Answer: Dividing an established plant may not be successful, but you can certainly try. You'll want to make sure that each division has a healthy clump of roots and a leafy stem or two. Dividing the root mass shouldn't be lethal, but it will set the plant back a bit before it resumes growing. If you'd like to increase your stock of yews, you can take tip cuttings and they should be transplant size in 2-3 years. Tip cuttings are much easier than trying to divide an established plant. Simply take 4-6" cuttings from this year's growth, strip leaves from the bottom half of the cutting, dip the cut end in rooting hormone and set it into a plastic pot filled with moistened potting soil. You can drape plastic wrap over the top of the pot to slow water evaporation. Set the pot outdoors in an area protected from sunshine and be sure to keep the potting soil moist but not soggy wet. You'll know your cuttings have rooted when you see new growth. Best wishes with your project!
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