Hope there's some water management included and the whole front garden isn't just tarmac...we are in dire need of permeable from gardens more than ever.
The planters definitely have to be a decent size - anything small is pointless. If I was creating some to go along the base of the wall, attached or freestanding, I'd make them around 4 to 5 feet in length, or longer, and around 15 to 18 inches in depth, and about 2 feet in height. That will give a good volume for shrubs, and enough depth for most shrubs and climbers, to enable them to thrive. If they're going to be attached, the fixings will need to be substantial enough to support the containers and the soil/planting. If there's more room, they can be bigger than that, or they can be different sizes if that's the preference. Five would give a good effect, and would allow for varied types of plants too, but it's all about the look that the OP would like, and the amount of time for maintenance.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Have a look at living walls on Google. You could attach wire fencing to the wall, see pic below, and hang planters on it. You can get balcony planters to hang on the fencing, not small flower pots like in the photo - you would be constantly watering. Plant them up with trailing plants like ivy, aubretia, dichondra etc.
Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
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If I was creating some to go along the base of the wall, attached or freestanding, I'd make them around 4 to 5 feet in length, or longer, and around 15 to 18 inches in depth, and about 2 feet in height. That will give a good volume for shrubs, and enough depth for most shrubs and climbers, to enable them to thrive. If they're going to be attached, the fixings will need to be substantial enough to support the containers and the soil/planting.
If there's more room, they can be bigger than that, or they can be different sizes if that's the preference. Five would give a good effect, and would allow for varied types of plants too, but it's all about the look that the OP would like, and the amount of time for maintenance.
I live in west central Scotland - not where that photo is...
You could attach wire fencing to the wall, see pic below, and hang planters on it. You can get balcony planters to hang on the fencing, not small flower pots like in the photo - you would be constantly watering. Plant them up with trailing plants like ivy, aubretia, dichondra etc.