Posted: 10/08/2015 at 11:59
If you don't want a lot of work you could strim or rough mow the area to keep the weeds down and stop them seeding. There are plants that will grow under deciduous tree. Raising the canopy, (sawing off the lower branches), can let more light in.
I have cyclamen just appearing under trees now. Astrantia will grow in shade but would need extra water, aquilegias as well. Several hardy geraniums, G. macrorrhizum is very good in shade