None really. Just plant more trees like Pacelli says.
Last summer, Pacific Grove commissioned habitat scientists to conduct a thorough study of the conditions in the sanctuary, such as light, winds and placement of trees. The city said it will incorporate strategies proposed by the scientists into its new plan, as well as a system of feedback where the community can provide input.
One man who has given much for the sanctuary is Robert Pacelli. He spearheaded the campaign to bring potted eucalyptus trees to fill in the holes after the 2009 trimming.
His plan seemed to work. Pacelli said about 7,000 butterflies returned last winter, which was up from a paltry 700 or so the winter following the tree pruning. Numbers have been lower across the country, though, so the effect of the city’s trimming remains unclear.