Unity terrain grass is not working properly

As shown in the image, these rectangular and opaque sprites were meant to be
to an image of a flower. In the image the flower is correctly configured,
transparent at the edges, a little on the inside, and a good resolution. Although
when I use terrain grass and put the flower texture the image comes out
completely opaque and rectangular. I’ve tested with other images, other modes (sprite 2d, default …),
but nothing worked.

Set grass material to cutout. Its not images render, but materials. Should be name just like your png image, say, flowers.mat