I agree with Fairygirl there. It's more important your newly planted shrubs have stable temperatures whilst it settles and establish, so a thick mulch will help that. Watering especially in the first few years over the dry months will be the priority to help them through. Watering in those months should be generous. In my experience, there is no need to put any feed for shrubs if you have added well rotted manure or compost it is more than enough. Only feed them if you see signs of poor growing or leaf yellowing.
They should be fine this year. Next year you can scatter a fertiliser of your choice around the plants and the rain will help it drip down into the soil . BF&B or pelleted chicken and/or cow manure work for me. Unlike Growmore, they feed soil microbes too and do not involve the petrochemical industry.
You can occasional liquid feeds too - rose and tomato feeds or seaweed as you see fit.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Thanks for that everyone put my mind at rest. She has some DA roses and a beautiful magnolia Stellata amongst others and I wanted to be sure they got the best possible start. Thanks again!
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I live in west central Scotland - not where that photo is...
You can occasional liquid feeds too - rose and tomato feeds or seaweed as you see fit.