Posted: 05/08/2014 at 20:13
I wouldn't, unless you have a free supply of lots of seeds.
There's a real danger of them being swamped by weeds. Some perennials, sown now, will germinate in spring. Weeds will germinate every day between now and spring.
and perennials are much slower than annuals, a few flower the first year from seed but most don't. that leaves more time to be swamped
If you have got plenty of seeds then throw them at the slope, some will come through