How to Grow Chrysanthemums

Chrysanthemums, often called “mums,” are one of the most rewarding flowering plants for Australian gardens. Known for their brilliant autumn colour and wide range of varieties, they can be grown in borders, pots, or mass plantings. Getting chrysanthemums right from the start means paying close attention to location, soil, and early care. This first stage is where the foundation for strong stems and abundant flowers is built.

Location, Soil and Planting Basics

Chrysanthemums require at least six hours of direct sunlight each day to flower well. Choose a site with good air circulation to reduce fungal issues, and avoid low-lying areas prone to waterlogging. Soil should be well-drained and fertile, ideally a loam enriched with compost or organic matter. Before planting, loosen the ground to around 25–30 cm depth to encourage root penetration. Plant seedlings or cuttings in spring, spacing them 30–50 cm apart to allow airflow and reduce overcrowding. After planting, water deeply and mulch around the base to retain soil moisture.

Common Questions About Planting Chrysanthemums

When is the best time to plant chrysanthemums? In most parts of Australia, early spring is ideal, giving plants enough time to establish before their late-season flowering.
Can chrysanthemums be grown in pots? Yes — they adapt well to containers as long as you use a quality potting mix with added drainage material and water them consistently.
Do chrysanthemums need rich soil? They benefit from soil enriched with organic matter, but fertility should be balanced. Excess nitrogen can lead to leafy growth with fewer flowers.

For healthy establishment, apply a balanced fertiliser such as the
NPK 20-20-20 Plant Fertiliser. Its even ratio of nitrogen, phosphorus, and potassium strengthens root growth and ensures a vigorous, well-shaped plant ready for flowering.

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Feeding and Flowering Care

Once chrysanthemums are growing strongly, consistent feeding and care will determine their flower quality. Water regularly, focusing at the base of the plant to keep foliage dry and reduce fungal risk. Apply mulch to retain soil moisture and suppress weeds. Taller varieties should be staked early to prevent breakage in windy conditions. Pinching back the tips of new shoots in late spring encourages bushier plants, while deadheading spent blooms extends the flowering period into late autumn. Regular inspection for pests such as aphids and spider mites is also essential, as infestations can quickly reduce flower quality.

As buds begin forming, switch to a bloom-focused fertiliser such as the
Advanced Formula NPK 4-18-38 + Calcium & Magnesium. Its high phosphorus and potassium content drives bud development and flower colour, while calcium and magnesium improve stem strength and extend the life of blooms. This change in nutrition ensures your chrysanthemums reach their peak display.

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Seasonal Care, Overwintering and Propagation

At the end of flowering, cut stems back to 10–15 cm above the soil to help conserve plant energy. In frost-prone regions, mulch heavily or move pots into sheltered areas, while in warmer climates mums often re-sprout naturally the following spring. Every two to three years, divide older clumps in early spring to maintain plant vigour and prevent overcrowding. Propagation from cuttings is another simple method: take 7–10 cm shoots in spring and root them in a light propagation mix.

Good airflow, balanced feeding, and consistent watering practices will keep plants free from fungal issues like powdery mildew. With this seasonal approach, chrysanthemums can remain a highlight of the garden for many years, rewarding you with dense foliage and brilliant seasonal colour.