The licorice plant (Helichrysum petiolare) takes its common name from the faint sweet scent of its crushed leaves, not from any edible root. Gardeners grow this South African native for the visual payoff: cascading stems packed with soft, silvery-gray, woolly foliage that keeps its color from spring through fall. The vigorous, compact shrub works equally well spilling out of containers, trailing over the rim of a hanging basket, or knitting a low ground cover across a sunny border. It tops out near 2 feet tall with a 4-foot spread, and the small creamy-yellow flower clusters that appear in summer and fall draw pollinators without overwhelming the leaves. Treat the planting site like a small construction project: measure the bed, check the drainage, and sketch the layout before you dig. The same planning discipline that guides a major equipment modernization, such as upgrading an asphalt plant drum system, prevents overcrowding and wasted effort at garden scale.
Care Requirements at a Glance
Licorice plants are forgiving, but they reward gardeners who respect a few core requirements. Meet these five conditions and the shrub largely takes care of itself.
- Plant in well-draining soil; standing water is the fastest way to kill the plant.
- Position in full sun, or partial shade where the afternoon sun is especially intense.
- Water to keep the soil evenly moist and never let it turn soggy.
- Avoid high-humidity environments, which encourage rot and fungal issues.
- Amend the planting bed with organic matter before planting.
Why Well-Draining Soil Matters
The root system of Helichrysum petiolare is shallow and sensitive to saturation. In heavy clay, dig in coarse compost or grit at a 50/50 ratio with the existing soil so excess water drains within a few hours of a heavy rain. Raised beds and containers give you the most control over drainage, which is why many gardeners grow licorice plants exclusively in pots.
Like many warm-climate shrubs, the licorice plant may droop briefly in midafternoon heat even when the soil is moist. That rest period is normal and self-corrects by evening, the horticultural equivalent of planned downtime. The same logic behind using plant downtime to improve reliability applies here: a short recovery window keeps the whole plant healthier than constant stress.
Quick Reference Table
Keep these basics handy when you shop for plants or plan a bed.
| Attribute | Value |
|---|---|
| Common name | Licorice plant, herbal helichrysum |
| Botanical name | Helichrysum petiolare (syn. Helichrysum petiolatum) |
| Family | Asteraceae |
| Plant type | Evergreen shrub, often grown as an annual |
| Mature size | Up to 2 ft tall and 4 ft wide |
| Sun exposure | Full sun to partial shade |
| Soil type | Moist, well-drained |
| Soil pH | Acid, neutral, alkaline |
| Bloom time | Summer to fall |
| Flower color | Cream, yellow |
| Hardiness zones | 9-11 (USDA) |
| Native area | South Africa |
Light and Temperature Needs
Licorice plants are light lovers. Give them at least six hours of direct sun for the densest growth and the brightest silver tone. In low light, stems stretch and flop, and the foliage fades from silver to gray-green. In regions with intense afternoon heat, a little shade during the hottest hours keeps the leaves from scorching while still supporting vigorous growth.
Reading Your Site’s Light
Before planting, watch the spot across a full day and record how many hours of direct sun it receives. A north-facing bed that gets morning light only produces a looser, less silver plant than a south-facing one with all-day sun. When a location sits in shadow for part of the day, the techniques for planting a shaded plant bed help you map light patterns and decide whether the site suits a sun-loving species or calls for a shade-tolerant substitute.
Temperature tolerance follows hardiness zones. In USDA zones 9 through 11 the shrub is evergreen and perennial, holding its leaves year-round. In colder zones it behaves as a tender perennial or an annual: enjoy it for one season, or overwinter a potted specimen indoors. Frost blackens the foliage quickly, so move containers under cover before the first freeze.
Choosing a Cultivar
Named cultivars extend the color range beyond classic silver and give you options for different planting jobs.
| Cultivar | Foliage | Best use |
|---|---|---|
| Silver Mist | Dense silver-gray | Containers and edging |
| Limelight | Chartreuse yellow-green | Ground cover and large planters |
| Petite | Small leaves, dwarf habit | Window boxes and small pots |
| Variegatum | Cream-edged leaves | Hanging baskets and trailing displays |
Soil, Water, and Feeding
The licorice plant tolerates a wide pH range, from acidic to alkaline, which makes it a flexible choice for most garden soils. What it will not tolerate is a wet root zone. Improve drainage before planting, then water deeply and less often rather than shallowly and daily.
