**5. Conclusions**

In the current study, SwE application boosted plant growth traits, fruit and young shoot yield, NUEys, mineral profile and functional components of young shoots. Concurrently, Sicilian bottle gourd landraces showed a relevant range of genetic variability. Overall, the results suggested that combining G4 and G5 landraces with 3 mL L−<sup>1</sup> SwE profoundly upgraded young shoot yield, plant height, number of leaves young shoot yield and NUEys index. Quality traits such as SSC, minerals concentration, ascorbic acid and polyphenols content were also improved.

**Author Contributions:** Conceptualisation, L.S. and G.I.; methodology, L.S., G.I., C.D.P. and S.L.B.; software, B.B.C., L.S., R.P.M. and C.N.; validation, L.S., G.I. and S.L.B.; formal analysis, B.B.C., L.S., R.P.M., C.N. and S.L.B.; investigation, B.B.C., L.S., C.D.P., G.I. and S.L.B.; resources, L.S., C.D.P. and S.L.B.; data curation, B.B.C., L.S., R.P.M. and C.N.; writing—original draft preparation, B.B.C., L.S. and G.I.; writing—review and editing, L.S., R.P.M., C.N., G.I. and S.L.B.; visualisation, L.S. and G.I.; supervision, L.S. and G.I.; project administration, L.S., G.I. and S.L.B.; funding acquisition, L.S., C.D.P. and S.L.B. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
