Lobelia gregoriana subsp. gregoriana is a rare giant alpine rosette plant endemic to Mount Kenya's extreme alpine environment where it produces ice-nucleating compounds in its leaf rosette to survive nightly frosts. Germination is challenging and erratic, requiring prolonged cold stratification followed by careful moisture management and bright light. This endangered species is rarely cultivated and seeds are extremely difficult to obtain.
Before sowing
Seeds must be cold stratified before germination. Place moist seeds in plastic bags in refrigerator at 4°C for 3 months. Sow immediately after stratification in gritty seed-starting mix. Very small seeds, extremely viable seeds difficult to collect and scarce.
Sowing
What to expect
Tips
Sow vernalized seeds on surface of gritty mix in spring when stratification is complete. Do not bury seeds as they require light to germinate. Maintain consistent moisture but avoid waterlogging to prevent damping off. Keep sealed in plastic to maintain high humidity during germination. Germination may be erratic even under ideal conditions. Very small seeds benefit from being sown immediately upon cold stratification completion. Temperature should remain steady between 18-24°C. Once germinated, seedlings are extremely delicate and benefit from high humidity. Outdoor cultivation best suits temperate oceanic climates (Ireland, New Zealand, coastal northwestern USA) or cool highland regions.
Sources: Plant World Seeds, Kew Science POWO, RarePalmSeeds, Wikipedia, Eden Brothers, Gardener's Path
