I ordered odorata and Parma 'Marie Louise'. They've arrived. Now what do I do with them?

My impulse is to plant the 'odorata' under a tree in the backyard and let it spread wherever it wants.

But what about 'Marie Louise'?

Thanks for any advice!

That's definitively a good idea to give violets a try ;o)
About odorata under a tree: better not a conifer and pay attention there's enough sun :-) During spring time, the more they'll have sun, the more they'll make blooms.
About Marie-Louise: a pot :-))
Anyway, don't put them together.
Really hope you will sucess, but don't worry too much, there's no reason why you shouldn't, odorata is so easy :-)

All the best :-)
Thierry.