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Dwarf Pinus Mugo - Dead?

Can anyone advise why my two dwarf pinus mugos which I planted only a couple of months ago have gone brown with only a little green at the top of the plant. Are they dead?0
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Have you been watering them regularly? They need a lot until properly established, which takes a long time.
Planting in summer is always more risky because of lack of water, especially in drier parts of the country.
Something's been digging next to the 2nd one too, which won't have helped.
I live in west central Scotland - not where that photo is...
If you planted them only a couple of months ago and you prepped the soil well and kept watered, it could just be a case of a bit of a shock for them and they will need time to establish properly. There looks to be a fair number of other plants surrounding which may result in a bit of competition for a new plant
Pines of any kind need quite decent soil, with enough leaf mould or organic matter in it to sustain them. I'm not sure I'd ever plant one in a rockery environment, unless there was suitable peaty soil and enough water on a regular basis - rainwater.
If it's under a canopy of other planting, that will affect it too.
There may have been other reasons for the Acer failing, but it's very hard to judge from a couple of photos unfortunately. Pines would normally like similar conditions to Acers, but the soil structure and the drainage are important for both.
It could well just be a bit of transplant shock as @philippasmith2 says.
I live in west central Scotland - not where that photo is...