[Floor or grass/no floor!!]

Hi all, 

First time trader here. I'm trying to think of everything I may need for the stall. One thing I can not decide on is whether I need any kind of 'floor' !!

Will leaving just the grass look unfinished and untidy or just fine? 

Hard to imagine without bring there, when of course it would be too late....

So if anybody has any insight/tips??

Thanks