Answer: Surprisingly enough, growing bulbs in window boxes is difficult because they are not sufficiently insulated from the cold in addition to being more suscpetible to the temperatures swings. In my experience it is better to plant the bulbs in pots, sink the pots in the ground, then in spring as the bulbs emerge, place the pots into the window boxes. This provides insulation and natural chilling for the bulbs; it also allows you to remove them from the window box easily when it is time for the foliage to grow and cure. You can then replant the boxes for the summer display and the bulbs can then be planted in the ground for future years' displays.
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