When to plant
Plant in spring after last frost. Perennial in zones 4–9. Extremely drought-tolerant and heat-tolerant once established. Excellent ornamental plant for dry gardens with its distinctive silver foliage. Rarely needs dividing or replanting once established. Long-lived and low-maintenance.
Soil & site
Poor to average, very well-drained soil. pH 5.5–7.5. Does not need or want rich soil — excessive fertility reduces the bitter compounds that are the plant's defining characteristic. Thrives in dry, rocky, or gravelly conditions. Full sun is essential.
Feeding
No fertilizer needed or desired. Grows as a roadside and wasteland plant in its native range — it is perfectly adapted to poor, unfed conditions. Rich soil produces large, unattractive plants with diminished potency.
Common problems
Very few pest or disease problems — the bitter compounds deter most insects. Root rot in poorly drained or overwatered soil. Can spread by root division. Allelopathic to many nearby plants (roots and leaching rain wash inhibitory compounds into the soil). Plant away from vegetables and other herbs.
When to harvest
Harvest leafy stems just before or during the early flowering stage for maximum essential oil content. The silvery-grey leaves should be healthy and vigorous. Morning harvest after dew dries is best. The plant has an intensely bitter, medicinal aroma — this is a sign of quality and potency.
How to harvest
Cut stems 4–6 inches from the tips using sharp scissors or pruners. Take no more than a third of the plant at once. Dry in small bundles hung upside down in a warm, airy, dark location — direct sun bleaches the silvery leaves. Or dry flat on screens. Fully dried material should be stored immediately in airtight jars.
Storage & use
Dried leaves and stems: store in airtight jars for up to 1 year in a dark, cool location. Used historically as a bittering agent in vermouth and absinthe. Avoid internal use without expert guidance — thujone (a component of the essential oil) is toxic in significant quantities. Used externally in insect-repelling sachets and companion planting applications.
Useful for growing wormwood
A few things that make this one easier — chosen for this plant, not a generic list.
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