The Urban Greening “How To” Toolkit is a practical, evidence-based guide developed under the UKRI-funded RECLAIM Network Plus to support local authorities, councillors, and officers in implementing effective nature-based solutions (NbS) across urban areas. It provides clear, accessible guidance on how urban greening can address seven key challenges: air pollution, biodiversity loss, flooding, health and well-being, heat, noise, and carbon storage through actionable strategies grounded in scientific research. Co-created with input from over 700 network members, the toolkit aims to build climate-resilient, healthy, and sustainable cities by promoting cross-sector collaboration and maximising the environmental, social, and economic benefits of green and blue infrastructure.