I have zero experience with gardens or plants but I'm going to close on a
house soon which has a rather steep embankment not very far from one part of
the house. I want to make sure that the embankment doesn't erode, and I've
read that the common orange daylily is ideal for this task because of its
root structure, toughness and ability to propogate.

The only problem is: I can't find any common orange daylilies. I just went
to a pretty large garden store and they had a bunch of hybrid daylilies, but
no common oranges.
Can anyone tell me specifically where I can find these daylilies? I live in
Mississippi but would be willing to order online.

Also, the slope in question has some medium-sized oak trees on it (which may
mean I'm being overly worried about erosion- the trees may help prevent it
alone- is that correct?) so it will be a semi-shaded condition- will the
common orange daylily thrive in this condition? I read somewhere that it
will- it just won't flower as nicely and all I really care about is erosion
control.

But first I need to find these plants- any suggestion for finding them?
Thanks in advance.

Robert