A pedestal for flowers or vegetables on which a glass dome can be fitted. Most vases put up side down will work just fine.
There are air ventialtion holes for circulation but it still gets moist fast inside the dome.
Also added a .stl file for the dome as well if someone wants to try to print it in clear plastic.
Cred to BigBadBison for original flower pot design: http://www.thingiverse.com/thing:406847
Printed up side down at 200 µ.
No support needed