I grow willow in West Somerset England. This amazing plant produces useful slender wands and if you stick them in the earth, they grow very easily. You can only do this while the plant is dormant, when it has no leaves on, in the winter, up until mid March. I put kits together with all the instructions and aftercare notes, for living willow structures such as wigwams and tunnels for the little ones to play in, they are very easy to make and so long as the ground does not dry out they will grow almost anywhere. Every year you have to prune them and weave the new wands back into the frame. Its not just for kids though, you could make an arch on a pathway, or weave a cool and shady bower around a bench for quiet times in the garden. Drop me a line about your requirements, enough for a small wigwam is about £45 plus delivery and a large dome about £95 plus delivery. You can book a planting service if you prefer, and it is possible to turn the whole experience into a workshop with a school or youth group. Looking forward to your query.