At its best:
Jun, Jul, Aug
Add crocks to aid drainage and fill the window box one third full with multi-purpose compost.
Plant the bulbs on the surface of the compost, spacing them around 5cm apart. Make sure you plant them in the right direction, with the fatter end of the bulb facing down, and the wispy tip of the bulb facing upwards.
Cover with more multi-purpose compost and water thoroughly, allowing to drain before popping the window box in its final position.