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 Rhododendron Sinogrande 
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Joined: Sun Mar 24, 2013 2:37 pm
Posts: 191
Location: Halifax, NS
Post Re: Rhododendron Sinogrande
My sinogrande from seed ex Peter Cox, his best selfed here in Halifax, Nova Scotia. You see almost every leaf shape on it but he, Kenneth Cox and Alleyne Cook say it's true sino.

The last photo is a sibling I gave a friend in Kishorn nr. Loch Carron, photo this spring. Atlantic is 75ft away with a bit of protection from the Isle of Skye.

Image

Image

Image

Darn thing here leafs out on the one hot day in June and can get scorched if 80F. Detests warm and humid.

john


Last edited by johnw on Tue May 23, 2017 7:11 pm, edited 1 time in total.



Tue May 23, 2017 2:01 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
John - those are both beautiful specimens of sinogrande. I am anxious to receive mine, even if it is not the true species.
For the winter months, I will keep it indoors in a sunny window, as it is supposedly only hardy to Zone 8. I am Zone 6a.

When you say it detests warm and humid, how does the plant react to those conditions?
"Scorched" in sunlight or even in shade?

Thank you.


Tue May 23, 2017 2:11 pm
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Joined: Tue Aug 05, 2008 12:42 am
Posts: 1680
Location: birmingham, UK
Post Re: Rhododendron Sinogrande
Steven wrote:
Really sad, that the big leaved Rhododendrons are so seldomly seen, Rh. kesangiae hodgsonii, sinofalconeri, rothschildii, macabeanum, preptum, pudorosum, watsonii and preastans should all be reasonably hardy. But sadly enough they are hard to get.

Glendoick's seems to be the best source in Europe.


Not anymore unless you plan on collecting in person. Mail order is kaput :(

I hope this is not a taste of things to come for specialist growers :(

_________________
Regards,

Mo


Tue May 23, 2017 3:58 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
I have read on this forum and elsewhere that the selection at Glendoick for an in-person visit is not the same as what is offered in the catalog - i.e. sometimes the species Rhododendrons are not well-represented at their Garden Centre. Perhaps an order in advance will permit getting the plants one desires.


Tue May 23, 2017 7:03 pm
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Joined: Sun Mar 24, 2013 2:37 pm
Posts: 191
Location: Halifax, NS
Post Re: Rhododendron Sinogrande
Anne - I'm sure you could call in an order from the catalogue and they'd relay them to the garden centre which is 1/4 mile away. Glendoick have just discontinued all mail order a few days ago due to a host of issues including Brexit.

My partner worked there in 2000 and luckily we got a big order together and bare-rooted them all at 2c in the garage, I care never to do that again. Plant inspector went over them then she came out to the Edinburgh airport to give us the paperwork as we were leaving. The rhodos took a long time to settle in after that ordeal.

john


Tue May 23, 2017 7:21 pm
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Joined: Sun Mar 24, 2013 2:37 pm
Posts: 191
Location: Halifax, NS
Post Re: Rhododendron Sinogrande
Anne Rhody wrote:
John - those are both beautiful specimens of sinogrande. I am anxious to receive mine, even if it is not the true species.
For the winter months, I will keep it indoors in a sunny window, as it is supposedly only hardy to Zone 8. I am Zone 6a.

When you say it detests warm and humid, how does the plant react to those conditions?
"Scorched" in sunlight or even in shade?
Thank you.



Hardy to about -7c in Seattle according to Berg & Sinclair. An old-timer here was at Windsor Great Park in the 50's or 60's and said one night it hit -15 or -17c and said sino survived. I recall Hope Findlay corroborated that story but I can't remember the exact low. Must have been a memorable event........

We frequently have long foggy stretches in spring which sino loves but the minute it leafs out we'll invariably have one hot day around 26c, the new growth can get burnt by the shock. You may be ok.

Phytophthora is the big problem with heat and humidity, my guess 29c is close to the limit in eastern steam bath weather.

john


Tue May 23, 2017 7:31 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
Bare root is rough on the plants, but gladly you got them home and settled in eventually.
Thanks for the background.


Tue May 23, 2017 7:33 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
John - thank you for the temperature, etc. information on sinogrande.
I am in the central US and it does get steamy here.
We get many days at 32C (90F).

