Germinating Pinguicula macroceras Seeds: Stratification Tests and Warm Sowing

Early Seed Set Suggests No Stratification Needed

P. macroceras sets seed in early spring (March–April). Like Darlingtonia (same habitat), seeds likely germinate without cold stratification. The nursery hypothesizes they behave like VFT seeds: sow warm (75°F constant), germinate in 3 weeks.

Recommended Test Protocol

1. Sow 25% of seeds immediately on pure peat moss.
2. Keep at 75°F, partial sun, high humidity (cover loosely).
3. Store remaining seeds dry in refrigerator.
4. If no germination in 3–4 weeks, cold-stratify the rest (4–8 weeks at 40°F) then sow.

Report results—the nursery has limited formal data on this species' germination.

Note: Gemmae (winter buds) are the preferred propagation method for Pinguicula; seed is tedious.