A Simple Watering Schedule
- In the ground: water when the top inch of soil dries out, roughly once or twice a week during the growing season depending on heat.
- In containers: check daily during summer; pots dry out fast, and a parched licorice plant drops leaves quickly.
- In winter: cut water back sharply; the plant rests and needs only enough moisture to keep roots alive.
For gardeners who travel or simply forget, a drip line on a timer removes the guesswork from the watering routine. The automation strategies that keep drum plant operations efficient scale down neatly to a simple irrigation controller, delivering consistent moisture while cutting water waste.
Feeding for Foliage
Feed lightly in spring with a balanced slow-release fertilizer. Silver-leafed plants need little nitrogen; too much produces soft, sappy growth that flops and loses its woolly texture. One application in early spring, repeated midseason only if growth stalls, is plenty.
Pruning, Mulching, and Maintenance
A licorice plant that never gets pinched grows long, bare stems with foliage concentrated at the tips. Regular pinching keeps the shrub dense and full.
A Simple Pruning Routine
- Pinch the growing tip of each stem back by one-third in early spring as new growth begins.
- Repeat pinching every few weeks through early summer to encourage branching.
- Trim spent flower stalks after bloom to keep the plant tidy.
- Cut leggy stems back by half in midsummer if the plant outgrows its spot; it resprouts quickly.
Mulch finishes the maintenance picture. A 2- to 3-inch layer of shredded bark or compost keeps roots cool, slows evaporation, and suppresses weeds around the base of the shrub. The steps for how to mulch plant beds for healthier soil and better plant growth cover depth, timing, and material choices in detail.
Propagation and Overwintering
Licorice plants root so readily from cuttings that one healthy plant can produce a dozen new ones in a single season, which makes them a favorite for filling containers on a budget.
Rooting Softwood Cuttings, Step by Step
- In late spring or early summer, cut a 4-inch stem tip with no flower buds.
- Strip the leaves from the lower half of the cutting.
- Dip the cut end in rooting hormone powder, then insert it into moist perlite or a seed-starting mix.
- Keep the pot in bright, indirect light and mist regularly; roots form in two to four weeks.
- Pot rooted cuttings into individual containers and grow them on before transplanting.
Starting from seed is possible, but germination is slow and seedlings take a full season to reach a usable size. Cuttings are faster, cheaper, and true to the parent plant’s leaf color.
Overwintering Indoors
In zones colder than 9, lift container plants or dig up garden specimens and pot them before the first frost. Move them to a bright, cool room and cut the top growth back by about a third. Water sparingly through winter and watch for spider mites, which thrive in dry indoor air. Plants moved indoors for the cold months join the same windowsill collection as the dracaena varieties for indoor spaces, where easy care and tolerance of lower light matter more than outdoor vigor.
Pests, Problems, and Companion Planting
Healthy licorice plants rarely attract serious pests, but a few issues show up when conditions drift.
Common Pests and Problems
- Spider mites: fine webbing and stippled leaves, usually on overwintered plants in dry indoor air. Raise humidity and rinse the foliage regularly.
- Aphids: clusters on soft new growth in spring. Knock them off with a strong spray of water.
- Whiteflies: tiny white insects that scatter when the plant is disturbed, common in greenhouses.
- Root rot: wilting stems with soggy soil. Prevention is the only reliable fix, because saturated roots rarely recover.
- Leggy growth: too little light. Move the plant to a sunnier spot and pinch back the stretched stems.
- Leaf scorch: brown, crispy leaf edges in intense afternoon sun. Provide afternoon shade in hot climates.
In containers, the silver foliage pairs well with bold-leafed partners. For partly shaded spots that get morning sun only, coleus delivers dependable color all season, and the coleus plant care guide for shade gardens and containers shows how to combine it with trailing silver plants without crowding either one. In full-sun planters, upright annuals like salvias and zinnias contrast sharply with the gray cascade.