I have begun using 1/4" pieces of lava rock from Bonsai Jack in my planting mix.
That or pumice are recommended for better drainage.
Many of my species Rhododendrons are in pots.


Tue May 23, 2017 7:40 pm
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Joined: Tue Aug 05, 2008 12:42 am
Posts: 1680
Location: birmingham, UK
Post Re: Rhododendron Sinogrande
johnw wrote:
Anne Rhody wrote:


Hardy to about -7c in Seattle according to Berg & Sinclair. An old-timer here was at Windsor Great Park in the 50's or 60's and said one night it hit -15 or -17c and said sino survived. I recall Hope Findlay corroborated that story but I can't remember the exact low. Must have been a memorable event........

john


I got -15 for a few days in 2010 with day temps not exceeding freezing. Small sinogrande in a pot I may add survived.

_________________
Regards,

Mo


Tue May 23, 2017 7:42 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
Mo -

-15C = 5F - - - - very cold. I am pleased to hear that your sinogrande survived that.
Perhaps in a sheltered location?


Tue May 23, 2017 7:50 pm
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Joined: Thu Feb 23, 2017 3:46 pm
Posts: 35
Location: Middlesex, UK
Post Re: Rhododendron Sinogrande
I have a small sino from Cally Gardens
Have had it about 4 years and it has hardly grown at all.
Puts out a fresh set of leaves in spring, but is not adding anyt height.

Any ideas why??


Wed May 24, 2017 9:33 am
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Joined: Tue Oct 30, 2007 8:17 pm
Posts: 837
Location: Scotland
Post Re: Rhododendron Sinogrande
Anne Rhody wrote:
I have read on this forum and elsewhere that the selection at Glendoick for an in-person visit is not the same as what is offered in the catalog - i.e. sometimes the species Rhododendrons are not well-represented at their Garden Centre. Perhaps an order in advance will permit getting the plants one desires.


johnw wrote:
Anne - I'm sure you could call in an order from the catalogue and they'd relay them to the garden centre which is 1/4 mile away. Glendoick have just discontinued all mail order a few days ago due to a host of issues including Brexit.

My partner worked there in 2000 and luckily we got a big order together and bare-rooted them all at 2c in the garage, I care never to do that again. Plant inspector went over them then she came out to the Edinburgh airport to give us the paperwork as we were leaving. The rhodos took a long time to settle in after that ordeal.

john


I had a look at their online catalogue at the end of last week and the majority of their rhodos were showing as out of stock. In years past, perhaps 1 in 10 plants used to show as out of stock, but I reckon it was more like 6 or 7 out of 10 this time.

I know that mail order is going to stop, but I also wonder if they are going to cut the number that they are going to grow as well?


Wed May 24, 2017 11:46 am
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Joined: Sun Mar 24, 2013 2:37 pm
Posts: 191
Location: Halifax, NS
Post Re: Rhododendron Sinogrande
Promising temp news on your sino. I wonder if Seattle lows come too early.

Adam - I suspect with wild collected seed coming to an end that will affect the availability of many spp. unless they have someone dedicated to do hand-pollinations.

john


Wed May 24, 2017 1:11 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 161
Location: Missouri USA
Post Rhododendron Sinogrande
Cloudforest Gardener - Rhododendron singrande
Many of you have probably already seen this, but I am sharing this link.
http://www.cloudforest.com/cafe/palms-p ... t4432.html


Wed May 24, 2017 3:32 pm
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Joined: Tue Aug 05, 2008 12:42 am
Posts: 1680
Location: birmingham, UK
Post Re: Rhododendron Sinogrande
Anne Rhody wrote:
Mo -

Perhaps in a sheltered location?


under a fatsia but apart from that no special treatment



Adam D wrote:

I know that mail order is going to stop, but I also wonder if they are going to cut the number that they are going to grow as well?


I've already posted on this on facebook to the danish rhododendron society. Lots of disappearing lines. Example like Makinoi, clementinae ssp clementinae was avaiilable every year a few years ago...no longer there listed. I suspect to focus on less specialist rhododendrons. Smaller range to make it more economically viable.

_________________
Regards,

Mo


Thu May 25, 2017 12:34 am
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