Invasive plants are wreaking havoc on Indiana's ecosystems. It's why last year the state put the Terrestrial Plants Rule into effect, banning 44 species of them from the landscaping trade. But experts say there were a few glaring plants left off the list. Most notably? The Bradford pear tree. This plant, favored by landscapers for its beautiful white blooms and stately appearance, is one of Indiana's most criminal invasive species. Bradford pear trees, also called Callery pears, bloom earlier in the year, giving them an advantage over native species and allowing them to take their resources for its own. The trees have become so ubiquitous in Indiana that in some places you can find entire fields of them.