Deep Sowing Seeds

Planting seeds at the correct depth for large seeds that need soil contact and darkness.

What is Deep Sowing?

Deep sowing is the practice of planting seeds at a specific depth below the soil surface. Unlike surface-sown seeds, many species require darkness and consistent moisture at depth to trigger germination. The general rule is to plant seeds at a depth of 2-3 times their diameter.

Which Seeds Need Deep Sowing?

Large seeds: Acorns, walnuts, chestnuts, beans
Root vegetables: Carrots, parsnips, beets
Climbing plants: Beans, peas, morning glory
Trees: Oaks, walnuts, hickories, pecans
Some flowers: Sweet peas, sunflowers, nasturtium

Step-by-Step Deep Sowing

Prepare the site: Loosen soil to a depth of 12-18 inches. Remove rocks and debris.
Mark rows: Use string and stakes for straight rows, or mark individual spots.
Dig to correct depth: Use a dibber, stick, or your finger to create holes.
Check moisture: Soil should be moist 2-3 inches down before planting.
Place seeds: Drop one seed per hole, or multiple if germination rate is uncertain.
Cover firmly: Fill hole with soil and press down gently to ensure seed-to-soil contact.
Water deeply: Soak the area thoroughly after planting.
Mark locations: Use stakes or labels to remember where you planted.

Planting Depth Guide

Seed Size	Planting Depth	Examples
Tiny (<1mm)	Surface - 3mm	Petunia, lettuce
Small (1-3mm)	3-6mm	Tomato, pepper
Medium (3-6mm)	6-12mm	Bean, corn
Large (6-12mm)	12-25mm	Squash, melon
Very large (>12mm)	25-50mm	Walnut, avocado

Special Considerations for Trees

Tree seeds often require deeper planting to access consistent moisture and protection from temperature extremes. Acorns should be planted 2-3 inches deep, while walnuts may need 4-6 inches. In cold climates, plant deeper to protect from winter freezing.