Mostly annuals like arctium lappa, erigeron canadensis, Lunaria annua, but also some perennials like Clematis vitalba and centranthus ruber. Dreinage I think it’s ok because Is a very stoney soil, not sure about a compaction layer, I think there Is no compaction because no machinery were used on the land, but maybe there are other factors that can develop compaction like magnesium but I will do a soil test this fall.