In the page's words:

Oasis in the city? Suits you! Relaxing in the green? Suits you!
And your own bottle garden? Totally suits you!
Join the free workshop at the Rausgegangen Festival and learn from our expert, Elmar Kutsche from Heile Welt Flaschengärten, how to create your own mini garden with the right materials and plants: A closed ecosystem in a jar where plants can thrive for years without much intervention.
Guaranteed to succeed even without a green thumb. That's a promise!