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Help! My Hydrangea Sargentiana, Viburnam Plicatum and Olive are all sick... how do i cure them? Posts: 24
edited July 2018 in Plants
My  Hydrangea Sargentiana's leaves wilted and are dying. See attached pics. Is this is a disease?

What's odd is the 4 feet away, my Viburnam Plicatum is also now having brown streaks on leaves, and has dropped a bunch of leaves.

And then the anenome japonica just wilted and died.

And my olive (in a pot) has dropped its leaves.

What's going on? I'm a bit desperate. It's a small london garden, south facing, watered well. But is one disease killing them, or is it more than one??




  • FairygirlFairygirl Posts: 52,151
    They're  probably bone dry. Lots of plants around the UK are like that.
    Big shrubs like Viburnum and Hydrangea  will drop leaves now and again anyway -[ as do all evergreens] even in normal conditions, but this year isn't 'normal conditions'. The lack of rain means they're struggling to stay hydrated, and they shed foliage to make it easier. 
     Even here, we've had abnormal heat, and shrubs are shedding a bit more than the norm because they're a bit stressed - and we've had rain, and cool mornings for most of the spring, so nothing like many other parts of the UK. 
    The brown bits are just where they've had a bit too much hot sun. 
    The olive will benefit from being soaked thoroughly - when soil gets dried out, any water just goes through rather than being absorbed. In a pot, it's even harder to remain well hydrated. A saucer or container of some kind under it,  until it drinks up a decent amount of water will help. 
    That's my take on it anyway!
    It's a place where beautiful isn't enough of a word....

    I live in west central Scotland - not where that photo is...
  • hogweedhogweed Posts: 4,053
    Are they all in pots? or in the ground?
    'Optimism is the faith that leads to achievement' - Helen Keller
  • Posts: 24
    Just the Olive is in a pot. The rest are in well composted earth, which is watered pretty much every day...

    the sargentiana is planted next to a north west facing wall, the viburnum next to a west facing wall. The olives face south in pots. 
  • BorderlineBorderline Posts: 4,699
    How long have the Viburnum and Hydrangeas been in the ground? Both plants are usually better suited in cooler damp conditions. If only planted less than 2 years ago, then they are still vulnerable to the heat, and the roots are not fully formed. They will need deep watering, not a quick water. At least two to three buckets for full on each shrub if quite mature.

    The leaves look like scorching either by excessive sun or damage from possible over hanging tree. They don't look like damage from pests. Make sure watering is done when it's very late in the evening or very early in the mornings to avoid possible splashing on leaves when the sun is out. But most of all, your plants have time to soak in the water better in cooler temperatures.

    Olive trees can shed leaves and go through a cycle of renewal through the year. They too also need a good soak all the way through, but will cope with larger gaps without watering. 
  • Posts: 24
    Oh that’s interesting. thank you!
    the viburnum was planted this year, from a 30l ? Pot. 

    But the sargentiana was replanted this year. I planted it in this spot 2 years ago (it didn’t love it), replanted it to the other side of the garden (more shady) last year where it did better, and then planted it back to here this year (a more empty bed) - and now it’s v unhappy. 

    So it’s a water issue, you think? 
  • BorderlineBorderline Posts: 4,699
    After reading about the size of pot for the Viburnum and the moving around of your Hydrangeas recently, I'm pretty certain, your shrubs are very vulnerable at the moment, and it is a watering issue.

    Larger sized shrubs don't transplant easily and take a lot longer to settle in their new surroundings. In this extreme heat, I think it is better you lop down some of the spindly  growth on your Hydrangeas. They will do better next year. Continue to water, but only in the evenings or early mornings. Water deep into the root areas. 

    With your Olive tree, you can prune them a bit throughout the warm months, that usually encourages more branching and hopefully give your shrub a more denser coverage.
  • Posts: 24
    Thank you all very much. I just went out and watered for 45 minutes.
    I'll prune the sargentiana back - it was too leggy anyway. and give the olive a haircut.
    Hopefully they will recover. 
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