Grobags?
When I lived in the UK, I grew tomatoes in them.
They were neat bags of potting mix & compost and you just slit them down the middle and popped your vegies or flowers in.
Now it seems, you can even plant children in a Grobag 
Seems it’s now Harry’s uncle - the Earl of Spencer - having his turn at a “tell all” book.



and told me that back in her day 1930s, babies were put inside cages way up high outside tenement windows, to get maximum sunlight , to prevent rickets and TB.