Weeds represent a wide range of plant species that spread worldwide and are important biotic component within many environments. Identification of weeds negative and positive characteristics could lead to a better use of them in many directions such as biocontrol agents. The red palm weevil is considered as one of the insect pests that cause damage on date palms in Saudi Arabia. Some natural products have been tested successfully against different stages of different insect species either under laboratory or field conditions. The aim of this study was to evaluate the effect of aqueous extracts of Euphorbia peplus, Salsola kali and Heliotropium longiflorum leaves and stems on palm weevil larvae. E. peplus results showed the LC₅₀ of the leaves-aqueous extract was 6656.32 ± 756.78 mg/L, while the stems-aqueous extracts showed LC₅₀ of 2574.63 ± 602.56 mg/L. Salsola kali leaves-aqueous extract on palm weevil larvae showed LC₅₀ of 2088.84 ± 186.21 mg/L, while the stem-aqueous extract resulted in LC₅₀ of 1617.67 ± 57.54 mg/L. The aqueous extracts of H. longiflorum leaves on palm weevil larvae reflected LC₅₀ of 3949.04 ± 190.55 mg/L, while the stem-aqueous extract reflected LC₅₀ of 3678.48 ± 398.11 mg/L. According to the obtained LC50’s±SE, the aqueous extracts of S. kali stem and leaves showed relatively higher larvicidal potentiality against palm weevil larvae, followed by E. peplus stems, then H. longiflorum stems and leaves, and at the last rank and choice, the leaves of E. peplus which showed the lowest efficient aqueous extract against palm weevil larvae.