As woofganf correctly states, now is the time to transplant. You can wait until the first tinges of yellow begin to show on the leaves, but not after. If you want to increase the size of the garden, you can sperate the bulbs. To increase the time of color in your garden, try adding a few tulips, hyacinths (for fragrance) and crocus'. These all have differing bloom times. You can even check the tulip varieties for early, mid, or late bloomers. This will give you color until June or so. The dreaded "D" word is involved, but only in a minor way. The bulbs should be planted at a depth of 4 times the bulbs length. this can be done with an inexpensive tool that "cores" out one hole at a time... you're probably like me and need the exercise anyway... Enjoy!