What to Feed Peonies in Spring

In spring, peonies benefit most from liquid fertilisers that deliver a balanced supply of nutrients. Start with an NPK 20-20-20 blend to power new shoots and foliage, then use a higher phosphorus and potassium formula such as NPK 4-18-38 + Calcium & Magnesium to strengthen roots, set buds, and improve flower quality.

Why Feeding in Spring Matters

Spring is the most important feeding period in a peony’s life cycle. As shoots break through the soil, the plant relies on both stored energy and new nutrients to fuel rapid growth. At the same time, invisible bud initiation begins for next season’s flowers. Feeding at this stage not only produces healthy stems and leaves now, but also determines how many flowers you’ll enjoy in the future.

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Best Fertilisers for Spring Peonies

Two fertilisers work especially well in spring when used as part of a cycle:

All Purpose NPK 20-20-20: A balanced formula that fuels shoot emergence, stem strength, and early foliage growth. Apply at 4ml per litre every 2–3 weeks in spring for steady results.
Advanced Formula NPK 4-18-38 + CaMg: Higher in phosphorus and potassium, with added calcium and magnesium. This advanced blend improves root development, ensures strong bud initiation, and enhances bloom size and colour intensity.

By starting with 20-20-20 and switching to 4-18-38 + CaMg as buds form, you give peonies the perfect nutritional progression for both growth and flowering.

How to Apply Fertiliser in Spring

Always water the soil lightly before applying fertiliser. Use diluted liquid feeds around the root zone, avoiding direct contact with foliage. For potted peonies, apply every 2–3 weeks. For garden beds, stick to the three main spring feeds: shoot emergence, bud swelling, and post-flowering recovery.

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Spring Feeding Tips for Stronger Peonies

Begin Early: Start feeding as soon as red shoots emerge in spring.
Shift Formulas: Use 20-20-20 for early growth, then move to 4-18-38 + CaMg as buds swell.
Support Growth: Combine feeding with deep watering and mulch to protect roots.
Avoid High-Nitrogen Fertilisers: Lawn fertilisers promote foliage but reduce flowering.

FAQs on Feeding Peonies in Spring

What is the best fertiliser for peonies in spring? A balanced liquid NPK 20-20-20 for early shoots, followed by NPK 4-18-38 + CaMg for root strength and bud setting.

How often should I fertilise? Potted peonies: every 2–3 weeks. Garden peonies: three main applications in spring.

Do I need both fertilisers? Using both gives the best results — 20-20-20 builds structure, while 4-18-38 + CaMg enhances flowering performance.

By combining CompleteGrow All Purpose NPK 20-20-20 with CompleteGrow Advanced Formula NPK 4-18-38 + CaMg, you provide peonies with the complete spring nutrition they need for strong stems, healthy roots, and stunning blooms.