There is an increasing concern regarding the water efficiency of turfgrass in cities and parks. This paper aims to test the performance of different warm-season grass cultivars that could replace the more demanding cold-season ones. A control C3 mix (Festuca arundinacea Schreb., Poa pratensis L., and Lolium perenne L.), two C4 mixes (Cynodon dactylon × Cynodon transvaalensis, cultivar' Texoma (OKC1876)' and Zoysia matrella cultivar 'Zorro'), and a C3-C4 mix (Cynodon dactylon × Cynodon transvaalensis, cultivar 'Texoma (OKC1876)' overseeded with L. perenne and F. arundinacea) have been cultivated in individual plots on the experimental grounds of the Universidad Politécnica de Madrid, Spain. At various dates throughout the spring, pictures of the plots have been taken and analysed, measuring green intensity through three different methods (Green Index, Excess of Green, Canopeo) and their homogeneity. Among these three methods used to measure green intensity, the green index method has been able to detect a significant difference between species for a more extended period than the others throughout the spring green-up. After the control mix, the overseeded C3-C4 mix has been the earliest to reach its peak green value, and Cynodon dactylon × Cynodon transvaalensis, cultivar 'Texoma (OKC1876)', has been the most homogeneous one after green-up. The findings in this paper will aid in the selection of turfgrass species for future urban green spaces that are less water-demanding.