I bought these Dutch iris bulbs in b&q (I know I know I only went in for compost)
https://www.diy.com/departments/dutch-iris-sapphire-beauty-flower-bulb-pack-of-15/3663602469988_BQ.prd
it says in the packaging plant March to May - grand. But everywhere I look it says autumn planting, December at the latest. Do I shove them in and hope for the best??