This planter was inspired by dontbekoi's oddish http://www.thingiverse.com/thing:738011
Except that one is printable without any supports and has a crooked bottom so that the water drains out, just like lordvoldemort's Bulbadrain http://www.thingiverse.com/thing:426645
There are two sizes available : one that has an approximate outer diameter of 9cm and another of 15cm.
EDIT 31/05/2016 : You don't have to but if you download it from here
http://www.3dupndown.com/mypage/?pcode=cont_view&mtype=au&idx=5262
I get a little money while your download remains free.
Enjoy !