Whose grass does Gatsby want cut?

Gatsby wants to have Nick's grass cut (he has hired someone for the task) because he is meeting Daisy at Nick's home. He wants everything to look perfect.

“I talked with Miss Baker,” I said after a moment. “I’m going to call up Daisy to-morrow and invite her over here to tea.”
“Oh, that’s all right,” he said carelessly. “I don’t want to put you to any trouble.”
“What day would suit you?”
“What day would suit you?” he corrected me quickly. “I don’t want to put you to any trouble, you see.”
“How about the day after to-morrow?” He considered for a moment. Then, with reluctance:
“I want to get the grass cut,” he said.
We both looked at the grass — there was a sharp line where my ragged lawn ended and the darker, well-kept expanse of his began. I suspected that he meant my grass.