Ohio is an ideal climate to plant and grow asparagus. While it's possible to grow asparagus from seed, most home gardeners purchase asparagus crowns that are 1 year old. They require less work to grow and the chance of success is greater. Each crown usually produces about a 1/2 lb. of spears. Consider a hybrid variety that is all male, such as Jersey Giant. Males do not use vital nutrients, energy and water to produce seeds as the female plants do, which in turn yields in a smaller harvest.
Wait until the soil reaches at least 50 degrees Fahrenheit, which in Ohio, typically occurs anytime between mid-April and May. Use a soil thermometer to determine the temperature.
Till an area that is in full sun to a depth of about 6 inches. Then, incorporate 2 lbs. of 10-20-10 fertilizer per 100 square feet. This area must drain water well and should not have puddles several hours after a hard rain.
Dig a furrow (trench) that is 5 to 6 inches deep and 4 inches wide. Add about 1 lb. of fertilizer labeled 0-46-0 for every 50 feet. Spread it evenly along the bottom of the furrow. Space multiple rows 5 feet apart.
Plant crowns 1 1/2 feet from one another. Set them in the furrow in any direction since they will grow upright.
Backfill the soil until the furrow is back to ground level. Do not pack it down as you would for other plants that you grow in Ohio.
Water the planting bed with about 1/2 inch of water only if the soil is not already moist. Then, water only when rain is scarce and soil conditions become severely dry, which is rare in Ohio. Asparagus do not need a lot of water to thrive.