The national call to plant trees to fight climate change requires a good stock supply! This week we're at the largest commercial tree nursery in the UK – selling approximately 35 million trees a year from it's base just outside Wrexham. We've all heard the mantra "the right tree in the right place", well behind that is a lot of research and science. Caroline Evans visits Maelor Forest Nurseries at Bronington, close to the Welsh border, where they are sowing the seeds to success specialising in home grown trees.