Hey, wait a minute, this is Charlie Brown's baseball field. That's his pitching mound. You can't plant here.

6 seconds sound clip from the It's Arbor Day, Charlie Brown movie soundboard.

You can hear this line at 00:08:04.796 in the DVD version of the movie.

Quote context

[...]

- Good grief!

- Every child should plant an orchard, a flower garden.

- Let us on to the field and cultivate a few forest trees.

- Not a bad idea.

- Right here is a good place. Plenty of room. A lot of dirt is...

- Hey, wait a minute, this is Charlie Brown's baseball field. That's his pitching mound. You can't plant here.

- Au contraire, here is just the place. There's lots of room here. We might just as well put it to good use.

- Shouldn't we ask Charlie Brown first?

- Nonsense. He should be happy we're fixing up his old field.

- Sally, you and Snoopy start planting.

[...]