Help for gardening quiz please

[Suetheramble]

Plants in the Labiatae plant family (including sage, Salvia, Lavender,mint,coleus,nettles etc) can generally be distinguished by which characteristic common to them all. 1 - The stems have squared corners. 2 - The flowers are all shades of blue or purple. 3 - They are all poisonous to cattle Thanks for any help

[Thunderbird+]

I would say the first one is correct.

[Suetheramble]

Thank you

[ORAC60]

answer B would be correct