Filling my borders

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Acer? Beautiful coloured foliage, especially at the back end of summer/early autumn.
Spirea.? Lots of lovely pink or white blossom through summer.
Ceanothus or California Lilac? Dense deep blue flowers.

Myrtle, lavatera ( cheap and cheerful!) winter box

Than you both for your suggestions.

Hebes? Flower long into the autumn, don't clash with anything else, compact, hardy in most places.

Thank you everyone, I have tried a couple if the above but they didn't flourish, I will plant a couple if spirea, a weigela, as well as an acer.

Penstemons give good colour and last until the frost.

Erysimum Bowles Mauve flowers it’s head off from Spring through to early winter and makes a decent size for colour in a border. Bees love it.

Philadelphus, spirea, lilac, potentilla, Abelia, euonymus, hypericum, this is just me having a quick look round my borders, they are a work in progress. I almost forgot my absolute favourites weigela and hydrangea.