The green synthesized silver nanoparticles get much attention because of less toxicity, friendly environmental method, and their potential properties in various applications. Herein, the silver nanoparticles named as P.Gua-AgNPs or T.Ind-AgNPs are respectively fabricated by the oxidation–reduction reactions between silver ion and Psidium guajava or Tamarindus indica leaf extract. The Ultraviolet–visible spectrum of P.Gua-AgNPs appears the 429-nm peak while the peak of T.Ind-AgNPs is at 491 nm. The transmission electron microscopy and scanning electron microscope images show the P.Gua-AgNPs are spherical, triangular and plate-like polyshaped morphology in 5–53 nm, the T.Ind-AgNPs have spherical shape in 12–91 nm. The Fourier transform infrared spectra reveal that the particle surface contains the organic functional groups that is consisted with the elemental analysis from the energy dispersive X-ray analysis indicating the presence of C, O and Ag. So the Psidium guajava leaf extract containing abundant polyphenols, polyols, aldehyde content, and sulfur compounds creates the P.Gua-AgNPs with smaller size, narrower distribution, more diversified morphology than T.Ind-AgNPs fabricated from Tamarindus indica leaf extract being rich of organic acid and vitamin C. In addition, T.Ind-AgNPs and P.Gua-AgNPs show the highly antifungal ability against Fusarium oxysporum, Aspergillus niger, and Aspergillus flavus.