P -- good source of pollen
N-- good source of nectar
* -- excellent for bees

Nemophila *N Baby Blue Eyes, Sky blue flowers with a white centre, June to August.
Nepeta *NP Catmint, Cats love this even more than bees. May need protection in the early years (from the cat).
Nigella P common names for this one are Devil-in-a-bush or Love in the mist

 

Oenethera P Common names: Dune primrose, desert primrose
Olearia NPA robust holly-leaved olearia with masses of white daisy-like flowers
Origanum *NP Oregano or Marjoram, Bees love it, great herb, flowers white through purple July to October.
Osmanthus NPA member of the olive family, is renowned for its very fragrant, white, tubular flowers that appear in autumn and sometimes again in spring and summer.

 

Papaver *P Poppy, Curious jet black pollen from this favourite.
Phacelia Used as a green manure crop. Also known as scorpionweed
Philadelphus *NP Mock orange. Clusters of creamy white, orange-scented flowers in June & July.
Phlox P pronounced "flocks" and meaning 'flame' in Latin
Potentilla NP Common names include cinquefoil, five-fingers, tormentil, and barren strawberry
Prunus *NP The flowering cherries, almonds and apricots etc. Early flowering trees. Please remember to get single flowered varieties!
Pyracantha *NP Firethorn. Profuse white flowers in June & July, orange or red berries, loved by birds, in winter.