Planting Garlic in Autumn? Here are some useful tips. In this video Andrew talks about how to choose the right clove to plant, shows the planting spacing and depths needed and explains the advantages of growing inside - either in a polytunnel or greenhouse. 🧄You can plant garlic any time between the end of September and the end of February the following year, but autumn-planted garlic will give you the biggest bulbs. 🧄 Since garlic will be in the bed for the winter and most of spring it will h