Sweet corn seeds should generally be planted about 1 inch deep in heavier soils and up to 2 inches deep in light, sandy soils. This depth ensures good seed-to-soil contact and adequate moisture for germination. Seeds should be spaced 8 to 12 inches apart in rows that are 2½ to 3 feet apart. Alternatively, sweet corn can be planted in hills with 4 to 5 seeds per hill spaced about 3 inches apart, with hills spaced 2½ feet apart
. Planting at about 1 to 2 inches deep balances the need for uniform germination and emergence, while protecting the seed from drying out or temperature fluctuations. For corn in general (including sweet corn), 1½ to 2 inches is often considered optimal for root development and seedling health, especially in well-drained soils
. Planting too shallow can cause poor root growth and risk of plants lodging, while planting too deep can delay emergence if soil moisture is not adequate
. In summary:
- Heavy soils: plant sweet corn seeds about 1 inch deep
- Light sandy soils: plant about 2 inches deep
- Seed spacing: 8–12 inches apart
- Row spacing: 2½ to 3 feet apart
- Planting in hills: 4–5 seeds per hill, 3 inches apart, hills 2½ feet apart
This planting depth and spacing promote good germination, root development, and pollination for healthy sweet corn growth
