Bottle Gourd (Lagenaria siceraria) Seed Germination – Description
Bottle gourd, also known as calabash or lauki/sorakaya, is a fast-growing vine cultivated for its edible fruits. It germinates relatively easily under warm and moist conditions.

1. Seed Characteristics
Appearance: Large, oval to elongated seeds with a hard outer coat; cream to light brown in color.

Dormancy: Mild — soaking seeds helps speed up germination.

Viability: Seeds remain viable for 1–2 years under proper storage.

2. Pre-treatment (Recommended)
To improve germination rate and speed:

Soaking: Soak seeds in warm water for 12–24 hours to soften the seed coat.

Scarification (optional): Lightly rub the seed coat with sandpaper or make a small nick to aid water absorption.

3. Germination Conditions
Optimal Temperature: 25–35°C (77–95°F) – bottle gourd needs warm soil to sprout.

Soil Type: Well-drained, fertile sandy loam or loam soil.

Soil pH: 6.0–7.5.

Light: Germination occurs in darkness, but light is required post-emergence for seedling development.

4. Germination Process
Imbibition: Seeds absorb water and swell, activating internal enzymes.

Radicle Emergence: The root breaks through the seed coat and grows downward.

Plumule Emergence: The shoot grows upward toward the surface.

Seedling Development: Cotyledons open, followed by the first true leaves within days.

5. Timeline
Germination Time: Typically 5–10 days under optimal conditions.

Seedling Readiness: Transplant or thin seedlings after 2–3 weeks, when they have 2–3 true leaves.

6. Common Germination Issues
Hard Seed Coat: Causes delayed germination if not soaked or scarified.

Low Temperature: Slows or halts germination.

Overwatering: Can lead to seed rot or fungal infections like damping-off.