How far apart should I plant my shallot starts?
According to Steve Solomon’s Growing Vegetables West of the Cascades (Sasquatch Books, 2007), plant them 3 to 4 inches apart in rows 18 inches apart. Other sources suggest you can make the rows as close together as 12 inches, and the plants as far apart as 6 inches.
Ontario Ministry of Agriculture has a useful page about shallots which recommends 4 to 6 inches between plants.