Flowering Dogwood trees can be easily grown from seed, however
99.9999% of the seedlings that sprout will be Cornus Florida, which is
White Flowering Dogwood. It doesn’t matter if you collect the seeds
from a White Dogwood or a Pink Dogwood, the seedlings are likely to be
white. The only predictable way to grow a Pink Dogwood, Red Dogwood, or
one of the beautiful Dogwoods with variegated leaves, is to bud or graft
the desired variety onto a White Dogwood seedling.
Dogwood trees begin producing seeds right after the petals drop from
the flowers. It’s a slow process that takes all summer. By late summer
the seeds begin to turn red, which means they are just about mature.
Don’t pick them too early or the embryo will not be fully developed
and they will not be viable. When the seeds are fully developed they
will begin to fall from the tree, and at that time you can begin to pick
them.
Ripe seeds can be removed easily. If they don’t pop right off when
you grab them, they are not quite ready, give them another week or two.
Don’t let them fall to the ground, the chipmunks, birds and other
critters love them, and usually eat them as fast as they fall.
Once picked, let them sit for a week or so, until the pulp begins to
soften. At that time soak them in a pail of water to further soften the
pulp. While still in the pail of water squeeze the seeds between your
fingers to separate the seeds from the pulp. Once they are separated
slowly add water to the pail until it over flows, allowing the water to
flow over the edge of the pail slowly. The viable seeds should sink to
the bottom of the pail, while the pulp should float to the top. Allow
the pulp to float out of the pail until you have nothing but clean seeds
laying on the bottom of the pail.
Drain the water and spread the seeds out on a table to dry. Once dry
the seeds can be stored in a cool dry place. They will keep this way for
some time.
Because Dogwood seeds have a very hard outer coating on the seed,
they need to be pretreated or stratified before they will germinate.
This process softens the outer coating so that water and oxygen can
enter, initiating the germination process. There are several ways to
stratify Dogwood seeds, from treating them with acid to storing them in
the refrigerator. I will share a couple of techniques that I think will
work the best for someone with little experience.
One technique requires that you decide what day next spring you would
like to plant the seeds and then counting backwards on your calendar for
210 days to start the stratification process. Here in the north May 15
is a good target date for planting because by then we should be safe
from frost. You don’t want Mother Nature to do them in before they
even have a chance.
210 days from May 15 would put you around Oct. 15 to start the
stratification process. To stratify the seeds using this technique
simply place them in a plastic bag with some moist (not wet!) peat moss,
or a mixture of moist peat and sand. Poke some holes in the bag, you
don’t want it air tight. Store them in this mixture at room
temperature for a period of 105 days.
After 105 days move them to your refrigerator for another 105 days.
Don’t put them way in the back where they might freeze. You want them
cool, but not frozen. After 105 days of storage in the refrigerator they
should be ready to plant outside. Just time it so that you get them
outside just after the danger of frost has past.
While the seeds are being stored check them weekly, if you have
fungus growing in the bag sprinkle a little fungicide in. Near the end
of the storage period you should be checking for germination, as soon as
10% of the seeds have germinated they should be planted out. If it’s
too early, plant them in a flat indoors, just make sure they get plenty
of sunlight.
To plant them simply sprinkle the entire contents of the bag on top
of the soil and spread it out. Sprinkle some light soil over top. Do not
plant the seeds too deep. ¼” of soil over top is all you want. Water
them thoroughly after planting, then allow the soil to dry out before
watering again. Make sure you plant them in an area that drains well,
you don’t want them in soggy soil or they will rot.
That’s one technique. Another technique is to nick each seed in a
couple of different places with a knife right after the seeds are
cleaned, and plant them out immediately in the fall. Cover the seed bed
with a piece of screen so the critters don’t dig them up and eat
them.
Which technique works better?
I don’t know. There are so many variables that can change the out
come that I have not seen where one works better than the other. I
suggest you do some each way and see what works best for you. I like
getting them planted right away in the fall and putting Mother Nature in
charge, but it’s disappointing if something happens and you have a
poor stand, that’s why it’s always nice to try some both ways.
You can also grow Chinese Dogwood (Cornus Kousa) from seed. Chinese
Dogwood is very popular because it flowers much later than most other
ornamentals. Late June is usually when they are in bloom, and the
flowers are cream colored against dark green foliage. It makes the
flowers look mint green in color. Just use the same techniques as above.
Michael J. McGroarty is the author of this article. Visit his most
interesting website, http://www.freeplants.com
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