[AlexandrB]

We plant both "swamp" milkweed (Asclepias incarnata) and common milkweed (Asclepias syriaca) and the monarchs seem to vastly prefer the former for their babies. The one disadvantage, depending on how much you hate bugs, is that the swamp milkweed attracts a large variety of other polinators including various bees, flies, and some scary looking though harmless wasps[1].

[1] https://en.wikipedia.org/wiki/Sphex_ichneumoneus

[BLKNSLVR]

I've seen one of those wasps dragging a relatively large huntsman spider across the ground. Not sure if I got a photo or not. Nature at it's brutal best.

[the_sleaze_]

My son and I had an incredible time watching one devour a caterpillar whole. Ghastly. Riveting.