The hard brown seed from the nutmeg tree (a tropical evergreen) has a warm, spicy sweet flavor. Mace is the dried lacy membrane from around the nutmeg seed. The nutmeg tree is indigenous to the Banda Islands of Indonesia but is also grown in the Caribbean, especially in Grenada. The first harvest of nutmeg trees takes place 7-9 years after planting, and the trees reach their full potential after 20 years. At one time, nutmeg was one of the most valuable spices.