Bonsai Seed Table — Stratification, Scarification & Planting by Species

Seed treatment and planting by tree species:

Japanese White Pine — warm stratification in moist peat moss within 60 days; scarify in warm water within 24 hours; sow 3/8 inch deep. Gray Bark Elm — cold stratification within 60 days; warm water within 24 hours; sow in the soil (depth not specified). Japanese Firethorn — cold stratification within 30 days; warm water within 24 hours; sow 1/8 inch deep. Japanese White Birch — cold stratification within 60 days; warm water within 24 hours; sow on the soil's surface. Trident Maple — cold stratification within 90 days; warm water within 24 hours; sow 1/4 inch deep. Japanese Maple — warm stratification within 120 days then cold stratification for another 120 days; hot tap water within 48 hours; sow 3/8 inch deep. Nomura Red Maple — warm stratification within 60 days then cold stratification for another 60 days; hot tap water within 48 hours; sow 1/8 inch deep. Japanese Larch — cold stratification within 30 days; warm water within 24 hours; sow 1/16 inch deep. Japanese Hornbeam — warm stratification within 60 days then cold stratification for another 90 days; warm water within 24 hours; sow 1/8 inch deep. Japanese Heavenly (Nandina) — no stratification needed; warm water within 24 hours; sow 1/8 inch deep.

Species references: https://www.bonsaitreegardener.net/bonsai-trees/species/jack-pine ; /black-olive ; /rosemary ; /pine ; /needle-juniper ; /juniper ; /japanese-maple