Helichrysum

Also known as immortelle or everlasting flower, this silvery Mediterranean sub-shrub produces yellow button flowers prized in aromatherapy. Helichrysum essential oil is one of the most expensive and sought-after for skin care preparations and emotional aromatherapy. Grow in full sun with lean, well-drained soil and harvest flower buds just before they fully open.

Helichrysum is best propagated from semi-ripe cuttings taken in late summer. Select 7-10cm non-flowering shoot tips, strip lower leaves, dip in rooting hormone, and insert into a very gritty compost mix. Keep barely moist in a bright, frost-free location. Roots develop in 4-8 weeks. Can also be grown from seed: surface-sow on gritty compost in spring at 18-22°C. Germination takes 1-3 weeks but is often irregular. Cuttings produce more uniform plants.

The Season Plate

Your Helichrysum Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Helichrysum Mar – May, pick Jun – Aug. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – May

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Jul 13

≈ 120 days from sowing · 50-100 flower per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Helichrysum reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Helichrysum, also known as immortelle or everlasting flower, is a compact silver-leaved sub-shrub forming dense mounds 30-50cm tall. Note that this aromatic/essential oil variety is the same species (H. italicum) as the curry plant but is grown specifically for its flowers and essential oil rather than culinary use. Plant in full sun with lean, very well-drained soil.

This Mediterranean native thrives on neglect in hot, dry conditions. Avoid rich soil, frequent watering, or heavy feeding—all of which produce weak growth and dilute the essential oils that make helichrysum so valuable. Sandy, gravelly, or chalky soils are ideal. In cooler climates, plant against a south-facing wall for maximum warmth and reflected heat.

Prune lightly after flowering, cutting back to just below the spent flower heads but never into bare old wood. This maintains the compact, silvery mound shape. In colder areas (zone 7), protect the crown with a deep gravel mulch in winter. Container culture is ideal where winter drainage cannot be guaranteed—use a terracotta pot with a very gritty compost mix.

Helichrysum is a natural companion for other silver-leaved Mediterranean herbs including lavender, santolina, rosemary, and artemisia in hot, dry borders and gravel gardens. The silvery foliage provides beautiful textural contrast with purple, blue, and pink flowers. Plant along paths and borders where the sun-warmed foliage releases its aromatic oils.

The Society Table

Lavender belongs beside it.

Old growers' knowledge, checked against Helichrysum's real companion table below — test any plant you're growing.

Grows well in the company of · 2

LavenderRosemary

Keep apart · 0

no recorded foes

Plant Helichrysum with good neighboursThe planner flags conflicts before they're in the ground

Helichrysum demands the sharpest possible drainage with a pH of 6.5-8.5. Poor, gravelly, sandy, or chalky soils are ideal. Never enrich the soil—lean conditions produce the highest concentrations of essential oils. Mix at least 50% grit into planting holes in average garden soil. No fertilizer is needed or wanted. Container plants can receive a very dilute liquid feed once in spring.

Ideal Temperature

Hardiness Zone Compatibility

Harvest helichrysum flower buds just as they begin to open but before they are fully expanded—this is when essential oil content peaks. Cut flower stems with secateurs, leaving enough foliage below for the plant to regenerate. For dried flowers, harvest when buds are half-open; they will continue to open as they dry. The silver foliage can be harvested sparingly throughout the season for sachets and potpourri.

Storage & Preservation

Hang flower stems upside down in a warm, dark, well-ventilated area to dry. The papery, straw-like flowers are true everlastings—they retain their form and golden color indefinitely when properly dried. Store dried flowers loosely in paper bags or display in arrangements. For essential oil, steam distillation of fresh flowers yields the prized helichrysum oil used in skin care and aromatherapy. Dried foliage retains its silver color and subtle fragrance for potpourri.

Troubleshooting Common Problems

Winter death from wet soil is the primary cause of failure. Ensure perfect drainage or grow in containers that can be sheltered from winter rain. Leggy, open growth means insufficient sun or too-rich conditions. Cutting into old bare wood usually kills that section—always prune to where green growth exists. In humid climates, fungal problems are more likely; extra drainage is essential.

Growing Tips

1. Plant helichrysum in the hottest, driest, most sun-baked spot in your garden. It evolved on exposed Mediterranean hillsides and produces the most aromatic foliage and abundant flowers when pushed by heat and light.
2. Drainage is the single most critical factor for helichrysum. Amend heavy or clay soils with generous amounts of coarse grit, perlite, or sharp sand before planting. Raised beds and rockeries are ideal.
3. Water sparingly once established. Helichrysum is extremely drought-tolerant and overwatering is the most common cause of plant death. Let the soil dry completely between waterings, especially in cooler months.
4. Avoid rich, fertile soil and heavy feeding. Helichrysum produces more aromatic oils and compact growth in poor, lean soil. Excessive nitrogen leads to floppy, less fragrant plants with fewer flowers.
5. Prune lightly in spring once new growth appears, shaping the plant into a compact mound. After flowering, trim back spent stems by about one-third to maintain density and encourage fresh foliage.
6. Use gravel or stone mulch rather than organic bark mulch around helichrysum. Organic mulches trap moisture against the crown and stems, creating conditions for root rot and stem dieback.
7. Propagate from semi-ripe cuttings taken in late summer. Select non-flowering shoots about 8-10 cm long, strip the lower leaves, dip in rooting hormone, and root in a gritty mix of perlite and sand.
8. In regions with cold, wet winters, grow helichrysum in terracotta containers that can be moved to a sheltered, dry position over winter. Terracotta breathes and helps prevent waterlogging.
9. Companion plant helichrysum with other Mediterranean herbs such as lavender, rosemary, and thyme. They share identical cultural requirements and create a beautiful, low-maintenance aromatic garden.
10. Harvest flowers for drying just as the buds begin to open. The papery bracts will continue to unfurl after cutting, giving you perfectly formed everlasting blooms that retain their golden colour indefinitely.