15 messages
31/05/2013 at 15:00

Hi everyone, 

I am loving this forum so far - everyone is so knowledgeable! I was wondering if I could throw another quesiton at you all, this time about a 3 year old Rhododendron Madame Masson. (photo below).

I bought this 3 years ago, planted it in ericaceous compost in my garden and pretty much just left it alone. I guess I needed to have given it more attention over the years, because it looks pretty bad now with holes in most of the leaves. And this year it just isn't flowering even though it seems to have flower buds everywhere. 

Does anyone have any advice on how to save this plant? Are the holes from slugs? And should I remove the flower buds if they don't flower?

Thanks!

http://s4.gardenersworld.com/uploads/images/original/24448.jpg?width=272&height=350&mode=max

 

31/05/2013 at 16:07

Have you been feeding the plant?  Because it's in ericaceous compost, you need a specialist feed.  I'd try that, your plant will look and feel better for it.  Not an expert, but I think you need a sequestered Iron feed, and if you water it, use rainwater, not tap water, especially if you're in a hard water area, as hard water contains calcium carbonate, which is alkaline, which won't do your plant any good.

I'm not sure which pest is causing the holes in the plant, but I don't think it's slugs, as rhodos have quite tough, leathery leaves, which I would have thought to be a bit to chewy for a slug to have a go at (again, I could be wrong).

I think the flowering has just been delayed this year due to the really cold start to the year.  Daffs are normally well and truly over by this time of year, I still have some in flower.  I'd feed it, and leave it, it should burst into flower pretty soon.  I'm sure someone else could suggest a culprit for eating the leaves (caterpillars maybe?), have you had a good look around, especially underneath the leaves, to see if anything is lurking there?

31/05/2013 at 16:19

Thanks Mummy Muddy Paws. I was trying to be clever and yesterday put a sequestrene feed on the plant, but mixed it up with tap water and I live in a very hard water area - oops!

I guess I will just have to see what happens. Fingers crossed the flowers come out, but I'm not holding my breath...

I will look around for some caterpillars, you could be right about that. Thanks again for your advice!

31/05/2013 at 16:34

I can't enlarge the picture but the holes you mention look like vine weevil damage.

01/06/2013 at 11:39

Oh dear! Vine weevils? I think you might be right having just examined the leaves more closely.  Is there a dog and child friendly way to get rid of vine weevils? Thanks!

01/06/2013 at 12:45

Nematodes are a safe way to control vine weevils, if that's your only plant being attacked you could go out with a torch on a warm evening, and try to catch any vine weevil on the plant.

01/06/2013 at 17:57

Slugs and snails don't really go for rhodies and vine weevil only really nibble round edges. There is a viburnum beetle but not sure if it attacks rhodies as well. 

Is it in a sunny dry site Cheryl? They do prefer damper, shadier positions and are pretty robust if in the right conditions. If it's in a hot site I'd move it and give it a good watering in, mulch it with bark and see how it gets on.

01/06/2013 at 19:31

Not all my rhodies are out yet, everything is about a month behind this year.

I can't look closer at the picture, but from what I can see they could just be healthy buds that aren't out yet. If they'd failed to open I'd guess they'd probably just shrivel up & drop off. 

Don't know about the leaves I'm afraid.

07/08/2013 at 11:39

my rhododendron is the same but flowered well

08/08/2013 at 09:07

hi there just a update last night i had a look again at my rhododendron new shoots that had just opened that day were munched oh ++++++. on close looking i found on underside of leaves tiny 3 to 5 mm catapilers promply sprayed.i have been looking for culpit for about 4 weeks

08/08/2013 at 12:55

Very same thing has happened to my small rhododendron plant.  Every time time I look at night I cannot see anything (probably spot me with my torch and hide!!).  I am certain it is not slugs or snails.  I have a hypericum next to eat which has been well eaten by leaf cutters but never see them either!   My taller rhododendrons are doing very well with small signs of leaves being eaten but they flowered very well this year.

I don't want to kill our wildlife, especially caterpillers and not that precious about my plants so will not use slug pellets (am sure do more harm than good).  Nematodes have been mentioned - is this a pellet or in spray form?  Will it kill caterpillars?

Now and again I collect slugs and snails and take them to a nature reserve as won't kill them but I tend to leave the caterpillars. (Hoping the birds will get the little cabbage white ones at least but not sure they do?). .

 

09/08/2013 at 08:58

hi and thanks for the replay.

to your ? about Nematodes it is a powder that is put in a watering can or sprayer and watered onto the gound or sprayed they are tiny micros that live in the soil and kill sertain bugs eg slug eggs and there fore help to control them.As for the rhododendron if the plant is ok and you dont mind the holes then leave it but you mite not get flowers next year if they eat the new flower buds now forming.i think better to have flowers to feed the butterflys in summer and let them lay eggs someware eles.

09/08/2013 at 09:52

Changing the subject slightly, can you prune a rhododendron.  I have a very large one in  very large pot that igetting woody and not flowering on a regular basis

09/08/2013 at 13:50

Help please! bought a beautiful small rhododendron from the local nursery earlier this year which flowered profusely. However, since the the flowers have died and the new shoots have gained growth ALL the old leaves have turned brown and dropped off leaving the original stems bare. The plant now looks very straggly and even some of the new shoots are struggling to survive. The plant is in a pot with ericaceous soil so I don't know what I have done wrong. Any advice most welcome   

09/08/2013 at 16:36

I have a rhododendron which is a small variety. It was in a pot but not doing well so planted it out. Since then it has done much better but the only thing I found in that long dry spell is the leaves turned yellow and fell off. I watered profusely over several days (hard tap water though as it's too far for me to carry a can!) and it has recovered beautifully. New leaves etc. it previously flowered well so obviously was just thirsty! I know they don't love too much sun and it doesn't get it but obviously not enough rain either this year.

PS Nemaslug every six weeks is fantastic in veg beds.

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