Can someone help ! for the last 3 years I put in 3-4 Zucchini plants , they start out big beautiful plants with lots of flowers ,the fruit starts out nice then at about 4-5 inches they stop growing then get brown at the end & then get mushy & then the plant starts dying , what am I missing ? I treat the soil with real horse manure , egg shells, lime
& vegie fertilizer & water well.