https://doi.pangaea.de/10.1594/PANGAEA.996141Thomas, Oliver RobertOliver RobertThomas0009-0000-1636-9492Unsworth, Richard K FRichard K FUnsworthSwansea UniversityPANGAEA2026Field experimentIn-situMonitoringrestorationEvent labelLatitude of eventLongitude of eventDate/Time of eventDate/Time of event 2Type of studyDEPTH, waterDATE/TIMEPrincipal investigatorIdentificationProjectSiteSite index codePlanting methodPlanted (yes/no)Monitoring identificationMonthYear of observationMonitoring methodSampling strategyMonitoring areaConditionExperimental plotZostera marina, shootsDepth, redoxWorm castsCanopy heightEpiphytes, coverAlgae, coverBlackeningBleachingOxidation reduction (RedOx) potentialpHSediment surface temperatureLithology/composition/faciesSea level, relativeAccuracy, verticalCommentMonitoring reference databaseField experimentManual quadrat countRuler stickVisual estimationMultiparameter probe, HANNA Instruments, HI-98191Global Positioning System (GPS), Garmin, GPSmap 60 CSxSeagrass Ocean Rescue North Wales (SORNW)2023-06-04T00:00:00/2025-10-08T00:00:00Datasethttps://doi.pangaea.de/10.1594/PANGAEA.99614810.1088/1748-9326/ae6d176936 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis dataset was collected in support of a study on the resilience of restored seagrass (Zostera marina) meadows to marine heatwave exposure in North Wales, United Kingdom (Thomas et al., 2026). It provides intertidal quadrat survey data recording seagrass shoot and reproductive shoot density, rhizome presence, canopy height, percentage cover of seagrass, epiphytes and algae, and sediment redox potential, pH and temperature, collected during repeated monitoring visits to four restored seagrass sites between June 2023 and October 2025.-4.587140999999974-4.320823000000018552.86644653.320517Natural Environment Research Councilhttps://doi.org/10.13039/501100000270NE/V016385/1The National Lottery Heritage Fundhttps://doi.org/10.13039/501100016135NL-21-00035