Watermelons can be grownon well-drained sandy to sandy loam, medium black soils rich in organic matter. Alluvial soil along the river beds is also good for production of watermelons.A pH range of 6.0-7.0 is considered as optimum.Normally saline soil(magadi) is not suitable for water melon as the soil affect fruits and roots.
Husambazwa na vimelea vya fungasi vinavyoishi kwenye udongo. Ugonjwa hujitokeza zaidi wakati wa kiangazi. Vimelea hushambulia sehemu au mirija ya mmea ya kupitishia maji na chakula. Mmea hukosa maji na chakula na hatimaye hunyauka.