Border fillers...

Janie B

I'm now realising I didn't plant enough seeds to fill the gaps appearing in my long pink/blue border left after I've cut back some of the spring blooms ... I sowed cosmos, salvia viridis, cornflowers and some annual grasses. Any other suggestions of seeds to sow next spring for colour next summer, please? 

K67

www.seedaholic.com is a wonderful website full of information on the seeds they sell. They offer annuals and perennial seeds, they are sure to have something that fits the bill.
Chilterns is another 

Loxley

One that Christopher Lloyd always leaned heavily on was Ageratum 'Blue Horizon', not dumpy like the usual bedding Ageratums, and mixes very well with other planting. I managed to grow it from seed a couple of years ago and it was very useful and long flowering. This year I am trying Tagetes 'Cinnabar' (another Christopher Lloyd plant) because my borders are too mauve/purple and need a spark of orangey red, and a couple of zinnias, 'Purple Prince' and 'Liliput Orange'.

I have Welsh Poppies in my garden which are always there to fill a gap and add yellow/orange colour where it is needed, I just move them around.

Janie B

Thanks for the tips, @K67 and @WillDB. That Ageratum looks lovely, and will fit in very nicely, thanks! 

rebeccamM6CA_Gn6

Well if you're happy to wait until next year, I would suggest sowing some foxgloves now ready for next year if you have some room for height...failing that Campanula Canterbury bells? I bought both of these from Chiltern seeds recently and they have all been great germination wise

Janie B

@Loxley I've just sown some Ageratum Blue Horizon... they're teeny tiny seeds! Hope they thrive. Thanks for the recommendation.