building a greenhouse & a home with an entire tree!

click here for the whole article: http://www.nytimes.com/2009/11/05/garden/05tree.html

After finishing the A-frame, Mr. Gundersen built a 100-by-20-foot solar greenhouse next door with thick straw-bale walls on three sides, banked into the north slope. He used small-diameter, rot-resistant black locust trees for the timber framing.

A wall of double-paned glass, positioned to optimize the low-angle winter light, faces south. Growing beds angled slightly toward the sun are planted with rows of mustard greens, kale, chard, arugula, lettuces and herbs. Hanging trays of micro-greens and a fig and bay tree promise fresh food for the fall and winter.

But it is the Book End — the little house attached to the greenhouse, which is home to the firm’s project manager and his wife — that quietly vibrates with the spirit of the forest.

“We used a lot of standing dead elm here,” Mr. Gundersen said, pointing out the delicate trails, or galleries, left by the beetles that killed the tree. Peeled of their bark and satiny smooth, these trees have a presence that seems to draw one’s arm around their trunks and invite a viewer to lean into them, to soak up strength from these powerful old souls.

In this quiet farming community, where people may not have a lot of money to spend, but do have plenty of wood and straw, word of the beauty and practicality of Mr. Gundersen’s structures has spread. Solar greenhouses made of local materials can extend the growing season through winter, even in a place where temperatures can drop to 30 or 40 below. In the last 18 years, Whole Trees has built 25 of them here.