I'm interested in getting a few of Birch-Poplar hybrid trees to try out for burning in the stove. They grow quick and appear to give reasonable heat output (15-17 btu) for the speed they grow at. I'm aware they may take a while to season but that's ok. Does anybody have experience with these? What are the best ones to go for and where would I get them? Happy to grow from seed too. I tried contacting a supplier in the south midlands but haven't been able to get in touch.