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Trees, Shrubs and Conifers: Cornus kousa

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Forum: Trees, Shrubs and ConifersReplies: 14, Views: 161
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quiltjean
North Chelmsford, MA
(Zone 6b)

May 31, 2012
1:55 PM

Post #9146528

This tree is driving me mad. Ir is bracting every other year. Another one near our entrance has only 2 'flowers'. I can't find a thing in the standard books. Help!




growin

growin
Vancouver, BC
(Zone 8b)


May 31, 2012
4:27 PM

Post #9146722

How long have they been in the ground? When they were planted, were they left in their burlap bag? Lack of blooms and intermittent blooms probably means not enough moisture during summer, lack of nutrient-rich soil or buds that are getting frozen back.
Weerobin
Saint Louis, MO
(Zone 6a)

June 1, 2012
3:38 AM

Post #9147231

I've been disappointed with the flower displays of the kousas around here.
I've seen spectacular blooms on Long Island, prompting me to plant several here.
Our cornus floridas bloom great, but kousas sparingly.
Pictured is bloom from cornus kousa Satomi from this year.
To get 3 blooms in a picture was remarkable enough to take a picture,
which tells you how sparsely it blooms!
I've speculated they need more sun than c. florida to bloom well (mine are understory),
but it's just speculation. Maybe the wide temperature fluctuations/late frosts, etc also contribute.

Thumbnail by Weerobin
Click the image for an enlarged view.

growin

growin
Vancouver, BC
(Zone 8b)


June 1, 2012
4:57 AM

Post #9147279

Where I am isn't exactly a sunny place yet they bloom heavily each year. They're loaded with blooms right now and it's been a mostly overcast spring. Maybe having that moderated climate does make a difference so planting amongst other plants (protected) instead as solitary might make the difference.

postmandug

postmandug
Bardstown, KY
(Zone 6a)

June 6, 2012
11:12 AM

Post #9154690

Wee, I'm thinking it's the humidity level in our area. Mine never blooms like the one's I see in other pictures. Mine gets sun for about 8 hours a day but still blooms sporadically. It is still a beautiful tree with great structure, gets a lot of attention from visitors so I think I'll keep it!

Thumbnail by postmandug
Click the image for an enlarged view.

growin

growin
Vancouver, BC
(Zone 8b)


June 6, 2012
11:23 AM

Post #9154695

Can't get much more humid than around here. It's been raining for weeks and these trees are right on the ocean's edge and yet still bloom heavy. Maybe it gets too hot in the summer and they prefer the cooler summers or somethin'.

Satomi

Thumbnail by growin
Click the image for an enlarged view.

postmandug

postmandug
Bardstown, KY
(Zone 6a)

June 6, 2012
11:34 AM

Post #9154707

That's what I meant to say! Our humidity combined with our heat in the summer can do a number on several plants.
Weerobin
Saint Louis, MO
(Zone 6a)

June 6, 2012
2:59 PM

Post #9154916

Boy, those Satomi's are beautiful.
Exactly why I planted mine, but sadly I don't have much to show for it.
Mine is 15yr old already, so I presume it's doing as much as it's ever going to do.
I'm going to blame it on high night-time temps.
Certainly couldn't be my gardening skills...

growin

growin
Vancouver, BC
(Zone 8b)


June 6, 2012
8:56 PM

Post #9155278

That must be the issue. We can barely grow a decent Albizia around here as we don't have the summer heat. I was surprised at the response on DG when I suggested it way back.
quiltjean
North Chelmsford, MA
(Zone 6b)

June 11, 2012
5:57 AM

Post #9160211

Thanks, Growin. This tree was grown from a 15" seedling bought from our county conservation program. It first flowered three years ago, skipped a year and flowered last year.I think last summer was drier than normal. This spring, however, has been comparatively wet. I've used some fertilizer,too. I'm crossing my fingers.

ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

June 12, 2012
10:53 AM

Post #9162222

I don't know where North Chelmsford is in the grand scheme of Massachusetts, but I bet you don't have dramatically different growing conditions than the august institution of Jamaica Plain - the Arnold Arboretum. They have some spiffy specimens, indeed. You might find images on their website.

Slightly more conducive to growing Kousa Dogwood (except for the occasional gale) is Martha's Vineyard, home to the Polly Hill Arboretum. Among the many products of her prowess were several named selections of Cornus kousa. You could check their website, or here in PlantFiles.

I think the ingredient in deficit here is patience. From seedlings great trees grow...just not instantly.

But there are good ones out there - even this one locally in KY.

Thumbnail by ViburnumValley
Click the image for an enlarged view.

growin

growin
Vancouver, BC
(Zone 8b)


June 12, 2012
11:04 AM

Post #9162239

Wow, now there's a nice specimen and I like where it's planted. Real good bloom-set. Yes, patience is needed for Kousa. My boss just mentioned yesterday, when I requested some Satomis to sell, is that people don't want to buy them as the blooms on a young tree look washed-out or pale in comparison to older specimens in the landscape. I also mentioned to my boss that trying to sell florida rubra around here isn't as easy as a good Satomi. He sent me Styrax instead. I await my Satomis patiently.

ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

June 12, 2012
3:23 PM

Post #9162580

OK, I cheated - but only a little bit.

The plant illustrated is Cornus angustata Empress of China™ (selected and patented by John Elsley), not Cornus kousa.

The point I'm trying to make is that Kousa Dogwood (like many flowering plants) has genetics across a wide spectrum when grown from seedlings. One should not expect a random seedling to behave like a well-known named selection - especially if that selection was made because of heavy flowering from a young age. That is NOT a trait of run of the mill Kousa Dogwood. A plant like Cornus kousa var. chinensis 'Milky Way' does have this trait, and should be expected to be covered in flowers even on a young budded plant.

Certainly climate and soils play a role. If Kousa Dogwood is spectacular on its home turf of Japan, then similar growing conditions (see: Vancouver, Seattle, Portland) could be expected to yield similar results. The rest of us get to slug it out, and learn by trial and error.

Maybe we just need a slight tremor every now and then. In which case, tag Weerobin - you're it (New Madrid).
Weerobin
Saint Louis, MO
(Zone 6a)

June 12, 2012
3:39 PM

Post #9162599

I'm just a smidge closer to the new madrid fault than Louisville, you know.
If it takes The Big One for my Satomi to bloom, I'll stick with my puny blooms, such as they are.

By the way, that's a pretty nice angustata.
I don't think I've seen one - or have mistaken it for a kousa, I guess.

ViburnumValley

ViburnumValley
Scott County, KY
(Zone 5b)

June 12, 2012
7:00 PM

Post #9162858

Score one for wishful thinking...hope you have adequate insurance.

You are twice as close. That means: you'll be a nice frothy frozen margarita, while we'll be shaken - not stirred.

I bet you could grow the heck out of that Empress of China™...cut down some of your weedy Davidia.

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