Pine trees, as with any typical conifer, keep their needles all year. Deciduous trees, such as maple, birch, or hickory, drop their leaves as the days grow colder. This is a mechanism used to ...
“I started looking at growing other food crops with trees, using our expertise and ... he is raising 14,200 seedlings—11,000 Scots pine, and a mixture of Sitka spruce, silver birch, hazel ...