When to Plant Ranunculus Bulbs – Seasonal Guide

Timing is everything when it comes to ranunculus. The best time to plant ranunculus bulbs is in late autumn to early winter, when soil temperatures are cool but not frosty. This allows the corms to establish strong roots before producing their spectacular blooms in spring. In Australia, planting is best done from March to May in most regions, or slightly later in warmer climates. Getting the timing right ensures a long flowering season and stronger, healthier plants.

When to Plant Ranunculus Globally

Ranunculus originate from the Mediterranean, where winters are cool and moist and springs are mild. To mimic these conditions, bulbs should be planted while the soil is cool, giving roots time to develop before hot weather arrives. The general guideline is:

Northern Hemisphere: Plant ranunculus bulbs in autumn (September–November), 2–3 months before the last frost.
Southern Hemisphere: Plant in late autumn to early winter (March–May) to allow flowering in late winter and spring.
Tropical regions: Grow in the coolest months of the year, avoiding hot and humid periods.

Wherever you live, the rule of thumb is to plant ranunculus once daytime temperatures average between 10–20°C and there’s no risk of heavy frost on newly planted bulbs.

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When to Plant Ranunculus in Australia

In Australia, the timing for planting ranunculus depends on your climate zone. Planting at the right time ensures bulbs avoid summer heat and have enough cool weather to thrive. Here’s a regional breakdown:

Southern states (VIC, SA, TAS, southern NSW): Plant from March to May, when the soil cools but before winter sets in.
Western Australia: Plant in April–May for strong autumn root development and spring flowers.
Queensland & Northern NSW: Plant slightly later, from April to June, as winters are milder and summers arrive sooner.
Cool alpine regions: Wait until frosts ease, then plant in mid to late autumn.

After planting, water lightly until shoots appear, then increase watering as plants grow. To encourage healthy foliage and abundant blooms, feed regularly. Start with CompleteGrow NPK 20-20-20 to establish strong roots and leaves, then switch to NEW Advanced Formula NPK 4-18-38 + Calcium & Magnesium as buds develop to boost flowering performance and colour.

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Ranunculus Planting FAQs

When is the best time to plant ranunculus bulbs?
Late autumn to early winter, when soil temperatures are cool. In Australia, this is generally March–May.

Can I plant ranunculus in spring?
Spring planting is possible in cool climates, but results are weaker. For best blooms, plant in autumn so corms can establish roots before flowering.

How long after planting do ranunculus bloom?
Typically 90–120 days after planting, depending on temperature and care. Earlier planting often gives a longer flowering season.

What fertiliser should I use for ranunculus?
Begin with a balanced fertiliser like NPK 20-20-20 for foliage and root growth. As plants enter flowering, switch to NPK 4-18-38 + Calcium & Magnesium for stronger blooms and improved colour.

Can I grow ranunculus in pots in Australia?
Yes. Use a deep container with drainage, plant in autumn, and follow the same feeding schedule as garden-grown bulbs. Pots often flower earlier due to warmer soil.

Planting ranunculus at the right time ensures strong roots, healthy foliage, and abundant flowers. Whether in garden beds or pots, starting with balanced feeding and switching to a bloom-boosting fertiliser ensures the most spectacular spring display.