Then it likely wasn't the plant that had caused it. Though he'd never heard of plants causing fires, Asgard sometimes had surprises in store that needed further study. 

He looked to the other - more lively - plants around them. Connor walked to one of the healthier plants which were similar to 'Kevin', picked through its leaves to find some available thorns, and jabbed them into his finger to see what would happen. Though he did cut himself, the plant remained unscathed. "...Nothing."

He didn't exactly want to ask her to do it again but it could be the only way to get similar results to what she had experienced.