This time of year forcing paperwhite narcissus bulbs is such a glorious thing. Often they grow quite tall and keeping them from falling over can be a challenge. Try planting them in a tall clear glass vessel. That way the stems are supported when they grow, helping them tremendously to stay upright. If the container is clear, you get the extra added bonus of seeing all the roots take hold, creating a really cool visual that can be as pretty as the blooms.