Large Headed Woolly Yarrow

Many-Flowered Yarrow should be watered often and regularly, and care should be taken to avoid overwatering. During the growing season, it should be watered once a week, with an amount of water slightly greater than the amount of soil in the pot. During the summer, it should be watered a little more frequently, such as every 3-4 days, as the heat and dryness could quickly dry out the soil and cause the plant to become stressed. During the winter, it should be watered less frequently, usually every 2 weeks, and should be reduced as the temperatures drop. It is important to note that soil and moisture should be monitored regularly while watering, as over-watering can lead to root rot and other issues.

Many-Flowered Yarrow (Achillea alpina subsp. multiflora) thrives in full sun and should receive at least 6-8 hours of direct sunlight per day. This species is very hardy and can handle extreme temperatures, so it should be exposed to direct sun in the hottest hours of the afternoon. If possible, it should be kept in a location that is shaded from strong winds, which may disrupt growth and increase the risk of fungal infections. When temperatures cool in the evening, it can tolerate partial shade, either from taller plants or from a dappled canopy of trees.

Many-Flowered Yarrow (Achillea alpina subsp. multiflora) is best pruned in early spring before the new growth begins. Deadheading the old flowers and cutting back after flowering is recommended. Spring is also a good time to reduce the overall size of the plant. Rejuvenation pruning, where the entire plant is cut back to a few inches above the ground, should take place every 2-3 years in late winter. This will promote more vigorous and healthy new growth. Pruning tools should be sharp and sterile to prevent damage or disease transmission.