Flowering plants round the base of trees
I would like to get some flowering plants round the base of my trees. It's a challenge given the soil is dry and thin. Most of the trees are deciduous. I'm willing to rake off the dead leaves and scarify the soil a bit. The tree roots mean it can't be dug. Also: I'm not willing to risk bought plants, only seed, accepting that the chance of success is low. I'm not bothered about the flowering season, just want to give it shot. I've had several suggestions like hardy cyclamen, aconites ( I have seed and will try it) - any other suggestions most welcome. I am told snowdrops need open ground.
Everyone likes butterflies. Nobody likes caterpillars.