Q- Is this narration authentic? Allow the watermelon to become huge for they are the garments of the earth. Its water/juice is a cure and the sweetness is from Jannah. عظموا البطيخ فإنه من حلل الأرض ماؤه شفاء وحلاوته من الجنة
The Muhaddithun have declared this Hadith a fabrication. The Hadith should not be quoted.(Dhaylul La-Alil Masnu’ah, Hadith: 651, Tanzihush Shari’ah, vol. 2 pg. 260)
And Allah Ta’ala Knows best.
https://hadithanswers.com/a-fabricated-narration-on-the-watermelon/