Hi Jackie, well it is possible but a little unlikely that the application of herbicide some two weeks before the plants were put in is having an adverse impact on their health. Try to find out just what herbicide was used then you'll have a clearer idea if it is the culprit.
I write that it unlikely because unless the person applying the herbicide was creating localised pools of poison over existing roots its residual effects however slight should have been fairly uniform throughout the bed, not what you describe. By the sounds of it you did prepare the bed well with compost, trusting that it was well broken down not still hot? The bone meal should not produce such negative effects on plant health, so it doesn't leave many other possibilities.
The Sorbus cashmiriani Kashmir mountain ash or rowan is very attractive and grows well in quite a wide range of environmental conditions. Where abouts are you UK, USA? and what has the weather been like recently? (after the plantings) The possible causes for the symptoms you describe are many, if you can post some photos of the garden bed and the plants both those growing well and those suffering, maybe we can get a better idea from those as to what ails your new garden plants.
__________________ Sean  Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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