How much fertiliser per rose per year? Complete feeding schedule

TL;DR - How much fertiliser per rose per year?

A mature rose bush needs approximately 100-150 grams of fertiliser per plant annually, split into three or four applications:

• March (growth start): 30-40 grams
• May (flower initiation): 25-30 grams
• July (summer bloom): 30-40 grams
• August (regrowth): 20-25 grams

This applies to cultured roses in-ground. Wild roses get less. Potted roses get more (due to limited soil).

Rule of thumb: One handful of organic fertiliser granules per rose in spring. Then liquid feed every three weeks.

Why roses need so much nutrition

Roses are the most nutrient-hungry bloomers. A rose you are happy with 1-2 flowers per month must first build energy. All those flowers cost lots of nitrogen, phosphorus, and potassium. Every flower you cut takes nutrition with it.

Additionally: roses sit for years in the same spot. They cannot build new root systems, so you must continuously replenish nutrition. An underfed rose blooms little, catches disease easily, and cannot withstand winter frost well.

A well-fed rose, by contrast, gives many flowers (until October), has strong stems, resistance to powdery mildew and rose rosette, and emerges strong from winter.

Fertiliser needs by rose type

Not all roses have the same feeding requirements.

Low (60-80 g/year) : Wild roses and shrub roses

• Rosa rugosa, Rosa canina, English type shrubs
• Fewer flowers, natural growth
• Light fertiliser once per season enough

Normal (100-130 g/year) : Cultured roses, border roses

• Hybrid tea, floribunda, modern shrub roses
• Many flowers, healthy growth
• Standard schedule (3-4 applications per season)

High (150-200 g/year) : Intensive flowering roses

• Cut roses in full sun, standard roses, very productive varieties
• Continuous flowers desired
• Frequent feeding (weekly liquid feed)

Potted roses (80-120 g/year depending on pot size)

• Miniature rose in 3-5L pot
• More nutrition per litre soil needed (less soil=less reserve)
• Two-week feed rule

Fertilising schedule per season: full year

March (preparation and start)

Goal: trigger strong new growth, activate roots.

• Give 30-40 grams granular fertiliser per rose
• Gently work in around stem (not touching stem itself)
• Water thoroughly (so fertiliser soaks in)
• Effect: noticeable in 4 weeks (new leaves, growth)

April (growth)

• No extra fertiliser needed (March feed still working)
• Check growth: good growth speed?
• Water regularly, soil must not dry
• No extra feeding this month

May (flower initiation)

Goal: trigger much flower formation, strong stems.

• Give 25-30 grams liquid feed or fertiliser solution
• Dilute in water, apply around plant base
• Repeat in 2 weeks (mid-May)
• Flowers appear now, harvest carefully

June (first bloom)

• Rose blooms heavily
• Give weekly liquid fertiliser (5-10 mL per litre, around plant)
• Or once granular fertiliser (20 grams)
• Remove spent flowers (deadheading), stimulates more
• Water regularly (rose blooms a lot, much evaporation)

July (peak and feeding)

Goal: build energy buffer, minimise heat stress.

• Give 30-40 grams granular fertiliser (less burn risk in heat than liquid)
• Or weekly liquid feed (totalled 40-50 grams equivalent)
• Extra water (heat stress = drought = fewer flowers)
• Check for powdery mildew, spider mite (heat helps diseases)
• Continue deadheading

August (regrowth prep)

Goal: nutrition for new growth after summer slump.

• Give 20-25 grams feed (half dose)
• Less nutrition (rose shifts from growth to consolidation)
• August is non-bloom month (normally), so less flower energy
• Water regularly (much happens in roots)
• Keep watch on diseases (septoria, black spot)

September (regrowth and late bloom)

• New growth visible (energy from June now returns)
• Flowers appear again
• No extra fertiliser now (March+July feeds still active)
• Water regularly, moderate deadheading

October-November (decline and winter prep)

Goal: no more flowers, shift nutrition to roots.

• Stop fertiliser after September (not needed)
• Reduce watering (plant preparing winter rest)
• No more deadheading (let seedheads form, plant calms)
• Late bloomers may get one liquid feed (half dose)

December-February (rest)

• No fertiliser, no water (except rain)
• Plant dormant
• Pruning in January (do not fertilise, wrong time)
• Winter ends: March begins again

Fertiliser types for roses

Granular fertiliser / rose-specific pellets (spring)

Examples: Pokon rose feed, Substral roses, organic garden fertiliser.

