Use wet straw bales covered in netting and tied together to keep things in place ... soaked in liquid manure for things likepotatoes , melons marrows and cucumners both longs and apple types .
If your really going for things they are also good for growing mushrooms but you need to keep the tom cats whole or neutered off and away from then as they have a nasty habit of spraying the stinking straw
Use the spent straw to make browns element of your compost for next year
Carrots such as early Nantee do well in 400 mm ish deep half barrels /tubs in a high level of compost base that is aged or has been used last year so it does not have too much nitrogen in ..don't forget to make a small 19 mm drain hole about 30 mm up the side from the bottom to let excess water out .
You can also grow all letttuces , spring onions ,radishes mooli , beet roots in deep tubs as well so long as you don't let them dry out , feed thn liquid manures as well but don't get the feed onthe crop if your using a bacterially live feed such as manure tea lest you & your family end up with ecoli probs.
I've got Goji berries going in outside containers ( first year ) at the end of May , not yet sure if I'll use cut in half barrels or two spare adapetd 15 gallon header tanks