Soak the seeds with warm water for 24 hours or regular water for 48 hours before planting. Dig holes 4 inches deep and 5 to 12 inches apart for each seeds, planting them in rows if desired. Keep the soil well-watered at all times to help the seeds germinate. Water Spinach can grow well in temperature 68-86 degrees F.(20-30 degrees C.). The plant needs little attention, add a feed of nitrogen-rich fertilizer spray every two weeks.Water everyday 1-2 times per day.