A study finds that almost 60% of nectar produced by ivy in autumn goes uncollected by pollinators.
You can read the blog post at https://botany.one/2023/03/a-bounty-of-wasted-pollen-and-nectar-poses-new-questions-for-pollinator-conservation/
You can read the original research at https://resjournals.onlinelibrary.wiley.com/doi/full/10.1111/een.13231