Fertilizing Zucchini Mix it with water and apply according to the manufacturer’s direction. If you want to grow zucchini organically, mix compost or well-rotted manure into the soil just before planting. After the blossoms appear, you can also apply an organic fertilizer.Click to see full answer. Likewise, people ask, what is the best fertilizer for zucchini?An ideal zucchini plant fertilizer will certainly contain nitrogen. An all-purpose food like 10-10-10 is generally sufficient for zucchini plant needs. They contain plenty of nitrogen to facilitate healthy growth as well as necessary potassium and phosphorus to boost fruit production.Secondly, do zucchini plants need a lot of water? Zucchini plants need regular watering to keep the soil evenly moist. The plants beg for water by wilting in the hot sun, even when the soil is moist. Similarly, it is asked, is bone meal good for zucchini? A: Yes, your zucchinis likely have a calcium problem. Adding dolomite lime or bonemeal will raise the calcium content on your soil but it may not work fast enough to give you a zucchini harvest in a few weeks. Eggshells also contain calcium.How often should Zucchini be watered?When irrigating zucchini, it’s best to water deeply about once a week. Give the plants about an inch of water every week if no rain falls. To determine if the plants need watering, dig 3-4 inches into the soil next to the plants. If the soil is dry, it’s time to water.