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It's Pumpkin Time! by Zoe Hall (1999)
References to this work on external resources.
Wikipedia in English
A brother and sister plan early for Halloween fun by planting pumpkin seeds in their garden in the summer. Later, they watch as the seeds sprout and eventually grow into bright orange pumpkins for their jack-o'-lanterns. This bright picture book, with its vivid cut-out illustrations, provides an excellent introduction to how things grow.
(summary from another edition)
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