Posted: 03/03/2017 at 10:34
If you put beds around the sides don't make them too narrow, the odd curve is more graceful unless you're going for something starkly modern. The earth may need improving with compost and manure. Watch where the sun is and how much shade falls where. Different plants have different needs.
I would stick with easy perennials, like hardy geraniums, salvia nemerosa, campanulas etc. Not orchids and meconopsis which can be tricky. Don't plant too close to the trees on the sides where the soil may be dry and poor from the trees taking up the moisture.
It depends how much work you want to do and how much money you have. Also future maintenance. There could be loads of options, like paths, pergolas, seating areas, flower beds not just around the edge, dividing the garden into different areas, trellis, fencing etc. Or just keep it simple with some flower borders.