A medical marijuana collective in Woodacre says it produces plants with with THC levels below those of 50 years ago and much higher healing properties. David Briggs

Synergy Wellness’s medical marijuana farm is tucked away in a leafy corner of Woodacre. Healthy cannabis plants bask in the afternoon sun on the property’s back deck, but most of the operation is carried out inside a specially-built grow house. Sequestered in a long windowless room, the 50-some plants are currently in their “vegetative” or . . .

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