I'd say do not waste your money.

I'm assuming you're talking about something like a Pampas grass.

Remember, in zones 9-10, they have a much longer growing season than we do, so, their perennial grassees might start coming up in March.

Being that our spring is so delayed this year, I'd say you have a slim chance of the grasses being able to have time to develop the lovely seed heads.

I'd stick with something hardy here.... Try Miscanthus Silverfeather