biennials to plant in situ over the next month?

in Plants
hi,
As the title says really. i love whites, blues and purples.
so far i have foxglove and planning on getting some Campanula Pyramidalis but just wondering what else i can plant straight outside?
I dont have a greenhouse and my windowsill seems to scorch seedlings i tried this year so after some that can go straight into the ground.
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sowing seeds or planting plants?
In the sticks near Peterborough
sewing seeds
Hi , i was sowing some seeds the other day - wall flowers, sweet williams going to so sow Myosotis , fox glove soon as well.
Don't forget Honesty, it comes in white or a lovely purple, also Hesperis matronalis both great for back of the border. Seeds can be sown anytime now.
thanks for the suggestions, where do you usually buy your seeds? online or in shops?
Wallflowers? Foxgloves?
beautiful and robust!