Direct sowing in clay soil - what flowers?
I want to try filling in the gaps in my "cottage garden" look bed with direct sown annuals. These have always failed for me in the past, not sure why. Possibly because I have very heavy clay; possibly because the other (perennial) plants in the bed are competing too much with them. Or maybe I'm just neglectful...
This year I want to try again, waiting til later for sowing (I'm told May is sensible). What would people recommend as bomb-proof, colourful flowers? The general colour scheme is blues and pinks - but I'm happy to mix it up with yellows / oranges. The bed contains geraniums, japanese anemones, pinks, penstemon, nepeta, asters, verbena bonariensis, alchemilla mollis and various other things - a bit of a hotchpotch but quite pretty.
All suggestions welcome!