Speaking outside the courtroom, Prince said the ruling was a victory.
"We have used cannabis to treat anxiety, colic in children and as an antiseptic in secret for many years", said Phephsile Maseko, of the Traditional Healers Organisation.
Cannabis is referred to as "dagga" in South Africa.
African Christian Democratic Party (ACDP) leader Reverend Kenneth Meshoe says he wants parliament to hold an urgent debate following the Constitutional Court's ruling today that it is legal to cultivate and consume cannabis at home for personal use.
In Malawi, marijuana remains illegal.
Lionel Messi, Ousmane Dembele Score Stunning Goals In Barcelona Vs. PSV
Here's to lots more Messi magic in the Champions League this season. Messi scored the opener with a brilliant free-kick.
It found that the country's cannabis ban infringed on section 14 of the South African constitution which gives all citizens the right to privacy.
The breakthrough for South African cannabis users came just a day after United States soft drinks giant Coca-Cola confirmed it was studying the use of a key ingredient in marijuana to make "wellness beverages".
The court has not approved - in any form - the trade in marijuana, meaning the government will not be able to profit from taxing a legalised industry.
The court did not specify the quantity of cannabis a person can grow or use in private.
Deputy Chief Justice Raymond Zondo handed down the judgement, which confirmed that sections 4 (b) and 5 (b) of the Drugs and Drugs Trafficking read in part with section 22 (A)(9)(a)(i) of the Medicines and Related Substances Control Act were constitutionally invalid.
Parliament would have to decide on this, it said.