Are they the same variety? They don't all flower at the same time, regardless of how and where they're growing, even if they're the same variety. The one on the left has flowered and those are just the spent flowerheads. It looks healthy enough. I'm not sure why you think it's dying. If they're staying in pots, compost on it's own won't be enough - you need a soil based medium, which you can get at GCs. If they're staying on the grass, they'll need raised up off it too. They need good moisture, but they also need good drainage, so sitting on turf isn't ideal.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I was hoping to plant them in a border but the soil is showing as alkaline, so I've been digging in lots of ericaceous compost and iron sulfate, not sure if that's the right way to go about it though.
As @Fairygirl says, they’ll need repotting more often if you’ve only used compost, you could mix a bag of top soil with the compost to give a bit more nutrition. You can also buy an ericaceous feed for them. You’ll need to put them on pot feet, or a couple of bricks will do, azaleas don’t like wet roots so make sure the pots can drain. With the one that’s already flowered, you can carefully pick the dead flowers off now, the others for next year will start to form.
Gardening on the wild, windy west side of Dartmoor.
It is almost impossible to change the soil composition in open ground. If your soil is predominately alkaline you will need to change your choice of plants and grow alkaline lovers in the garden and try to keep acid loving plants going in containers. Azaleas like semi shade and moist roots.
I've only had them a couple of months and repotted them shortly after I got them as the pots they came in were rather small. I also added some ericaceous feed when I repotted them and only planted them shallow.
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I live in west central Scotland - not where that photo is...
@Fairygirl ,sorry thought I'd uploaded the image☹️ Both planted in ericaceous compost. As you can see the one on the left looks to be dying.
They don't all flower at the same time, regardless of how and where they're growing, even if they're the same variety.
The one on the left has flowered and those are just the spent flowerheads. It looks healthy enough. I'm not sure why you think it's dying.
If they're staying in pots, compost on it's own won't be enough - you need a soil based medium, which you can get at GCs. If they're staying on the grass, they'll need raised up off it too. They need good moisture, but they also need good drainage, so sitting on turf isn't ideal.
I live in west central Scotland - not where that photo is...
Fairy's advice is friendly, but she obviously knows little about azaleas.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
@Fairygirl, knows plenty about Azaleas, and unlike you does not feel the need to be rude to everyone.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
You’ll need to put them on pot feet, or a couple of bricks will do, azaleas don’t like wet roots so make sure the pots can drain.
With the one that’s already flowered, you can carefully pick the dead flowers off now, the others for next year will start to form.
https://www.rhs.org.uk/soil-composts-mulches/acidifying-soil