I've just bought this on Ebay.
I want to try my hand at making a Semp ball when I have enough chicks (so probably not for a while yet). Although I think I'm going to try and find a tall vase like container or plinth to place it on rather than hang it.
Does anyone have any good tips for planting shapes? I made some topiary frames last summer for hedging plants - they still have a way to grow to fill the frames, but I see even more semp ones in the future!