Borage reaches heights of 2 to 3 feet (0.6-0.9 m.) and the taproot is long and sturdy. Therefore, potted borage plants need a sturdy container with a depth and width of at least 12 inches (31 cm.). ... Keep in mind that because of its long taproot, borage doesn't transplant well.

How much space do you need for borage?

Planting depth: Sow borage seeds ¼ to ½ inch deep. Spacing: Thin plants from 18 to 24 inches apart once they are 6 to 8 inches tall. Space rows 18 to 24 inches apart.

What does borage do to soil?

Using borage as green manure allows the nutrients brought up by the plant's deep taproot to be dispersed into the upper areas of soil when the plant composts. Borage returns high nitrogen to the soil when it is tilled back in. The result is healthy soil, rich in nutrients and deeply aerated earth.