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20 messages
04/06/2014 at 18:26

Please can anyone tell me what is wrong with my Rhododendron?

http://s4.gardenersworld.com/uploads/images/original/48159.jpg?width=277&height=350&mode=max

 

04/06/2014 at 18:33

At the risk of being silly.......if that is one plant have you checked whether the dead half is the result  of having  broken away from the thriving one ? 

I can't enlarge the pic but the difference is so definite.

04/06/2014 at 18:49

It could be a break in the stem to those branches or a break in the bark layer which is exposing the cambium layer and preventing moisture and nutrients flowing up the stems.  It may also be verticulum wilt or simply severe thirst?

Cut off one of the sick stems and check for verticulum wilt - http://www.rhs.org.uk/advice/profile?PID=255    If not that, try giving it a good soaking at the roots to see if that helps it recover.  If not, cut out all the affected stems and give it a feed or liquid rose or tomato food and some sequestered iron to help it recover. 

If the pruned stems do show signs of verticulum wilt you need to remove the plant with as much root ball as possible and destroy it.   Do not plant another rhodo in its place.  Disinfect your secateurs and other tools after cutting and after digging out.

04/06/2014 at 19:11

The problem is that the left hand part is still alive!

04/06/2014 at 19:16

Steve.......that's what puzzled me too.......a break surely ?

04/06/2014 at 19:18

er...that's not what I meant.  The only good rhododendron is a dead rhododendron!

04/06/2014 at 19:28

Steve.........ooops...........whether you love or hate, doesn't it still make you wonder what the problem is ?..............Well, ok....stupid question I guess

04/06/2014 at 19:30

No - not at all stupid.  I'd like to find out too, and then maybe I can use it to get rid of the acres of the stuff in a bit of woodland I help with!

None of which is helping much.  Sorry Bluebell!

04/06/2014 at 19:42

It Looks like a fungal disese called Dieback

Scrape the dead part of the stem with a knife if it is a red discouloration under the bark it is Dieback

04/06/2014 at 19:44

Wild Rhodos have been an ongoing problem in so many areas for so many years.......like the rest of the well intended "pests" be they plant or animal which have been introduced.......Oh, shut up Philippa

04/06/2014 at 20:13

Steve I kind of agree,love to see en masse in a wooded valley but want rid of the 1 in our front garden!

04/06/2014 at 20:16

Other way round with me - ok in a garden but they don't stay there, and take over the world.  And no, Philippa, don't shut up - there are loads of introduced species that disrupt our ecosystems. Rabbits and ground elder for a start.

04/06/2014 at 20:16

And North American tree rats.

04/06/2014 at 20:44

Hmm, vermin with bushy tails.. I think I prefer slugs to squirrels. 

04/06/2014 at 23:00

...and Spanish bluebells and American crayfish and New Zealand flatworms and Dutch elm disease and ....

05/06/2014 at 17:16

steve you seem to be knowledgable on this subject in particular, could the large, purple,mature rhodo in our garden have self spread/seeded a white on a few feet away? it's only a foot or so tall and didn't flower last year, didn't even notice it

05/06/2014 at 17:19

heh heh heh.  It's a good act then.

They certainly spread their seed on the ground (like Onan).  Whether a purple-flowered parent can produce a white-flowered offspring I don't know - it would depend on the genetics of the other parent, if any.

05/06/2014 at 17:28

Steve - I have to agree with you. I've been on so many hill walks that have a long 'start' in wooded areas and they're swamped by Rhodo ponticum. 

I inherited a large rhodie here by the front door, and while it does look quite stunning when it's in flower and has lovely rusty red new growth, I really don't like them. I'm always thinking I might take it out. Can't decide.

05/06/2014 at 17:44

It's fine in China or the Himalayas or wherever it comes from, but we're short enough of native trees here there days without this foreign thug

06/06/2014 at 09:02

i'm going to take mine out, unsure when, want to replace it with a lilac i,ve got ..but that's only 2 foot tall at the mo so may look a bit odd!

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