Posted: 29/04/2015 at 07:16
I find that the hardy geranium Phaeum is very happy planted in the shade of our large trees, it's already in flower and will be loved by the bees and hover flies etc all through the summer. It's easy to grow and isn't eaten by slugs and snails, and comes back every year providing good groundcover - it spreads gently without becoming invasive.
Another one for nectar for early bees is pulmonaria, as long as the ground isn't too dry.
I'm sure others will come along with more suggestions.