Ma 'Green Fingers' Mahaffy was a bio-criminal in Mega-City One.
Here is what Judge Dredd: The board game has to say about her:
Brainblooms grow like flowers but can imitate any sound - a result of a bio-organic graft of plant and human. Banned because of what they are fed on, even their possession carries a severe penalty. Ma Mahaffy, the notorious bio-criminal still active despite her 100 years, grew them in her roof-garden. Judge Dredd discovered her plot, but Ma used her brainblooms to hypnotise him to kill himself. Dredd overcame the spell and used riot foam to smother the plants' evil chorus.