suggestion please for shrubs

As per photo I have a run of Forsythia on the right hand side already established as hedging in a newly planted garden. I want to break it up with some colour so can anyone suggest some bright flowering shrubs that I could plant in front of it and which would grow to around 3-4 ft maximum, flowering from, say, June to September or is this asking a bit much of Mother Nature?? I have a Lavatera Rosea I just put in which is a nice colour and size, so any suggestions of similar?? Many Thanks

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How about something like Daphne Daphne × transatlantica Eternal Fragrance

or

Daphne tangutica Retusa Group

Beware the Daphnes are toxic so if little ones or pets are likely to come into contact then best choose something else.

Skimmia Japonica Rubella is nice too, but winter flowering.

You need to get something suitable for the position obviously.

If you look at the BBC Plant Finder you can get suggestions from there, or else I use the crocus.co.uk site because you can specify on there what height, etc you want and it will bring up suggestions.

ETA : A lovely bright plant with pink flowers in summer is Escallonia Laevis Gold Brian

 

If you're looking for a medium height shrub which will flower for a long period try Potentilla fruticosa.
There are plenty of varieties available in a range of colours, although in my experience some varieties are a bit fussy when it comes to growing conditions.
Two of the more tolerant ones which will grow happily in most conditions, except perhaps deep shade, are 'Abbotswood' and 'Primrose Beauty'.
I have both of these in my garden, I planted them about 10 years ago and they never let me down, flowering from May to September every year. Although the flowering tends to tail off a little in very dry conditions, they always come back after a good rain.

 

The 'yellow' leaved variety of Skimmia is a good compact shrub (pink flowers) and the 'siver' leaf Eleagnus. perhaps a Eupatorium with its great colour contrast ing with the Forsythia. I also like Hydrangea paniculata 'grandiflora' (white long lasting flowers) - I think there is a variety called Limelight but not sure.

 

if that area receives good sun, make a flower bed approx 1 meter wide and plant 4-5 David Austin rose bushes at equal distances .... I would tend to go for 4-5 of the same rose .... some david austin roses bloom twice a year

inbetween the roses, plant some shasta daisies superbum, .... plant them so that when mature, they join together and fill the row ... these are evergreen perenial bushes and have loads of flowers on each bush from June to September .... these are hardy, and once the flowers have died off deadhead them, .. you will be rewarded with a second flurry of flowers ... after the 2nd flurry, cut rdown to near ground level and the bush will make new shoots/growth

in front of the shasta daises, plant a row of goldsturm rudbeckia (black eyed susan) .... these are hardy, but die down in winter and grow again in spring ... these flower from August till October

during the months of august and september, the shasta daises and the black eyed susans will both be in full bloom, and it's a sight to behold ... both have simple flowers, but the colours of white/yellow/black and orange contast each other very nicely

so, with the combination of these 3 shrubs/plants, you will have interest in that section of your garden from June till October (5 months of the year)