Jack pine and black spruce trees fall into this category, according to David Mladenoff, professor emeritus at the University of Wisconsin-Madison. Both species reproduce by using cones that are sealed up with resin, and open to spread seeds only under the intense heat of a fire.
“The nature of the (jack pine and black spruce) trees — their foliage, their bark, they have a lot of resin — they burn easily. They kind of encourage fire because they need fire,” said Mladenoff.