Yarrow Growing Guide Crop Rotation Group Miscellaneous ● Soil Will grow in any soil Position Full sun Frost tolerant Hardy Feeding None generally needed. Companions Lavender, Rosemary, Marjoram, Oregano, Lemon and Stock. Spacing Single Plants: 45cm (1' 5") each way (minimum) Rows: 45cm (1' 5") with 45cm (1' 5") row gap (minimum) Sow and Plant Start with a purchased plant and transplant it from early spring to mid summer. Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area. Notes It is a nutrient accumulator and has a beneficial effect on most plants near it. Harvesting Pick leaves as and when needed for medicinal use. Cut flowers for arrangements. Planting and Harvesting Calendar < Back to All Plants Pests which Affect Yarrow Aphids (General) Slug Snail