What's the best green roof plant of all time?

Some cool events happening in NYC in the next few weeks including two conferences and a makers faire. The Soda Bottle Garden workshop looks great!
However a word of warning, if you're in NYC and tempted to pick some tasty treats from park property, please don't. You've been warned.

-Detroit really is the place to be for urban agriculture these days, check out all of the programs currently operating! If you're not near Detriot, there are a plethora of ways to get involved with the urban agriculture movement online, thanks to Grist we have several new websites to try out. If you want a more hands on way to learn the skills, check out Gwinett Tech next year, they'll have a sustainable urban agriculture certificate program. Maybe the second in North America???

-I've made you wait long enough. Last week research came in that lamb's ear may be able to reduce the surface of a green roof 1.5 degrees celsius. Looks like I'll have to get to know Stachys byzantina better.

-Lastly, but not...umm...leastly...a permaculture website in French! Why? Because they are so rare! As rare as finding a forager in a New York City park after today!