CANNABIS CULTURE -  Pioneer medical cannabis grower gives away coconut coir waste as a soil supplement for healthy vegetable gardens in poor townships. “We call it closing circles,” Dina Zollman, project manager of MedCan, tells Cannabis Culture of her company’s work in blooming township communal vegetable gardens.  MedCan is one of the first and only fully indoor licensed medical cannabis cultivators in South Africa. Their unique product, Isando, says Zollman, is grown, dried, hand trimmed,…