There is no need for you to get straw.
My suggestion is 撒了草籽以后直接铺上 3/4 inch of top soil.
Water as often as you can for the first month. (ground need to be muddy for
at least 2 weeks)
Water twice a week for the first season (if no rain), at least 1 inch of
water each time so roots will go deep.
