Eupatorium adenophorum leaves are too high to lodging, can you trim them?

Yes, you can. Because the leaves of dried orchids are too long and prone to lodging, they don't look good. You can trim it properly, cut off the long leaves, and trim the roots, take them out of the flowerpot, wash off some soil, cut off the long roots and replant them. Cutting roots will prevent them from absorbing water and nutrients and slow down their growth.