One of my favorite plants for winter rock gardens is the Dwarf Mugo Pine (Pinus mugo). Native to the mountainous regions of Europe, this hardy evergreen thrives in rocky, well-drained soils ...

Resin was gathered from one Mountain Pine (Pinus mugo) and two Scots Pines (Pinus sylvestris) at the Chicago Botanic Garden. Samples were compacted in bentonite clay tablets under pressures ...