Agreed that if the thought is that crocking results in better drainage - well, that's a crock of animal fertilizer. If, as Ina mentioned, the plants are shallow rooted and the goal is to reduce weight while using a taller container for appearances, then using a non-potting mix filler material should not be an issue. Bulb in 6 inch tall, 6 inch wide container. No issues, right? Bulb in 6 inch wide, 12 inch tall container - yes, better drainage than in 6 inch deep container. Bulb in 6 inch wide container, with 1/3 of 12 inch height filled with soda cans / packing chips (ghost farts, my brother calls them) / whatever should still drain satisfactorily, wouldn't it?. Judy in New Jersey where Galanthus 'Potter's Prelude' is budding up quite nicely. It amuses me that the month or so earlier flowering G. regina-olgae waits until Spring to send up leaves and this later snowdrop produces leaves with its flowers. Whatever works . . . . --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com/