Plant Italian squash seeds in soil made of organic fertilizer and manure.
Test the soil temperature. The soil must be warm enough — ideally between 60 and 105 degrees Fahrenheit — to allow the seeds to germinate.
Mark a spot for the Italian squash bushes somewhere in the garden that receives constant sunlight and heat.
Sow three or four seeds in one place, and leave about 18 to 24 inches between each set of seeds. Two Italian squash bushes will produce plenty of vegetables for a family of four.
Transplant any zucchini bushes that are growing into each other. Planting bushes too close together is a common mistake that will result in plants that cannot get enough water and will eventually die.
Harvest the young Italian squash from the center of the bush throughout summer, or else new squash will not grow in. The squash are ready to eat when they reach a length of 4 to 7 inches. The older fruits around the edges of the bush have a tougher skin and not as pleasant a taste; leave the old squash on the bush, or feed them to chickens.