Do you know, I really don't know how to head off blackfly (other than wondering whether ladybirds eat them) - but I am sure gardening websites will do ideas.
Couple more things I love, then I must stop all this & concentrate on other things ...
lilac
wisteria
Oh, magnolia too. Adore magnolia. Dh is even soppier about magnolia than I am - his parents have a colossal grandiflora up against the side wall of their house. When dd was born dh painted our downstairs loo pink to celebrate - in a shade he mixed himself to match exactly a particular magnolia petal.