Flying in the face of expert advice I recommend under-potting bulbs, at least smaller bulbs of the 'alpine' persuasion. I don't grow anything bigger than Muscari macrocarpum in a pot. I standardize in 2 1/2", 3 1/2" or 4 1/2" square Kordlok pots, or bigger round pots if necessary, the latter adding extra width but not much extra depth. All are plastic. Everything goes into a mix of 50% perlite, 50% BioComp BC5. I have found the secret to be deep planting, in a 4 1/2" pot, for example, the corms/bulbs etc. get planted no more than 1 1/2-2" from the bottom of the pot, compost mix all the way to the bottom - the drainage is in the compost. They get fed with a dilute in-line feed with every watering. It works very well indeed. The year I got greedy and over-potted a bunch of Tecophilea was the year I lost most of them. These bulbs like company and minimal 'spare' room. I'm always mortified when I see the size of Jane's pots - so she can tell us how her system works so well for her. The bottom line, I think, is that there's no right way, just a need to be very familiar with what your tendencies are with respect to watering, and how you can best manage them. I would also suggest you group like plants together and standardize composts and pot sizes as much as possible. Best, J. John T Lonsdale PhD 407 Edgewood Drive, Exton, Pennsylvania 19341, USA Home: 610 594 9232 Cell: 484 678 9856 Fax: 801 327 1266 Visit "Edgewood" - The Lonsdale Garden at http://www.edgewoodgardens.net/ USDA Zone 6b