I always like to mention Ivy (Hedera hexlix) at this point in the year. It's the last of our native species to flower in great profusion and provides nectar and pollen for many kinds of insect. The berries that follow are winter food for birds and it's a valuable habitat for wildlife all year round.

 The foraging months for pollinators have been somewhat extended by the introduction of various 'exotic' plants but for sheer volume alone Ivy is hard to beat.

 The patch above was covered in wasps.

 

  Speaking of 'exotics' Buddleja davidii is now as common as muck in the UK but it hails from China and Japan.

  Sometimes known as 'Butterfly Bush' it supports a wide range of pollinators in late summer and early autumn.