How do you delete a garden plot on Sims 2?

I built a garden on Sims 2 and now I want to rearrange it. I’ve harvested all my veggies and I haven’t fertilized the dirt yet so I just want to move it or delete it but it says ‘can’t pick up’. How can I move/delete/put grass over it so I can rearrange my garden?

Thanks!

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