As It'll be exposed to the elements during the Winter season (NW Indiana), I used to be pondering planting 1 Asclepias syriaca and one Asclepias verticillata in it towards the center. Does this idea sound possible? Many thanks i are in indiana And that i are eyeing some tropical milkweed http://chancemvcin.fireblogz.com/12992669/the-ultimate-guide-to-weed-seeds-jacksonville-beach