Garlic will be fine outside, I planted mine outside at the end of October, and this is England. You will want something 25 cm deep, or a bit more, and keep them about 15 cm apart, or just over. I say 'A bit more' and 'Just over' because most plants will pay you back if you give them something a bit more than the minimum, and they like good, rich soil that is a bit alkaline.
Dear Internet Friend and Mentor Oliver Buckle,
I hope this message finds you firm and steady!
I am writting to you because I have found some life form feeding on my mint plant.
Do you have a solution?