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 Rhododendron Sinogrande 
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Joined: Wed Dec 09, 2009 10:20 am
Posts: 98
Location: Eastbourne UK
Post Re: Rhododendron Sinogrande
Mo - for you - here it is a while back with the two hybrid Rhododendron (one is R 'Fulbrook') planted for their flowers doing their bit.

ImageRhododendron - raised bed over chalk - May 2015 by Grenville, on Flickr

In addition to R sinogrande (here in flower)

ImageRhododendron sinogrande - April 2014 2 by Grenville, on Flickr

and the hybrids are R macabeanum

ImageRhododendron macabeanum - August 2014 IMG_5586 by Grenville, on Flickr

and

R pachysanthum

ImageRhododendron pachysanthum - August 2014 IMG_5671 by Grenville, on Flickr

Already the two hybrids are swamping the others and I think will have to come out.


Sat Jul 11, 2015 11:33 am
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Joined: Tue Aug 05, 2008 12:42 am
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Location: birmingham, UK
Post Re: Rhododendron Sinogrande
The pachysanthum is awesome. No bureavii? Don't worry you don't need to answer that. You can disappear and skulk in the background now. I'll just have to love you from afar :roll:

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Sat Jul 11, 2015 6:03 pm
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Joined: Sat Dec 01, 2007 6:15 pm
Posts: 855
Location: Brookings, OR, USA
Post Re: Rhododendron Sinogrande
Martinnicklin wrote:
I bought one to replace one lost in 2010. Mine is only about 18 inches tall but had two flower trusses on it this year.


That's a bit of a red flag, IMO, as true R. sinogrande wouldn't normally flower in the first 15-20 years of its life. In North America at least, true R. sinogrande seems to be rather rare. Many plants that are distributed by nurseries as R. sinogrande invariably turn out to be R. sinogrande x macabeanum hybrids. I bought a plant labeled as R. sinogrande from a reputable rhododendron nursery about 15 years back, but I'm now quite sure it's a hybrid. True R. sinogrande has leaves that are more lanceolate: the base of the leaf blade is narrow for quite a ways off the petiole and doesn't reach full width until two-thirds of the way or more toward the tip. The leaves are typically more than three times as long as they are broad at the widest point, and keep getting bigger as the plant grows larger. Many plants of the true form have leaves that have difficulty maintaining adequate hydrostatic pressure against their weight and so the leaves flop down against the stem when soil moisture is anything less than ample. So if you like leaves that are held out nicely at all times of the year, the true species might not even be what you want.

Image

The hybrids have leaves that are more oval in shape and less glossy; the leaf base is much shorter and the leaves get broad quite quickly. Often the leaves are as large as they will ever be on plants that are just four or five years old. They may even get more compact as the plant achieves tree dimensions.

Image


It's dicey to declare criteria that make pat distinctions, however, as even the true R. sinogrande seems rather variable from one location to another and plants grown in deep shade will look different from those grown with some sun (there are almost certainly naturally-occurring hybrids as well). If one wants a true R. sinogrande, it's probably best to get one that is seed-grown from a verified collection-numbered provenance from the wild. Many nurseries have simply passed along "sinogrande" cuttings from plants that they inherited from someone else and now gardens throughout the world are full of hybrids that date back to garden-sourced material from 100 years or more. I think this also what is behind the belief that R. sinogrande seems to be hardier than what much of the literature states...the true form will likely see damage at sustained temps below -8C.


Sat Jul 11, 2015 9:06 pm
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Joined: Tue Aug 05, 2008 12:42 am
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Location: birmingham, UK
Post Re: Rhododendron Sinogrande
Rothschildii is an excellent alternative. Easier to grow. Leaves are large not as big obviously but still give a good affect. The Plant is more suited for a smaller space. It stays a lot more compact. There is a macbeanum alpine form that does not get big in height and also give you large leaves.

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Sat Jul 11, 2015 9:46 pm
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Joined: Tue Oct 30, 2007 8:49 am
Posts: 97
Location: UK
Post Re: Rhododendron Sinogrande
Very interesting post Steve. My larger one's leaves are progressively getting a thinner proportion as each new set is formed, but they're not the same shape yet, as the pic you posted. Time will tell.

In my pic, there's another smaller Sinogrande in the top left. This was bought from a specialist who said it was grown from seed collected on a SBEC expedition. This too, is producing slightly less oval leaves with each set. Interesting to see what happens.

