Workers garden Friday at the Miyawaki forest in North Cambridge’s Danehy Park, as seen in a resident photo.

The Miyawaki forest at Danehy Park got an intervention Friday – something that wasn’t supposed to be necessary at an innovative patch of greenery planted four years ago to be “self-sustaining.”

Workers came to the park in North Cambridge and removed a dozen trees, planted 20, cut back sod and weeds around the forest perimeter and put in place a mulch ring to reduce weed infiltration and competition, said Alexandra Ionescu of Biodiversity for a Livable Climate, in an emailed reply to media and resident concerns. The nonprofit, also called Bio4climate, partnered with the city of Cambridge and the Sugi Project, a San Francisco forestry nonprofit, in a Sept. 25, 2021, planting in Dan

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