How to grow shasta daisy
Overview
Shasta daisy is a clump-forming herbaceous perennial grown for its large, white-petalled blooms with yellow centres. It is a classic cut flower and pollinator magnet, best suited to full sun and well-drained soil.
Varieties
- Snowcap — Compact, early-flowering variety ideal for pots and borders in Australian gardens.
- Becky — Tall, robust stems perfect for cut flowers; tolerates heat and humidity well.
- Crazy Daisy — Double-flowered with fringed petals; a favourite for cottage gardens in temperate zones.
Soil Preparation
Shasta daisy prefers neutral to slightly acidic soil (pH 6.0–7.0). Add lime if soil is very acidic. Improve drainage with coarse sand or grit if planting in heavy clay. Work in 5 cm of compost before planting.
Growing Guide
Plant Shasta daisy in full sun with good air circulation. Space clumps 30–45 cm apart. Prepare soil with compost or well-rotted manure before planting; keep soil consistently moist but not waterlogged. Divide clumps every 2–3 years in early spring to maintain vigour.
Sowing
Sow seeds 3 mm deep, 15 cm apart, in seed-raising mix. Germinates in 10–14 days at 18–22°C. Transplant when 4 true leaves appear. Direct sow is possible but slower; best started in punnets.
Care
Feed with a balanced slow-release fertiliser (e.g., 10-10-10) in early spring and again after the first flush of flowers. Deadhead spent blooms weekly to encourage repeat flowering. Cut back all foliage to ground level in late autumn for a tidy winter dormancy.
Companion Planting
Grow Shasta daisy alongside lavender, echinacea, and salvia for a pollinator-friendly border. Avoid planting near aggressive spreaders like mint or bamboo, which will compete for root space.
Common Pests & Risks
Aphids cluster on new growth; spray with neem oil or insecticidal soap. Leaf spot (Septoria) appears in wet weather; improve air circulation and remove affected foliage. Slugs and snails may damage young shoots; use iron-based bait or hand-pick at dusk.
Harvesting
Cut stems when flowers are fully open, early in the morning. Strip lower leaves and place in clean water immediately. Blooms last 5–7 days in a vase with regular water changes.
Troubleshooting
Yellowing lower leaves: overwatering or poor drainage—reduce water and improve soil. Brown leaf edges: sun scorch or salt buildup—move to partial shade or flush soil. Stunted growth: congested clump—divide in spring. Powdery mildew: humid air—increase spacing and apply sulfur spray. Flowers fail to open: aphid damage—spray with neem oil.