turn your bulbs sideways, it will give you more vertical space
it is a bad idea to keep multiple plants in the same container, but if you water them more frequently, and maybe place some dividers into the soil between each plant to seperate the roots it may work. dont worry, if you get a male, you just cut the stem.
If you just cut the stem, you risk the undesirable plants roots rotting and creating a disease issue. You are better off useing seperate containers.