Spinach!
there is a 7 letter vegetable that contains the letters a,b,c,d,e,f,g. the vegetable isCABBAGE
bib lettuce green beans green onion red cabbage red peppers Swiss chard watercress
Beetroot
Tomato it the vegetable that has the longest amount of letters and seedy it ain't a fruit there ain't no fruit nor veggie that's seedy, that has 7 letters
Stranger
Treddle
ammonia
Loafing shed.
nonagon
Lioness
ramekin
I can only think that it would be Mexican