If you are contemplating planting a tree to provide shade, consider the green ash (Fraxinus pennsylvanica). This deciduous ornamental tree will grow to 60 feet in height and makes a stunning addition to the garden. The green ash needs deep, well-drained soil but will tolerate a slightly acidic root environment. Propagating the green ash from cuttings will require you to find either a seedling or a sprout, no older than one year. According to the USDA Forest Service, there is no way to propagate, by cuttings, the mature green ash tree. Therefore, plan on propagating with seed. The green ash tree is hardy to USDA Zone 3.
Soak the seed in water for 24 hours.
Moisten the perlite and place it in a plastic bag. Push the seed into the perlite and seal the bag. Place it in an area that remains 65 to 70 degrees for eight weeks. Placing the bag under heat lights will help to maintain a constant, warm temperature. Check the perlite frequently and drip water over it if it appears to be drying.
Place the bag in the refrigerator for 12 weeks. Check the perlite and moisten it if it appears to be drying.
Pour equal parts of compost and potting soil into a planting pot and water it until the excess water drains from the bottom of the pot.
Plant the seed 1 1/2 inches into the soil and cover it with soil. Place the seed in a dark area until it germinates. You can also cover the pot with burlap to maintain a dark environment.