Grow a lovely fragrant hyacinth as a pretty winter indoor flower with these growing glasses. full with water to about 1/2cm below where they bulb will sit in the top of the glass. A gap will prevent the bulb rotting. Coloured stones or decorative gravel can also be added to the bottom of the glass if desired. . Place in a cool area for around 10 weeks checking the water level and topping it up regularly. Once the roots have reached the bottom of the glass and top shoots are around 3cm it can be moved into a warmer area gradually being moved closer and closer to a sunny spot. Growing glass only, bulb not included.