Field variety trials are a simple but effective tool to test plant horticultural performance under different environmental conditions and enhance the commercial adoption of new cultivars. Large-scale, rapid implementation of HLB-tolerant cultivars depends on reliable data, and the Millennium Block project is addressing the need of establishing field plantings to generate regional, updated information for the Indian River Citrus District. The project has mainly two objectives: (i) Assess performance of new grapefruit cultivars with certain rootstocks under HLB endemic conditions in the IR district and (ii) ) Evaluate the influence of UFR and other recent rootstocks on grapefruit, navel, and mandarin in the IR in comparison to legacy or standard rootstocks. We are in the process of planting four independent studies at the UF/IFAS IRREC. This report is related to the grove planting operations and initial tree care since the study was recently implemented. We planted approximately 3,600 trees and are awaiting for the remaining trees to become available from the nursery. Slow release poly coated fertilizer applied and tree wraps added. We installed the irrigation controller and activated field valves making irrigation system automation fully operable. Sand media filtration and water meter were purchased and delivered. Installation was approved and is in progress. We applied imidacloprid to prevent leaf minor and psillids, and followed with a spraying schedule as suggested by the certified crop advisor. The grove has been continuously scouted for pests such as orange dogs and ants. Hoop boom was modified to spray young trees with higher accuracy, reducing the waste of agrochemical products. We created a tree location map and began production and distribution of QR tags to be used with scanner codes during data collection in the field. The group met with the certified crop advisor to develop a spray program schedule based on time of year and conditions to be applied as determined by IPM scouting. Masters student started on Jan/2020.We completed fertilizing the trees for the Spring season. Tree height, tree width in two positions (E-W and N-S) and trunk diameter were measured in three central trees trom each experimental plot. Leaf samples for HLB diagnostic were taken from a pool of trees from each experimental plot and sent to the lab. Fruit phenology started been measured in all experimental plots. A schedule of activitites for all proposed measurements was updated and implemented. We already noticed anedoctal differences in plant growth based on the scion and rootstock combinations.