When is it acceptable to plant in a straight line?

When is it acceptable to plant in a straight line?

hortense hoelove Humor

Peas in a veg. garden

Dear Hortense Hoelove,

I've been debating about when it is acceptable to plant in a straight line.  Mostly I've been debating with myself so I thought I'd get another opinion. I could think of no one I'd rather have the opinion of than you, Hortense Hoelove, my favorite garden advice columnist.

Sincerely,
Carol

Dear Carol,

I'm so glad you asked about planting in