I was wondering if anyone could help with advice regarding planting lilac plant/bushes this late in the season. My sister showed up with a small package of 5 lilac plants. They are just one "stick" each with a few leaves on them. I know that I need a site with good drainage. The ground isn't frozen here yet. I'm worried that the plants roots will freeze from the cold, and the plants will die. Any help is greatly appreciated. I'm in zone 6. My plan is as follows.

I'm going to plant according to directions in soil with good drainage, water the heck out of em, and then surround the base with hay to try and insulate.

Cheers...