounds} \times 1.22 , \text{dollars per pound} \] \[ \text{Total cost} = 5.49 , \text{dollars} \]
Therefore, Leslie spent $5.49 on the grass seed.