Plant bulbs are generally planted in the fall or spring, but in reality, they can be planted anytime so long as you can physically dig a hole. There are many types of bulb plants, including lilies, hyacinths, daffodils and tulips, just to name a few. While each plant is different, you can generally plant them in the same manner, but you should always adhere to the planting instructions that come with your specific bulbs.
Plant your bulbs in early winter if possible. You cannot plant bulbs while the ground is frozen, so if it is, place your bulbs in a thick plastic bag called a poly bag, which is available at your local home and garden store. Then store them in a cool, dark and dry place like your garage. However, plant them as soon as possible when you can successfully dig some holes.
Plan to plant bulbs about three to six inches apart, depending on the type of bulbs. For instance, tulips and daffodils spread and grow quickly and should be planted about six inches apart, but crocuses and snowdrops should be planted only three inches apart
Plan to cluster your bulbs together. You can even mix varieties. Place smaller growing plants in front and larger ones in the back.
Dig holes that are about five inches deep for small bulbs and eight inches deep for large bulbs. The diameter of the hole should be twice as large as the bulb.
Put the bulbs in the ground with the pointed end facing up. This is the end from which the sprout will emerge.
Mix some compost or peat moss in with the soil you just dug up. Use that new soil mix to cover the bulbs. Pat the soil down with your hands to avoid any air pockets.
Mulch over the area. A couple inches of mulch will help keep your bulbs in the ground warm until spring when you may see the green sprouts begin to emerge and then bloom soon thereafter. If not, they should bloom the next season.