How to grow strawflower
Overview
Strawflower (Xerochrysum bracteatum) is a herbaceous perennial often grown as an annual, prized for its papery, long-lasting flower heads in bright gold, orange, pink, red, or white. It is a daisy from the Asteraceae family that thrives in full sun and well-drained soil, making it an excellent choice for filling gaps in beds and adding seasonal colour to native-style or cottage gardens.
Varieties
- Golden Bunch — A compact, golden-yellow variety ideal for pots and borders, flowering continuously from spring to autumn.
- Pink Beauty — Soft pink bracts with a darker centre, excellent for cut flowers and dried arrangements in Australian gardens.
- Red Flame — Vibrant red-orange flowers that hold colour well when dried; a standout in native-style beds.
Soil Preparation
Strawflower prefers slightly acidic to neutral soil (pH 6.0–7.0) with excellent drainage. Before planting, work in 2–3 cm of well-rotted compost or coarse sand to improve aeration. Avoid adding lime unless soil is very acidic; in heavy clay, raise beds or use a gravel mulch to prevent root rot.
Growing Guide
Plant strawflower in full sun with free-draining soil; avoid heavy clay or waterlogged sites. Space plants 25–30 cm apart to allow good air circulation. Direct sow seed 3 mm deep in spring (temperate) or autumn (subtropical) after the last frost, or transplant seedlings when 10 cm tall. For a longer flowering season, stagger sowings every 4–6 weeks. In hot climates, provide light afternoon shade to prevent scorching of blooms.
Sowing
Sow seed 3 mm deep in seed-raising mix, spacing 2–3 cm apart. Germination takes 7–14 days at 18–22°C. Direct sow is easiest, but transplanting is fine if seedlings are handled gently. In cool zones, start indoors 6–8 weeks before the last frost.
Care
Feed monthly with a balanced liquid fertiliser (e.g., 10-10-10) during the growing season. Deadhead spent flowers regularly to prolong blooming; after the first flush, trim back leggy growth by one-third to encourage bushiness and more flower stems.
Companion Planting
Strawflower pairs well with statice (Limonium sinuatum), lavender, and kangaroo paw for a long-lasting cut flower display. Avoid planting near moisture-loving plants like impatiens or ferns, as strawflower prefers dry conditions and may rot if overwatered.
Common Pests & Risks
Aphids and caterpillars may attack strawflower, especially in humid weather. Control aphids with a strong water spray or neem oil; treat caterpillars with Bacillus thuringiensis (Bt) if infestations are heavy. Powdery mildew can occur in poor air circulation – space plants adequately and avoid overhead watering.
Harvesting
Harvest strawflower stems when the outer petals (bracts) are fully open but before the central disc becomes fuzzy. Cut early in the morning and place in water immediately; for dried flowers, hang upside down in a dark, airy space for 2–3 weeks.
Troubleshooting
Yellow leaves: overwatering or poor drainage – reduce watering and improve soil aeration. Brown edges on petals: sun scorch in extreme heat – provide light afternoon shade. Leggy growth: insufficient light – move to full sun or pinch back stems. Stunted plants: root-bound in pots – transplant to a larger container or garden bed. Powdery mildew: poor air circulation – space plants wider and avoid wetting foliage.