Given that the dawn redwood has existed for many millions of years, this is a remarkably trouble-free tree. It can be susceptible to frost damage, as it grows until late in the season and may be caught by early chills. Try to find a spot that can offer some shelter from the elements, if possible—especially if you live in the northern end of its hardiness range. Plant this tree in acidic to neutral soil that stays consistently moist—or where a water source for irrigation is near at hand. Dawn redwood will not do well in dry soil, and it needs full sun to grow its best. Choose a location with plenty of empty space surrounding the tree, as this huge specimen will need the room.
Light
This redwood needs full sun (at least six hours of direct sunlight on most days) to reach its mature height.
Soil
The dawn redwood does not do well if grown in alkaline or dry soils. If your spot is somewhat alkaline, there are methods to make your soil acidic, though you may need to repeat this treatment often. The difficulty of changing the pH increases if the soil is quite alkaline.
Water
Ideally, this tree should be planted not far from a water source to make irrigation easier. It can tolerate loamy, waterlogged soil well. Provide at least 1 inch of water weekly to the entire area under the branch canopy, which can be quite large. Large trees will absorb this quickly; water whenever the soil becomes dry to the touch.
Temperature and Humidity
The dawn redwood does well throughout the conditions of USDA hardiness zones 4 to 8 and is especially good where it receives cool humidity.
Fertilizer
This tree generally does not require feeding provided it has been planted with appropriately humusy soil. In more barren soils, apply an iron-rich fertilizer into the soil around the tree once each year. For the amount to use, follow the product label instructions.
Pruning
Dawn redwood naturally forms into a pyramidal shape, so little pruning is needed other than the customary removal of dead, diseased, and damaged branches. When the tree is young, use a long-handled pruner or pruning saw. Make the cuts at a 45-degree angle to the trunk or main branch. Regularly watch for snow and ice damage to the limbs, as these trees can become very large, and damage can extend to falling branches, obviously a serious hazard. Dawn redwoods will grow quickly and require professional trimming when pruning is necessary.
Propagating Dawn Redwood
Dawn redwood can be propagated from hardwood cuttings. Because the plant is very fast-growing, propagated trees can become contributing landscape specimens within a few years. If you take cuttings in early spring, you will be able to plant the saplings by fall. Here’s how:
How to Grow Dawn Redwood From Seed
Growing this tree from seed can be tough, as the germination rate is only about 5 percent. If you choose to try it, plant at least 20 seeds in a peat pot, covering them only to about 1/4 inch with soil. They need good light to germinate. Place the pot in a plastic bag for better humidity, keep the soil moist, and keep the pot in a cool area with only indirect light. If the seeds germinate, it will happen in 30 to 40 days. Let the seedling become strong and grow several inches before planting it in the ground.
Common Pests and Plant Diseases
Japanese beetles and spider mites can cause problems with this tree, but the damage is usually cosmetic and never life-threatening. Some fungal pathogens might try to take hold, but these can be remedied with an appropriate fungicide. The tree might develop canker, especially if it is stressed. If this happens, remove the affected branches as soon as possible.
