Sorry to dig out that ancient thread but I have some questions about T. regelii culture.
So I guess the main issue is moisture before growth sets in. For now I am planning to only plant them in early December. They will be planted in buried in large pots, basically cylinders with mesh cover at the top and bottom out in the open. Probably should cover them against heavy winter rain as well though the soil here is extremely well drained due to the karst underground. The deeper soil never ever gets wet.
What about substrate? Should it be different from other wild tulips? More course with less organic components? We are talking about mature bulbs here, not seedlings.