In article , Max Wright
writes
According to the Organic Gardening Catalogue, their wild rocket is
Diplotaxis tenuifolia, not Sisymbrium officinale (but it's also known as
Sisymbrium tenuifolium, according to www.scs.leeds.ac.uk - just Google
"diplotaxis"). It's a perennial and "doubtfully native" in Britain,
rated a noxious/invasive weed in various parts of Australia. I've had
it in my garden for about 3 years.

There's also another wild rocket, Diplotaxis erucoides; this one is an
annual and (according to the same source) a serious weed in southern
Europe.

I believe the normal cultivated annual or "salad" rockets are Erucas -
allegedly introduced to Britain by the Romans. So perhaps the annual
wild rocket's name means "not actually a rocket but rather like one".

I suspect it's just to sound trendy, like 'wild mushrooms' or 'wild
rice'
--
Kay
"Do not insult the crocodile until you have crossed the river"