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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.GROWING REQUIREMENTSPESTS & DISEASESBorage plants are susceptible to pests like the Japanese beetle or aphids which can be managed easily with some neem oil spray. In addition, root rot or fungal diseases can affect your borage plants in wet soil. Hence, it is important to have proper drainage at the growing site.SOILBorage grows best in soil that is rich in organic matter with a pH ranging between 6.0 to 7.0.SPOTGrow borage in a location that receives direct sunlight for 5-6 hours during the day.TEMPERATUREBorage seeds will germinate well in temperatures ranging between 20 to 25°C.WATERINGWater borage seeds and seedlings regularly until they are well established. Once the plant is about 6-8 inches tall, the watering can be reduced to once in two days.