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Rhododendron: Will it flower?

The rhododendron I have was planted by the previous occupant many years ago. We have had it for one year and I don't remember it flowering. It has never been looked after and the branches are old and straggly. Some have a 'bud' or the beginnings of a flower, not sure which. Most have been like this for months and newer ones seem to stop growing when they reach a similar stage. I would appreciate comment/advice please.


  Every contact leaves a trace - Locard

My abode: Essex, soon to be a desert!
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  • FairygirlFairygirl Posts: 55,117
    In order to make potentially healthy buds, rhodos need plenty of moisture in late summer, so it may not have had enough moisture the previous summer to produce any, as I think it was very hot/dry for long periods in the south at that time, and many plants struggled in gardens. The plant concentrates on saving itself for the future rather than trying to flower. Shrubs are more difficult than perennials or annuals in that sense, because problems aren't always related to the immediate situation. 
    If the spring is dry, the same thing can happen - any viable buds will shrivel and not form properly, although that can also happen if frost/ice occurs at the important point.

    You can help it to be reliable in future by just making sure it isn't dry while those flower buds are forming, and also by adding plenty of organic matter from early spring, or even through autumn and winter,  to ensure the soil is kept healthy. That's the most important thing - good soil retains moisture but also drains well. Although rhodos love lots of rain, they don't like being waterlogged. It's why they grow so easily here in the west. Our clay soil is also great for them too, but it has to be well enough amended on planting to ensure that drainage. Once established, it's easier. 
    They're also best with some light shade as that means the ground doesn't dry out so easily, so if it's in a very open, hot sunny site, that will be more difficult. A bit of respite from searing sun will make it happier if it doesn't have that.  :)

    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • Thank you that full explanation. The shrub is in a very poor state and I wondering if with out experience I will not succeed in reviving it. I do not know how to refresh the soil without damaging the roots or whether it needs cutting right back to allow new growth. Maybe best to dig it out and after replacing/refreshing the soil, plant a new shrub.

    Yes it is hot here most of the time and I find the ground is solid and hard to dig even with a fork after a few inches down. It is shaded in the afternoon.

    In fact I am considering removing everything, sorting the soil and starting from scratch now we are established in the property and have more time. I have been unable to find any gardener, even just to pop in, do a bit and offer advice for a fee.
      Every contact leaves a trace - Locard

    My abode: Essex, soon to be a desert!
  • bédébédé Posts: 3,095
    edited September 2023
    The shrub does look a bit dry.  The large buds are flower buds. FRom what I can see they are healthy and should flower next spring.  In my experience rhododendrons are more likely to suffer from drought when the leaves are young and tender; later in the season that can be quite drought-resistant.

    REfresh the soil by each year adding some good acididc compost to the surface around the plant.

    It is not clear from the pic, but there is a small risk that the buds have bud-blast, in which case they may fall off or dry out and be easily removed.  There is plenty of literature on bud-blast.
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • FairygirlFairygirl Posts: 55,117
    Have you got a photo of the whole shrub @theno2soco?
    You won't necessarily need to lift it, and organic matter can be added around it on a regular basis, which won't affect it in any way. An inch or two spread on top, and just leaving a little bit of clearance around the main trunk, is all you need to do.  It'll gradually break down over time.
    They're mostly slow growing too, and vary enormously in their eventual size, but they can also be pruned back which can be beneficial.  :)
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • @bédé, thank you. I have posted a close-up of a 'bud'


      Every contact leaves a trace - Locard

    My abode: Essex, soon to be a desert!
  • @Fairygirl, I have posted a picture of the whole shrub.

    Today I bout some bags of farmyard manure to mix with existing soil when planting, could I put this around the base? It is to late to prune now but how far back to prune it after it has finished flowering next year? Perhaps get rid of all that dead looking wood which just has a flower right at the end.


      Every contact leaves a trace - Locard

    My abode: Essex, soon to be a desert!
  • bédébédé Posts: 3,095
    The latest pic, the plant. really looks quite healthy, with healthy flower buds, not bud-blast.

    Rhosies need litle extra feeding; certainly not farmyard manure.
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • theno2socotheno2soco Posts: 80
    edited September 2023
    bédé said:
    The latest pic, the plant. really looks quite healthy, with healthy flower buds, not bud-blast.

    Rhosies need litle extra feeding; certainly not farmyard manure.
    Rhosies? What/where are they  :o

    Ah! you got me lol. Rhododendrons! I have fed them!
      Every contact leaves a trace - Locard

    My abode: Essex, soon to be a desert!
  • FairygirlFairygirl Posts: 55,117
    Just keep feeding the soil, not the plant  :)
    If the soil is less than ideal in structure [which you  suggested if it's solid in summer and hard to dig anywhere ] then organic matter spread on the beds all year round will do more good than anything else. 
    Any material is fine - manure, compost, leaf mould [that's particularly good] and another useful product if you can get it is composted or ground bark. it all breaks down and helps the soil and therefore helps the shrub. 
    I can't see the stems/branches well enough, but you can certainly take off anything that's completely dead. It may not look very pretty though, and at some point you may feel it's better to replace it, if the overall shape isn't brilliant.
    Some of them can be a bit more gappy in their habit than others, but if the conditions are less than ideal, they often just won't thrive well and therefore lack that good, dense shape, with healthy plentiful foliage. 
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • Thank you @Fairygirl. I was told today how to make leaf mould and its benefits.
      Every contact leaves a trace - Locard

    My abode: Essex, soon to be a desert!
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