• Composition: high NPK, extra magnesium (rose preference)
• Action: 6-8 weeks slow release
• Advantage: single application, no burn
• Disadvantage: slower visible effect
• Dose per rose: 30-40 grams (one handful)

Liquid fertiliser / liquid rose feed (May-October)

Examples: Pokon blooming feed, Greencare rose liquid, organic flowering drink.

• Composition: quickly available, extra potash (bloom stimulation)
• Action: direct, visible within 1-2 weeks
• Advantage: quick, doseable
• Disadvantage: repeat needed (every 2 weeks)
• Dose per rose: dilute per label (usually 5-10 mL/litre water)

Organic fertiliser / compost (annual basis)

Examples: compost, horse manure, mushroom compost.

• Composition: slow, lots of soil microbe food
• Action: very slow (weeks), but durable
• Advantage: nutrition plus soil improvement, safe
• Disadvantage: less precise dosing
• Dose per rose: 1-2 cm layer around plant in autumn

Chicken manure / bird droppings (careful!)

Examples: Biovin, dry chicken manure pellets.

• Composition: very strong nitrogen, quick action
• Advantage: very cheap, quick effect
• Disadvantage: burn risk, smelly, overdose = weak plant
• CAREFUL DOSING: max 5-10 grams per rose per time
• Never apply without water!

Signs: enough nutrition or not?

Good nutrition (rose blooms well) :

• Bright green leaves, abundance of flowers (several per week)
• Stems firm, no drooping
• Flowers have full colour (not faded)
• Plant looks healthy (no weakness)

Too little nutrition :

• Yellow-green leaves, few flowers
• Stems weak, thin
• Flowers small, pale colour
• Disease risk greater

Too much nutrition :

• Very much foliage, few flowers
• Stems long but lax (poor closing)
• Disease risk (powdery mildew) greater
• Plant feels "overdone"

Perfect: much bright green foliage PLUS many flowers PLUS strong stems. Not foliage-starved, not foliage-overgrown.

Special situations

Standard rose (high nutrition)

Standard roses need more nutrition because stems use a lot of energy.

• Annual nutrition: 150-200 grams
• Extra applications: early May and early August
• Check for powdery mildew (stems more susceptible)

Climbing and rambler roses

Grow much more foliage, so need more nutrition.

• Annual nutrition: 120-150 grams
• More frequent watering
• Fewer flowers per plant, but many plants=many flowers total

English roses (David Austin)

Very productive bloomers, need much nutrition.

• Annual nutrition: 130-160 grams
• Extra application in May and August important
• Deadheading essential (much regrowth)
• Much water in summer

Potted rose / miniature rose

Limited soil volume = more efficient nutrition needed.

• Annual nutrition: 80-100 grams PER POT (not per rose)
• Water more frequently (soil dries fast)
• Every two weeks liquid feed better than large doses

Step-by-step

Step 1: Count roses and determine total nutrition

Number of roses x 120 grams = total annual nutrition needed. Example: 5 roses = 600 grams per year needed.

Step 2: Split into four applications

• March: 40% (240 grams for 5 roses)
• May: 20% (120 grams)
• July: 30% (180 grams)
• August: 10% (60 grams)

Step 3: March - granular fertiliser

Give granular, work in, water thoroughly.

Step 4: May - begin liquid feed

Weekly liquid feed (2 weeks long).

Step 5: June-July - maintenance

Weekly liquid feed, or once granular in July.

Step 6: August - scale back

Half-dose feed, prepare autumn.

Frequently asked questions

Can I give everything in March or all in May?

No. March feeding for growth, May for flowers, July for summer energy, August for consolidation. Each time has different purpose. Spread better than all at once.

Roses in pots: same feed as in-ground?

No, more. Pot soil has less reserve. Give 20-30% more nutrition, water more often. Monthly feed better than three times per year.

Can I give November feed to make rose stronger for winter?

No. November is rest period, rose prepares for winter. Feeding works against this. Stop late October. Winter feed = drag in spring.

Apply fertiliser in dry weather: risk?

Yes, burn. Granular in dry weather = chemical burn (brown leaf edges). Always water after fertiliser. Ideal: feed after rain.

Organic or synthetic: best for roses?

Both good. Organic: safer, slower, soil nutrition. Synthetic: quicker, precise, efficient. For hobbyists: organic (fewer mistakes). For cut roses: synthetic (manageable).

Roses have powdery mildew, does more feed help?

No. Powdery mildew = fungal disease, feed does not help. Helps instead: rose spray (sulphur), good air circulation, less leaf wetness. More feed = more lush foliage = more mildew risk.

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