Aphids in June: The Allies That Really Work — and 3 Myths
Sticky leaves, curled shoots, an army of tiny suckers: aphids boom in June. Here's which beneficial insects and companion plants actually help — and three popular tips you can skip.
As soon as it warms up, they gather by the hundreds on roses, beans and tender new shoots: aphids are among the most common garden visitors in June. The good news is you don’t need chemicals to keep them in check. With the right beneficial insects and a few well-chosen companion plants, an infestation usually balances itself out — as long as you don’t fall for the usual half-truths.
Why aphids boom right now
In early summer, aphids reproduce without mating: the females give birth to live young that can have offspring of their own within days. In warm, dry weather a colony can multiply several times over in a single week.
They love soft, fresh growth — exactly the juicy new shoots your plants push out in June. A few aphids are completely normal and no reason to panic. It’s only worth stepping in once shoot tips start curling and the leaves turn sticky and shiny.
The real cleanup crew in your beds
Before you reach for a spray bottle, it pays to notice the allies that are already there. Ladybirds are the famous ones, but the heavy lifting is done by their ravenous larvae: a single one can polish off several hundred aphids in two weeks.
Just as important are lacewing and hoverfly larvae. Hoverfly larvae look like tiny green maggots and quietly clear out entire colonies. Add to that minuscule parasitic wasps that lay their eggs inside the aphids — leaving behind those telltale swollen, golden-brown mummies. If you have these helpers in your beds, you usually do not need to intervene at all.
Companion plants that do the work for you
You can deliberately draw in the beneficials while distracting the aphids at the same time. Nasturtium is the classic choice: aphids practically flock to it and gather on its shoots instead of on your beans or cabbage. Planted as a trap crop along the edge of a bed, it sacrifices a few tendrils and keeps your main crop clean.
Summer savory next to beans has been considered a gentle aphid deterrent for generations — and it is a great culinary partner anyway. A border of calendula, dill, fennel or yarrow offers nectar to adult hoverflies and lacewings — and those are exactly the insects that go on to lay their aphid-eating larvae in your beds. In short: you are setting out a buffet for your helpers.
Myth 1: a squirt of dish soap will do
Probably the most common tip going around — and the one with the greatest potential to backfire. Dish soap is made to cut grease and contains fragrances and additives that can scorch sensitive leaves, especially in full sun.
Reach for plain potassium soft soap from the garden centre instead: one to two tablespoons per litre of water, with a dash of surgical spirit. The solution works purely on contact, dissolving the aphids’ waxy coating. Spray in the evening, including the undersides of the leaves, and repeat after three or four days so you catch the freshly hatched ones too.
Myth 2: buying ladybirds fixes everything
Bought ladybirds sound like the perfect instant remedy — but in practice the released beetles often simply fly off the moment they do not feel at home. And it is the larvae, not the adults, that do most of the eating anyway.
It is far more sustainable to make your garden attractive enough that beneficials settle and breed on their own: a few flowering plants, an unmown corner, a pile of leaves or brushwood as a winter shelter. It takes a little patience, but the effect lasts year after year — with nothing to reorder.
Myth 3: the ants are to blame
When people see ants on infested shoots, they are quick to blame them. It is actually the other way round: ants milk the aphids for their sweet honeydew — and even defend their livestock against ladybirds and hoverflies. So the aphids are not caused by the ants, but wherever ants rule, colonies can grow undisturbed.
Make it harder for the ants to reach the plant — with a sticky band around the stem, or by relocating nests away from the bed — and you give the beneficials a clear run again. In Rootivo, the companion-planting layer in the bed planner helps you place trap plants and flowering borders correctly, and the lexicon has a dedicated article on aphids with more biological remedies.
Im Lexikon: Kapuzinerkresse