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Before planting onion seeds, add a 2 inches layer of compost into the soil etc. It is advisable to start onions indoors if you are planting directly from seeds.Sow the seeds 1 inch deep in the soil. Maintain a distance of about half an inch or more between each seed. If you are planting rows directly in the garden, keep a space of at least 1 and a half to 2 feet between the rows. Onion seeds usually take only 7-10 days to germinate.Once the seedlings have enough leaf growth, thin the plants to 3-4 inches apart. If you started your onion plants indoors, then 4-6 weeks from planting, take them outdoors for transplanting.Soil:Sandy loam to heavy clay with a pH level of 5.5 to 6.5.Spot: Full sun; onions cannot grow in partial or full shade.Temperature: The ideal germination temperature needed by onions is between 20°C to 25°C.Watering: If you add mulch to the soil, your onion plants will not require too much water. Onion plants can thrive on as little as 1 inch of water in a week.