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Growing Trees from Seeds

There are some circumstances in which the best way to obtain new plants is to grow them from seed. For example, someone who wants to fill a large area with dozens of trees can do so much more easily (and cheaply) by planting seeds rather than setting out individual plants.

Also, for some rare species it may be difficult to obtain live specimens, but seeds might be available. For a very rare species, growing from seed might be the only practical way to get a plant.

Another advantage of seeds is that each tree is normally a genetically-unique individual, whereas purchased plants are often clones. In fact a species depends on this individually in order to survive, since the variability allows it to resist diseases and adapt to changing environments. The vast majority of natural trees grow from seeds.

One disadvantage of seeds is that it usually takes 2-4 years to get a plant of similar size to a purchased plant. But for someone with a long-term perspective, this isn't too important, since in the long run a few years doesn't make much difference.

Growing a plant from seed also allows a person to see its entire development and better understand its life history. A person may also feel a stronger attachment to a plant that he or she grew from seed.

Seeds of most trees need considerable time to germinate. Many of them have to spend a full winter in the ground, and some need two (or more) winters. For the latter, the alternating cold and warm exposures stimulate the complicated chemical processes within the seed needed to produce germination.

For species whose seeds take two or more winters to germinate, you might want to plant the seeds in the ground, carefully mark the location, and then wait. However, some people prefer to plant in pots, although more care is required, since the soil must be kept moist, yet good drainage is also essential to prevent sogginess. Pots should be left outdoors during the winter, but protected from excessive rains or long periods of freezing weather. If possible, put them in a sheltered area such as a shed or porch, but make sure that the soil doesn't dry out.

Because germination rates are often low, you should consider planting at least twice as many seeds as the number of plants you want to obtain. Any extras can be destroyed or given to someone else.

Here are the seed treatment recommendations for some of the species discussed on this site:

Lost Franklinia (Franklinia alatamaha):
Collect the seed capsules in the autumn after they turn yellowish and begin to open. Remove seeds and plant immediately for germination the following spring. Note that seeds collected from an isolated plant may not germinate.

Carolina Silverbell (Halesia tetraptera):
After collecting in autumn, soak these hard seeds in water for about 24 hours, then plant and keep the soil moist. Normally they won't germinate until the second spring. Many batches of these seeds never germinate at all, so before planting you should open a few capsules to make sure that they aren't empty.

Pagoda Dogwood (Cornus alternifolia):
The fruits of this tree can ripen as early as mid-summer. If seeds are removed and planted immediately, they may germinate the following spring. Seeds planted later in the year may not germinate until the second spring.

American Yellowwood (Cladrastis kentukea):
Seeds of this species need to be scarified by rubbing with sandpaper or a file. Then if planted in the fall, they should germinate the following spring.

Mountain Camellia (Stewartia ovata):
Collect pods of Stewartia ovata in mid to late autumn, then remove seeds and plant immediately, in pots or ground. Keep the soil moist throughout the following summer and fall. Seeds should germinate in the second spring. (Occasionally a seed may come up in the first spring.)

Chalk Maple (Acer leucoderme):
Seeds are shed in late summer or early fall. Collect and plant immediately for germination the following spring. Because germination rates are often low, you may need to plant a lot of seeds in order to get just a few plants.

American Persimmon (Diospyros americana):
Collect fully-ripe fruits in autumn and extract the seeds. Wash the seeds thoroughly to remove chemical inhibitors. Some people also recommend light rubbing with sandpaper. Seeds planted in the fall should germinate the following spring.

Cinnamon Clethra (Clethra acuminata):
In nature the tiny seeds of Clethra acuminata germinate after landing on moss. Collect the dry seed heads in late autumn and store over winter. In late spring shake out the seeds and sow under glass on the surface of moist vermiculate. Keep moist and allow light to fall on the seeds during daylight hours. Should germinate after 4-6 weeks, depending on the temperature.

Mountain Holly (Ilex montana):
Remove seeds from ripe fruit in late fall and plant immediately. In most cases they won't germinate until the second or third spring.