Crocuses are small, blooming plants that are often the first flowers to bloom outdoors in late winter in early spring. They can also be forced to grow indoors, any time of year. Plan to begin the forcing process about 3-4 months before you want them to bloom, because they have to go into cool storage for awhile, to grow roots before they'll bloom.
Choose a planting pot that has drainage holes and is about 7 to 8 inches deep. Fill it halfway with soil-less potting mix, which is available at most local garden centers.
Place the crocus bulbs on top of the potting mix. Set them close together, but not touching. This is different from planting crocuses outdoors where they should be planted several inches apart from one another.
Add more potting mix until only the bottom half of the bulbs are covered. This is also different from planting them outdoors where the entire crocus bulbs should be planted beneath the soil.
Water the bulbs well until the water comes out the drainage holes.
Place the pot in a cool, dry location that is between 40 and 50 degrees F, such as a garage, attic, crawl space or refrigerator. If placing the bulbs in the refrigerator, then set the pot in an open plastic bag first to prevent the soil from drying out too quickly.
Check on your bulb every couple weeks. Be sure the soil is slightly moist while in cool storage. Then, in 10 to 12 weeks, move the pot to a warm area, out of direct sunlight. Continue to keep the soil moist.
Move the planted pot to a sunny location (e.g., south facing window) when the stems begin to emerge from the bulbs. Continue to keep the soil moist and your crocuses should bloom in a few weeks.