What is the Best Fertilizer for Chrysanthemum?

Chrysanthemums are heavy feeders, and choosing the right fertiliser makes all the difference between weak, short-lived flowers and a stunning seasonal display. The best fertiliser for mums depends on their growth stage: a balanced fertiliser for leafy growth and a bloom-boosting formula for flower development. With the right nutrients at the right time, chrysanthemums reward you with abundant, vibrant, long-lasting blooms.

Balanced Fertiliser for Growth

In spring and early summer, chrysanthemums need a fertiliser that promotes healthy root systems and lush green foliage. The ideal choice is a complete balanced formula such as the
NPK 20-20-20 Plant Fertiliser. With equal parts nitrogen, phosphorus, and potassium, this fertiliser ensures steady growth, resilience, and stress tolerance. Apply every 3–4 weeks to keep plants strong and well-prepared for the upcoming flowering season.

Why Balance Matters

Too much nitrogen alone can cause mums to grow leafy but fail to flower, while insufficient potassium weakens stems and reduces flower quality. A balanced fertiliser like 20-20-20 provides everything the plant needs in equal proportions, preventing deficiencies and setting the stage for heavy blooms.

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Bloom Fertiliser for Flowering

When chrysanthemums start forming buds in late summer, their nutritional needs shift. They now require more phosphorus and potassium to support bud initiation, flower size, and colour vibrancy. The best fertiliser at this stage is the Advanced Formula NPK 4-18-38 + Calcium & Magnesium. This high-phosphorus, high-potassium blend enhances bloom density while calcium and magnesium strengthen petals and stems.

Feeding Frequency

During flowering, feed every 2–3 weeks for consistent results. Always apply fertiliser at the soil level and water in well. Potted chrysanthemums may need more frequent but lighter applications, as nutrients leach quickly from containers. Avoid overfeeding with nitrogen-heavy products, as these encourage foliage instead of flowers.

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Long-Term Feeding Strategy

The best approach is to use a two-phase fertilising strategy: start with a balanced feed in spring, then transition to a bloom fertiliser before buds form. This ensures your chrysanthemums have everything they need at the right time, producing healthier plants and more colourful flowers each year. Mulching, proper watering, and pruning also work hand-in-hand with fertiliser to maximise results.

FAQs – Best Fertiliser for Chrysanthemums

What is the best fertiliser for growth? NPK 20-20-20 is ideal for foliage and root development in spring and early summer.
What should I use for flowers? Switch to NPK 4-18-38 + CaMg when buds appear for vibrant, long-lasting blooms.
How often should I feed mums? Every 3–4 weeks in growth, every 2–3 weeks during flowering.
Do potted mums need different feeding? Yes, apply fertiliser more often at lower strength, as nutrients wash out faster in pots.
Can I just use one fertiliser all year? A balanced fertiliser works, but switching to a bloom booster at the right time gives the best results.