Does anyone know when one should use "notre" vs." "nos"?
Notre is singular, nos is plural. Since you're discussing "légumes", and "vegetables" is plural, you need everything that describes the vegetables also in plural form.
Eg: nos légumes dans notre jardin.
Is ‘mauvaises’ not a word?
'Mauvais' is singular as well as plural
I thought mauvais meant bad in an evil sense, not bad in a gross or repugnant way
I believe 'bad' as in evil is 'méchants'
Whats wrong with 'Nos légumes sont mal'?
Mal is the adverb version of mauvais, similar to bon and bien.
When do we use sont,somme and etre .What are some basic differences?
Etre means "to be. Sommes, etes and sont all mean 'are' - the difference is in what pronoun you use them with: nous sommes = we are; vous etes = you are (plural or polite); ils/elles sont = they are.