The Water Conservation Garden in Rancho San Diego will keep blossoming with the financial backing of the Helix Water District after board members with the district agreed to continue its annual contribution. Helix has been an active partner with the not-for-profit garden since its founding in 1999. The district’s annual contract with the group was set to expire at the end of this month. Nearly 20 years ago, Helix and other agencies formed a joint powers agreement to operate the six-acre garden. Those agencies include the city of San Diego, the San Diego County Water Authority and Otay Water District.