Vegetable Seeds: Selection, Planting & Storage Guide

Starting from seed offers variety, economy, and the satisfaction of nurturing life from its beginning. Understanding seed biology and handling ensures strong starts and bountiful harvests.

Seed Quality Criteria

• Viability: High germination rate; test with damp paper towel if unsure.
• Purity: True to variety; no weed/other crop seeds.
• Health: Disease-free; some pathogens seed-borne (e.g., black rot in brassicas). Hot water treatment (122°F, 20–30 min) controls many.
• Vigor: Strong, uniform emergence; withstands stress.

Seed Types

• Hybrid (F1): Uniform, vigorous, specific traits; seeds don’t breed true.
• Heirloom/Open-pollinated: Stable genetics; save seeds; diverse flavors/history.
• Organic: Grown without synthetic chemicals.
• Treated: Fungicide/insecticide coating; colored. Handle with gloves.

Water Needs for Germination

Seeds grouped by moisture requirement (field capacity to wilting point). Higher moisture = faster germination. Maintain consistent moisture—never soggy, never dry.

Planting Depth Rule

General: 4× seed diameter. Exceptions: small seeds (lettuce, tomato) surface-sown or barely covered; large seeds (beans, squash) deeper. Adjust: shallower in wet/heavy soil, deeper in dry/sandy soil.

Wet vs. Dry Seed Processing

• Wet seeds (tomato, cucumber, melon, squash): Ferment tomato pulp 2–3 days; rinse. Scoop cucumber/melon seeds; wash. Dry thoroughly.
• Dry seeds (beans, peas, corn, lettuce, flowers): Dry on plant as long as possible. Harvest before rain; finish indoors if needed.

Planting Schedule by Hardiness

• Hardy (pea, onion, radish, lettuce, spinach): 4–6 weeks before last frost.
• Moderately hardy (carrot, beet, potato, parsley): 2–3 weeks before.
• Frost-sensitive (tomato, corn, bean): At last frost date.
• Frost-intolerant (melon, pepper, eggplant, basil): 2–3 weeks after.

Seed Starting Indoors

1. Clean containers + sterile mix.
2. Moisten mix; sow per depth rule.
3. Cover with humidity dome; warm (70–75°F).
4. Light immediately upon emergence (14–16 hrs).
5. Harden off 7–10 days before transplant.

Long-Term Storage

• Cool (40°F ideal), dark, dry. Refrigerator in sealed jars with silica gel or rice.
• Label with variety, date, source.
• Most seeds viable 2–5 years; onion/parsley 1 year; tomato 4–10 years.