agapanthus
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Agapanthus: How to Grow Lush, Flowering Lily of the Nile in Australia
Agapanthus are hardy, drought-tolerant perennials famous for their strappy green leaves and bold blue or white globe-like flowers. Whether grown in garden beds or pots, the secret to vigorous blooming is correct fertilisation and trimming. This guide covers everything from planting and pot care to propagation and feeding.
Agapanthus Basics: Growth Habit and Ideal Conditions
Agapanthus thrive across most Australian climates, from coastal Sydney to inland Victoria. Native to South Africa, they’re low-maintenance plants that tolerate heat, poor soils, and dry spells.
- Height: 50cm–1.5m depending on cultivar (dwarf or giant)
- Flowers: Large umbels in white, lavender, or deep blue
- Bloom Time: Late spring to midsummer, with some reblooming into autumn
- Light: Full sun to part shade (flowering is best in sun)
- Soil: Free-draining soil, pH neutral to slightly acidic (6.0–7.0)
Planting Tips:
- Space plants 30–60cm apart to allow clump formation
- Plant crowns just below soil surface with roots spread flat
- Water in well with diluted CompleteGrow NPK 20-20-20 to reduce transplant shock
- Use bark mulch or stones (not compost) to suppress weeds and regulate soil moisture


Agapanthus in Pots: Container Care and Propagation Tips
Agapanthus do well in containers, especially dwarf or compact forms like ‘Baby Pete’ or ‘Snowball’. Choose a pot at least 30cm wide with drainage holes.Container Growing Tips:
- Use premium potting mix blended with NPK 4-18-38 with Cal-Mag for flower production
- Place in a sunny position (6+ hours of light)
- Water deeply but infrequently, letting surface dry out slightly between waterings
- Feed every 2–3 weeks during spring–summer with diluted NPK fertiliser
Propagation from Seed:
- Collect dry seed pods at the end of summer
- Start seeds in seed trays filled with fine mix moistened with CompleteGrow 20-20-20
- Keep warm (18–22°C) and moist; germination takes 3–6 weeks
- Transplant to pots once seedlings have 2–3 true leaves


Fertilising Agapanthus: How to Boost Blooms and Support Healthy Foliage
While agapanthus are resilient, they bloom best when fed with a balanced, potassium-rich fertiliser. Avoid overloading with nitrogen, which encourages excessive leaf growth and fewer flowers.Recommended Fertilisers:
- NPK 20-20-20 – Great for initial planting and leaf growth in early spring
- NPK 4-18-38 + Cal-Mag – Ideal for mid-season flowering boost and strong root health
Fertiliser Timing:
- Spring: Begin with 20-20-20 every 2 weeks at 4 mL per litre
- Mid-Spring to Summer: Switch to 4-18-38 fortnightly to promote flowering
- Autumn: One final feeding before trimming back old stems
Trimming & General Maintenance:
- Cut spent flower stalks down to base after flowering to conserve plant energy
- Remove yellow or dead leaves to keep clumps tidy
- Divide large clumps every 3–5 years to prevent overcrowding and reinvigorate blooms
- Inspect regularly for snails and scale insects—treat early if noticed
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