The Greenhouse of Walled Lake is teaming up with UBaked Cannabis Company to offer free pre-rolled joints to people who have received a COVID-19 vaccine and can prove it. WALLED LAKE, Mich. – The Greenhouse of Walled Lake is teaming up with UBaked Cannabis Company to offer free pre-rolled joints to people who have received a COVID-19 vaccine and can prove it. The “pot for shots” COVID-19 vaccination promotion runs from Jan. 22 through Feb. 28. You need to bring in written proof that you’ve received a COVID-19 vaccine and you’ll be given a free pre-rolled joint with no purchase necessary. Jerry Millen, Founder and owner of GreenhouseThe Greenhouse of Walled Lake is located at 103 East Walled Lake Drive in Walled Lake, Michigan.