Probably better for the lavender they’ve got in it, that will thrive on poorer soil with no feeding. Sweet peas are hungry plants,, maybe you could put 3 plants in there, 6” apart.
Gardening on the wild, windy west side of Dartmoor.
8inches/2ocm isn't very deep, so it's unlikely they'd thrive very well, although there are some dwarf varieties which can apparently be grown in hanging baskets. If you're fussy about colour they wouldn't be ideal as they tend to be pastel pinks etc. They'd need a lot of food and water in that wee trough, so wouldn't be great for the usual, tall varieties. I never use anything shallower than at least ten inches or so, and that's for a new shorter one which only gets to around 1 metre. Most of mine are in containers that are at least 15 inches in height. Manure and good garden soil [or turf] in the bottom, good compost, and plenty of slow release food at the start of the season, followed by additional food from around now. Tomato food is ideal at that stage. If you want to grow sweet peas, it's better to buy a suitable container, rather than trying to make them fit something unsuitable.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
(H)22 x (W)45 x (D)20 cm
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Sweet peas are hungry plants,, maybe you could put 3 plants in there, 6” apart.
They'd need a lot of food and water in that wee trough, so wouldn't be great for the usual, tall varieties. I never use anything shallower than at least ten inches or so, and that's for a new shorter one which only gets to around 1 metre.
Most of mine are in containers that are at least 15 inches in height. Manure and good garden soil [or turf] in the bottom, good compost, and plenty of slow release food at the start of the season, followed by additional food from around now. Tomato food is ideal at that stage.
If you want to grow sweet peas, it's better to buy a suitable container, rather than trying to make them fit something unsuitable.
I live in west central Scotland - not where that photo is...
But a bit late for 2023.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."