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The taproot of a borage plant can not tolerate transplant shock. Hence, it is advised to grow borage directly in the ground or container outdoors. Sow borage seeds at a depth of ¼ inches in soil mixed with aged compost. The borage seeds will start to germinate in 15 to 20 days in ideal growing conditions. Pumpkins, basil, kale, marigold and leeks are the best companion plants for borage plants.