How to force bulbs indoors.

Step 4 Cool period.

Some bulbs need to be in a period of cool to promote good root growth into the soil and produce larger and more exquisite blooms. Most bulbs that are sold at the store are sold cool treated and only need to be placed in some soil and they will grow. If your bulbs are not cold treated, place the pot in a cool, dark place, like a garage or basement until you see the stem begin to grow and some green emerge from the bulb.