Ridge Gourd vegetable drying up when it is just 2-3 inches long | Vegetable gardening | Commercial Hydroponics farming in India

I'm growing about 9 Ridge gourd plants on my terrace garden under the shade net. They all are in the 20 litres water containers with cocopeat and red soil. Good trellis is in place for all the plants and they all have grown quite long (almost 14 ft in less than 2 months.). The plant looks healthy except for the vegetable itself. Each of the plants have over a dozen baby fruits. But all of them are drying up when they are just 2-3 inch long. 🙁 We water the plant on a daily basis. Just last week, i have added coffee powder, home compost from daily dump khambas and epsom salt as fertilizers. I even sprayed neem oil and asprin (I read online that asprin is good to control diseases.). Nothing seem to have helped.

Last year, i had only one ridge gourd plant. Though it didnt grow long and though it didnt last long, it gave about a dozen good fruits. Not sure what is causing the problem this year.