Boxwood window box

[Notfeelinglikemyselftoday]

I can find loads of fake ones but no advice on how to plant a real boxwood window box

Is there a special variant I should buy, soil etc? I have a large metre long, 15cm deep window box that I want to look like this eventually

Or is there something better? I want low maintenance. I've just managed to neglect and kill the huecheras I had in there all year round after 2 years

Box will be eaten by box caterpillars or killed by box blight within a few years. Better to go for something else which looks similar. Not sure which variant would be best in a window box?

Generally though I don't think window boxes are low maintainence because they dry out so will need watering once a week in summer.

Fake plants might be better?

I don't think any real plant will be truly low maintenance to be honest, given the hot summers we've been having recently anything planted in a container will need regular watering. If you don't mind the regular watering I'd stay away from box plants, as @Geneticsbunny said its become incredibly high maintenance what with box blight and box caterpillars in the last few years. I'm a keen gardener and even I couldn't be bothered with the faff of box plants!
There's an office near me that has dwarf euonymus in their window boxes, which looks incredibly smart. You can get varieties specifically marketed as alternatives to box, they don't grow too tall and they have an upright manner meaning they keep their shape nicely. It's a lovely, generally trouble free plant. I'd use compost specifically formulated for containers that has water retaining crystals (or add your own), such as this. As a bare minimum for any plant grown in a container you'll have to add slow release fertiliser at the beginning of the season and water regularly to keep them looking good though.

I was going to suggest euonymus too. I had a long container similar in size to a window box which I planted up one winter with pansies and small daffs (tete a tete) and three or four small euonymus being sold for that sort of purpose - I don't know the variety, the colour was like 'green and gold' but the leaves were smaller.
I left them in, replacing the pansies as needed until eventually there wasn't room for any.

I watered it occasionally when I did other pots in dry spells but it didn't need much attention.
So maybe try something like that?

Boxwood caterpillars are destroying my box hedge and I have to spray at least monthly even though supposedly they have ‘only’ three cycles a year. I wouldn’t recommend box, sadly.

The RHS did a trial on box substitutes, I’ll see if I can find a link.

this article is about box blight but lists good alternatives to plant.

https://www.rhs.org.uk/prevention-protection/box-blight-keeping-it-out

Bloody knew MN would deliver thank you! Great info and ideas.