 The Prospect and Prozell family of radiative transfer models are widely used for simulating vegetation spectra and estimating vegetation properties at leaf and canopy levels, but their performance depends on the comprehensiveness of calibration databases. The Prospect model is not suitable for mixed ecosystems with non-photosynthetic vegetation, especially in late growing seasons. This study investigates the accuracy of different versions of Prospect Prozell models for simulating spectra and estimating biophysical properties of photosynthetic and non-photosynthetic vegetation. Results show that Prospect, 5M and Prozell M achieved higher accuracy in simulating spectra of non-photosynthetic leaves and mixed canopies, respectively. The original Prozell model performed well for homogeneous green canopies, while the modified version improved accuracy for mixed canopies with photosynthetic and non-photosynthetic leaves. Overall, different versions of Prospect Prozell models have varying performance for photosynthetic and non-photosynthetic vegetation, and understanding their limitations is crucial for successful applications in estimating vegetation spectral and biophysical properties. This article was authored by Bing Liu, Cameron Proctor, and Yu Hong He. We are article.tv, links in the description below.