The Short Answer
Greenfly (aphids) on roses are best dealt with by squishing them between your fingers or blasting them off with a strong jet of water from a hose. Both methods are instant, free and do not harm the beneficial insects that eat aphids for you. For heavier infestations, spray with diluted washing-up liquid (5 ml per litre of water) on a dry day — it suffocates them on contact.
The harder truth: a few greenfly on your roses are completely normal and rarely cause serious damage to an established bush. Ladybirds, hoverflies and lacewings will find them within days. If you spray everything with insecticide, you kill the predators too — and the aphids bounce back faster because nothing is left to eat them.
What Are Greenfly and Why Do They Attack Roses?
Greenfly are a type of aphid — small, soft-bodied insects that feed by piercing plant tissue and sucking out the sugary sap. The most common species on UK roses is the rose aphid (Macrosiphum rosae), which is typically pale green but can also appear pink or reddish-brown.
They target roses specifically because rose bushes produce a flush of soft, nitrogen-rich new growth every spring — exactly what aphids need to reproduce. A single female aphid can produce up to 80 offspring in a week without even mating (a process called parthenogenesis), which is why an apparently empty rose bush can be covered in greenfly within days.
When do greenfly appear on roses in the UK?
Greenfly typically arrive from late April to June, coinciding with the first flush of new growth. Warm, dry spring weather accelerates their breeding. Numbers usually decline naturally from July as ladybird and hoverfly larvae populations build up and start feasting. A second, smaller wave can appear in September on late-season growth.
Check your frost date by postcode — the later your spring, the later greenfly usually appear.
Signs of greenfly on roses
- Visible clusters on new shoot tips, around flower buds and on the undersides of young leaves
- Curled or distorted leaves — young leaves roll inward as aphids drain sap
- Sticky residue (honeydew) on leaves and surfaces below the plant
- Black sooty mould growing on the honeydew — harmless but unsightly
- Ants climbing the stems — ants farm aphids for their honeydew and actively protect them from predators
How to Get Rid of Greenfly on Roses — 6 Natural Methods
These methods are listed in order of what I would try first. Start with the simplest and work your way down only if needed.
1. Squish Them by Hand
The simplest and most effective method for small infestations. Put on a pair of gardening gloves, pinch the shoot tip between finger and thumb, and gently rub the aphids off. They have no defence against this — they are soft-bodied and pop easily. Check your roses every morning in May and June and squish any clusters you find. Two minutes a day keeps the population under control before it explodes.
Effectiveness: High — instant, targeted, no collateral damage2. Blast with a Hose
Set your garden hose to a firm (not violent) jet and spray the affected shoots. This dislodges aphids from the plant — once knocked to the ground, most cannot climb back up. Do this early in the morning when the plant is turgid and can handle the pressure. Repeat every 2–3 days for a week. It works surprisingly well and costs nothing.
Effectiveness: High — clears 70-80% per application3. Washing-Up Liquid Spray
Mix 5 ml of washing-up liquid (roughly one teaspoon) into 1 litre of water in a spray bottle. Spray directly onto the aphids, making sure to coat the undersides of leaves where they hide. The soap blocks their breathing pores and they die within hours. Apply on a dry, overcast day or in the evening — strong sunshine on wet soapy leaves can cause leaf scorch.
Important: Rinse the rose with clean water the next morning to prevent soap residue building up. Do not increase the soap concentration — too much detergent damages the leaf surface.
Effectiveness: High — kills on contact, safe for roses at correct dilution4. Neem Oil Spray
Mix 5 ml of cold-pressed neem oil with 1 litre of warm water and a few drops of washing-up liquid (to emulsify the oil). Shake well and spray onto affected areas. Neem oil disrupts aphid feeding and reproduction without harming ladybirds, bees (once dry) or other beneficial insects. It also has mild fungicidal properties, helping prevent the blackspot that often accompanies aphid-weakened roses.
Apply in the evening to avoid leaf scorch. Reapply every 7–10 days. Neem oil is available from most UK garden centres for around £8–£12.
