How to Root Thuja Green Giants


Thuja green giant trees provide excellent protection from wind and create a good privacy hedge when installing fencing is impractical. Thuja grows quickly and has been known to grow as much as 3 feet in one growing season. Hardwood cuttings root easily with bottom heat and proper watering during the winter months.

Step 1

Wait for the dormant season to root thuja green giant. Clip several 6- to 8-inch cuttings from healthy trees. Remove the foliage from the bottom 3 or 4 inches of the cuttings, making sure to leave the upper leaves.

Step 2

Fill the growing tray with potting soil and moisten slightly with the water bottle. The soil should feel damp but not soggy. Using a dibble or pencil, make uniform holes in the soil to plant the thuja cuttings.

Step 3

Pour 2 tbsp. of rooting compound into a small container, keeping the original container of hormone compound free from any contaminates. Dip the thuja cuttings into the rooting compound and place in the holes in the growing tray.

Step 4

Tamp down the soil to remove any air pockets which contain plant killing bacteria. Cover the growing tray with plastic and seal to create a mini-greenhouse. Place the growing tray, on the heat mat, in a bright location but away from direct sunlight.

Step 5

Monitor the thuja cuttings over the next few weeks by keeping the soil moist, removing any dead cuttings, and removing any thuja cuttings showing signs of mold. Ventilate the growing tray by removing the plastic for an hour each day.

Step 6

Watch for new growth on the thuja cuttings which indicates root formation. Remove the plastic and water if the soil is dry.

Step 7

Transplant the thuja cuttings to another container, if necessary, to continue growing out until spring.

Step 8

Plant the thuja cuttings outdoors after the threat of frost is over.

Things You'll Need

  • Growing trays
  • Rooting hormone
  • Heating mat
  • Clear plastic
  • Sharp pruning shears
  • Quality potting soil
  • Water bottle for misting


  • PNC Extension: Propagating Deciduous and Evergreen Shrubs
  • NCSU: Plant Propagation from Stem Cuttings
Keywords: thuja propagation, root thuja cuttings, thuja cuttings

About this Author

JulieAnn is a freelance writer from Ohio. She has been writing poetry and short stories for 30 years. Recently JulieAnn has written a variety of e-books and numerous articles on gardening, small business, and farming. JulieAnn is currently enrolled at Kent State University completing her Bachelor's degree in English.