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Stratifying Hard Seeds: Lychee, Avocado, and Others

Hard seeds (lychee, avocado, many trees) benefit from stratification—mechanical or chemical scarification followed by soaking—to break dormancy and speed germination.

Simple Stratification Method

Nick the seed coat with a knife or rub lightly with 400-grit sandpaper.
Soak in tepid water for 24 hours.
Sow immediately in moist potting mix.

This can cut germination time nearly in half. After sowing, follow standard seedling care: warmth, moisture, light.

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