wildflower companion planting

Hello

after unsuccessful attempts at growing wild flowers in my flower beds, last year I made the more successful move to pots with impoversished soil.

Although neither are native wildflowers I was pleased last year with lavender and poached egg plants in a pot of gritty compost.

Any suggestions for companion wild flower plants for birds foot trefoil? I have lots of yarrow seedlings - are they or possibly harebells likely to be ok in limey soil with the b-t-f?