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Dianthus and salvia not flowering

Hello everyone, 
I'm a relatively novice gardener. I bought 4 x Dianthus back in May, one is doing very well but the other three are growing buds which then seem to either shrivel and die or die from the inside. I've tried slug and snail repellent and a general pest repellent spray, I've cut all of the dead heads off before but they just seem to regrow new flower buds that die.
I bought a Salvia Viola close at the same, which after its initial flowering, I deadheaded and could see new shoots at the base of the previous spires. These have also all dried and died.
I've also given the flower bed a boost with some compost and top soil mix and Miracle Gro.
Really look forward to some advice.
Thanks
Gemma

Here is a photo of the Dianthus buds:

Posts

  • FairygirlFairygirl Posts: 55,117
    Are they in suitable soil? They generally need alkaline to neutral soil.
    They look very small plants though. They like free draining soil, but all plants need well watered until established. The salvia is the same. Not all salvias will re flower anyway after the initial show.
    Dianthus do sometimes produce empty buds, often early in the year or when they have too many to sustain, and they can just be removed,  but spraying them isn't advisable unless you know what the problem is. 
    Birds will sometimes eat buds too, and they look as if they've been eaten. Too many slug pellets will actually attract them, not deter them. 
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • LynLyn Posts: 23,190
    The green pods in the dianthus look like  seed heads, they’ve already flowered.  If you pull one apart you may see the seeds in there. 
    I would cut off all the buds and seed heads for this year that will give the plant time to root and get established. 

    Gardening on the wild, windy west side of Dartmoor. 

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