When I Google Sinogrande, leaf shape does seem to vary, even on the same plant.

Flowering before 20 years on a Sinogrande does seem to send out alarm signals.

Great thread. Any more pics welcome :D


Sun Jul 12, 2015 11:27 am
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Joined: Sun Aug 10, 2008 4:02 pm
Posts: 2311
Location: Germany USDA 8b
Post Re: Rhododendron Sinogrande
Interesting, Steve, you seem to be 100% right, regarding sinogrande.

A nursery in northern Germany (where I got my Rh. rex rex from) sells sinograndes, that are field grown :!: there. They state they have survived -18°C, the agency for agriculture of that specific federal state does the same. So I guess, they have a hybrid, at least the plants look like this.

Early flowering is simply made possible by grafting. There are grafts on lime tolerant roots sold as the INKARHO version.

Makes raised beds, peat and such superfluous.


Mon Jul 13, 2015 7:48 am
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Joined: Fri Oct 05, 2012 9:06 pm
Posts: 570
Location: Telford UK
Post Re: Rhododendron Sinogrande
Interesting comments. I got mine from Hardy Exotics in Cornwall. I have looked at the image they use on their site but I am not good at spotting subtle leaf differences. Mine has been in a pot for about 4 years so has not really grown much. Here is a picture:
Image


Mon Jul 13, 2015 11:39 am
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Location: Germany USDA 8b
Post Re: Rhododendron Sinogrande
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.


Tue Jul 14, 2015 11:18 am
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Post Re: Rhododendron Sinogrande
Josh76 wrote:
Got one via mail order from Cally Gardens earlier this year and very pleased with it. A great deal at £7.50 too!

http://www.callygardens.co.uk/

Mmmm that's very cheap, well spotted. :D


Tue Jul 14, 2015 4:52 pm

Joined: Fri Jun 27, 2014 10:34 am
Posts: 101
Location: Lancashire UK
Post Re: Rhododendron Sinogrande
Got one on the way - 5lt......sometime tomorrow

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Wed Jul 15, 2015 9:05 am
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Joined: Tue Oct 30, 2007 8:17 pm
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Location: Scotland
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.


I often go up to Glendoick garden centre.

Most of the stuff in there is just run of the mill garden centre stuff, but they do have a good selection of Rhododendron for sale, albeit not on the same scale as their mail order catalogue.

I was up there a few weeks ago and I saw hodgsonii, sinofalconeri, macabeanum, rex, rex spp. fictolacteum and sinogrande plus others in their sales area.

The sinogrande had particularly large leaves.

It was the first time in 12 years of visiting there that I had seen a hodgsonii for sale. It was calling my name quite loudly, but I managed to resist purchasing it!


Wed Jul 15, 2015 11:41 am
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Joined: Mon May 30, 2016 3:16 am
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Location: Missouri USA
Post Re: Rhododendron Sinogrande
Mo - excellent photos - looks exotic and very intriguing. Sinogrande is another I must add to my wish list.


Tue May 31, 2016 3:28 am
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Joined: Tue Aug 05, 2008 12:42 am
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Location: birmingham, UK
Post Re: Rhododendron Sinogrande
Anne, have a look here. This is an excellent thread

viewtopic.php?f=2&t=7807&hilit=rex

another good thread

viewtopic.php?f=2&t=5699&hilit=abbotsbury

welcome to GOTE


Grenville, If you see this we need an update!

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Mo


Tue May 31, 2016 11:13 am
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Joined: Mon May 30, 2016 3:16 am
Posts: 186
Location: Missouri USA
Post Rhododendron Sinogrande
Mo - thank you for the two threads posted on 5/30/16 - both very interesting. I am still learning the ropes on this blog and just found your post today. Anne
Image


Sat Jun 04, 2016 2:11 pm
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Joined: Mon May 30, 2016 3:16 am
Posts: 186
Location: Missouri USA
Post Rhododendron Sinogrande
Well . . . way back on 5/30/16 I wrote here that I was going to add Rhododendron sinogrande to my wish list.
This morning I ordered a 1-gallon size specimen from Gossler Farms Nursery.
Here is a photo from the Plant Lust site showing sinogrande at Gossler Farms Nursery.
How likely do you think it is that these are true sinogrande?


Will post a photo of the one I receive upon arrival.


Image


Tue May 23, 2017 5:07 am
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