Effectiveness: High — kills and deters, plus fungicidal bonus5. Encourage Natural Predators
This is the long game, but it is the most effective strategy over a full growing season. A single ladybird eats up to 50 aphids per day. A single ladybird larva devours around 500 aphids before pupating. Hoverfly larvae, lacewing larvae and blue tits are also voracious aphid predators.
How to encourage them:
- Build or buy an insect hotel and place it near your roses
- Leave a pile of logs, stones or leaf litter in a sheltered corner for overwintering ladybirds
- Plant companion plants that attract hoverflies: fennel, dill, yarrow, marigolds and sweet alyssum
- Never spray broad-spectrum insecticides — they kill predators and the aphids return faster
- Tolerate a few aphids in spring — they are the food that attracts predators to your garden
6. Companion Planting Around Roses
Certain plants repel aphids or attract their predators. Interplanting these near your rose bushes creates a natural defence system.
| Companion Plant | How It Helps | Where to Plant |
|---|---|---|
| Lavender | Strong scent confuses aphids; attracts hoverflies and bees | At the base of roses or along borders |
| Chives | Allium scent deters aphids; also helps prevent blackspot | Underplant roses or edge beds |
| Marigolds (French) | Attract hoverflies, whose larvae eat aphids | Between rose bushes, in the front of beds |
| Fennel / Dill | Attract ladybirds and lacewings | Nearby in a herb patch or mixed border |
| Garlic | Strong scent deters aphids; companion planting tradition | Plant cloves around rose base in autumn |
| Sweet alyssum | Ground cover that attracts parasitic wasps (aphid predators) | Under and between roses as living mulch |
Use our compost calculator if you need to prepare beds for companion planting, or our mulch calculator to work out bark for suppressing weeds between plants.
Effectiveness: Medium — reduces infestations, does not eliminate entirelyWhat Not to Do
Products containing permethrin, deltamethrin or lambda-cyhalothrin kill aphids, yes — but they also kill ladybirds, lacewings, hoverflies and bees. Without these natural predators, aphid populations explode again within 2–3 weeks and you are worse off than before. This is called the “pesticide treadmill” and it is the single biggest mistake UK rose growers make.
Too much nitrogen fertiliser (like Growmore or liquid tomato feed at high concentrations) produces exactly the soft, sappy growth that aphids love. Feed roses with a balanced rose fertiliser in March and June, and resist the urge to give them extra. If you are unsure about quantities, use our fertiliser calculator to get the right rate.
Understanding the Greenfly Lifecycle
Knowing when and how aphids breed helps you time your interventions for maximum impact.
| Month | What Happens | What to Do |
|---|---|---|
| March | Overwintering eggs hatch on rose stems | Check stems for tiny black eggs; prune out badly infested wood |
| April – May | First generation appears on new growth; rapid reproduction begins | Daily squishing checks; start companion plants |
| June | Peak infestation; winged aphids migrate to spread | Water blasting + soap spray if heavy; encourage ladybird larvae |
| July – August | Natural predators build up; aphid numbers decline | Reduce intervention; let predators do the work |
| September | Smaller second wave on late growth; mating pairs produce overwintering eggs | Squish any clusters; prune out egg-laying stems in winter |
| October – February | Eggs dormant on rose stems | Winter wash with plant oil spray to smother eggs |
Best Natural Aphid Products UK 2026
When hand-squishing and water blasting are not enough, these organic and naturally derived products are safe for roses and wildlife.
Neem Oil (Cold Pressed, 250ml)
Mix with water and washing-up liquid. Kills aphids, deters re-infestation and helps prevent blackspot. One bottle makes around 50 litres of spray.
Buy on AmazonBug Clear Ultra Organic (1L Ready to Use)
Fatty acid-based spray. Kills aphids, whitefly and spider mites on contact. Approved for organic gardening. Safe for bees once dry.
Buy on AmazonInsect Hotel (Wooden, Freestanding)
Provides overwintering habitat for ladybirds, lacewings and solitary bees. Place near roses or on a south-facing wall. Biggest long-term aphid investment.
Buy on AmazonWinter Tree Wash (500ml Concentrate)
Plant oil-based spray for dormant rose stems (December – February). Smothers overwintering aphid eggs before they hatch in spring.
Buy on AmazonLinks above are affiliate links — we may earn a small commission at no extra cost to you.
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