Lily of the valley are one of the easiest spring bulbs to force indoors. Their miniature bulbs are called "pips." They are available all winter long pre-chilled and ready to plant into pots for forcing. The pips will produce fragrant lily of the valley blossoms in 3 to 4 weeks from the time you plant them.
Fill a 3-inch deep container or plant pot with a mixture of half potting soil and half peat moss. Tap the bottom of the pot on a hard surface to settle to soil mix.
Soak lily of the valley pips. Add warm water to the bag they came in so the peat moss packing material is very wet. Set the bag into the sink and leave it for an hour. The pips will absorb water and plump up. This "tricks" them into thinking it is spring and they will begin to wake up.
Cut off the bottom inch of the roots. Do this right before inserting them into the soil. This will help the pips take up water and they'll start growing right away.
Plant the pips into the prepared pot, spacing them about 1- to 1½-inches apart. Set them into the soil so that the tops are just at soil level or slightly poking above its surface.
Water until it drains out of the bottom of the pot. Check the pot daily and keep the soil evenly moist but not soaking wet.
Put the pot in a place that is 60 to 70 degrees Fahrenheit with low light levels. Keep out of direct sunlight. The leaves will begin to grow in about a week.