Tsuga heterophylla, commonly called the western hemlock, is a species of hemlock in the family Pinaceae. T. heterophylla are native to the western coast of North America, ranging from northern California to Alaska. The western hemlock is a large tree, growing up to 230 feet tall. They are an important source of timber for the region. T. heterophylla is commonly grown as an ornamental tree. The new growth can be brewed into a tea, and the cambium of the bark can be eaten fresh, or dried and processed into a bread. Western hemlocks have interesting foliage, rugged trunks, vigorous growth, and are easily grown in containers, making them a good choice for bonsai.
Tsuga heterophylla seeds require a brief period of cold stratification to germinate reliably. Place the seeds in a ziplock bag containing a small amount of moist, but not soaking wet sand or vermiculite. Make sure the seeds are distributed through the moist sand/vermiculite and place the seeds in the refrigerator for 4 to 6 weeks. After this cold stratification, plant the seeds 1/8th inch deep in a well draining potting soil. Keep the seeds moist, but not soaking wet between 65°F to 75°F for best results. Seeds typically take 1 to 4 months to germinate, even with optimal conditions, seeds may have slow and sporadic germination.
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