This project aims to reduce water and fertilizer use in horticulture by using biostimulants and innovative tools. This combination will result in up to 20% reduction of water and 10% of fertilizers, depending on the crop. By including BS based on seaweeds, economic opportunities for seaweed producers will be created. Innovative sensors allow growers to monitor plant responses to reduced water supply and to adjust irrigation accordingly. Analytic tools allow users to determine water and nutrient use efficiency. This project will result in pilot data on biostimulants, generate innovative tools and demonstrate them to support growers, producers of biostimulants and suppliers of substrates & fertilizers. The multi-stakeholder appproach permits a successful realization of project objectives since expertise of all partners is complementary, ensuring a broad dissemination. A policy protocol will be presented to policy makers to help implement the new European legislation on biostimulants.