There is more to choosing bulbs than picking just a few different varieties in different colors. For the best result you need to consider the fact that even the the same flower has sub-varieties that bloom at different times. It's rewarding to use this knowledge to your advantage.
Take the common lily for example. This bulb flower has varieties that bloom
from late winter to early summer. With proper planning you can have a blooming
family member in your garden during the whole period. The same go's for the
different tulip varieties.

Smart planning and
some basic garden design rules can make the difference between a "so, so" or
a really smashing display of color in your spring garden.
There is more on spring bulb flowers and spring flower garden design to be found
in our special pages
Technical issues regarding bulbs
Of course there are technical issues to consider when you shop for bulbs. Lets
start with a breakdown of the most important issues.
Along with true bulbs, several types of flowers, sold as bulbs, grow from the
underground stem growth of rhizomes, tubers, and corms.
True bulbs are rounded, self-sufficient, underground storage organs. True bulbs
are an incubator for a flower bud embryo already inside.
Many Perennials stem from Tubers

Bulb Health
The first part in selecting healthy bulbs is to recognize the different parts
grow the cultivar."The bigger the bulb, the bigger the bloom" is a double-edged tip for selecting bulbs.
Fall Planting
First, it helps you select cultivars and decide where to place them in your
spring flower garden. For instance, crocus and anemone bulbs are tiny imps that
beg a front row or outside border seat, while giant tulip or daffodil bulbs
stand tall in back rows or keep watch over the center of your garden.
Second, larger bulbs, within a particular species , are generally more robust
than smaller bulbs and produce stronger, healthier plants and blooms.
Flower Bulbs give you the freedom to play with endless varieties of color, hue,
shape and form and really obeying a few simple guidelines it's not difficult at
all.
Spring Flower Garden
Design Tips.