If you’ve walked out to check your delphinium spikes or rose buds this week and found them coated in a sticky little cluster of green (or black, or gray) bugs, you’re not imagining things. Aphid populations really have exploded this year for a lot of gardeners, mine included.
The short answer: a mild winter let more aphids survive than usual, a wet, warm spring pushed out a ton of soft new growth for them to feast on, and their natural predators (ladybugs, lacewings, parasitic wasps) just haven’t caught up yet. It’s a timing problem more than anything else, and it’s very fixable once you understand what’s driving it.
I’ve been growing flowers long enough to know that “bad aphid years” tend to follow a pretty predictable pattern in the weather, and this year checked every box. Let’s get into why, which plants in your garden are most likely to be affected, and what actually works to bring things back into balance.
What Causes Aphid Outbreaks in the First Place?
Aphids are one of those pests that can go from “a few on one stem” to “an entire colony” in under a week, because females can reproduce without mating and give birth to live young that are already pregnant themselves. It sounds like something out of a horror movie, and honestly, in aphid terms, it kind of is. Under the right conditions, one aphid can turn into thousands in a matter of weeks.
The “right conditions” are exactly what most of us have had this year: extended mild stretches with no hard freezes to knock back overwintering eggs, followed by a burst of tender new growth on roses, perennials, and vegetable transplants. Aphids love new growth specifically. It’s soft, it’s full of sap, and it’s easy for them to pierce with their little mouthparts. So a rainy spring that has everything growing fast and lush is basically an all-you-can-eat buffet.
Why Does It Feel So Much Worse This Year Specifically?
A few factors tend to stack on top of each other in a bad aphid year, and most gardens dealing with heavy infestations right now have some combination of:
A mild winter that let more eggs and adults survive than usual
A wet spring that produced an unusual amount of soft, fast growth
A slow start for beneficial insects, since ladybugs and lacewings lag a few weeks behind aphid population booms every single year. They just haven’t caught up yet
Ants protecting the aphids from predators in exchange for the honeydew (the sticky substance aphids excrete), which can seriously delay natural control
I noticed this exact pattern in my own garden. My nasturtiums were covered before I saw a single ladybug. That gap between “aphids show up” and “predators show up” is where most of the damage happens.
Flowers Aphids Love Most
Aphids aren’t picky, but they do have favorites, and in my garden these are always ground zero:
Heliopsis or False Sunflower, is an aphid favorite (usually the bright orange oleander aphid) in my garden. Resist the urge to spray anything. A strong blast of water or hand-squishing is the only method I’ll use there, since this plant is a favorite with pollinators. Heliopsis seems to be able to handle the onslaught of aphids just fine.
Sweet Peas are another favorite. Aphids gather on the growing tips and flower buds just as the vines begin climbing. Check plants every few days during spring, and knock colonies off with a strong spray of water before they spread. Healthy sweet peas usually recover quickly if you catch infestations early.
Roses, especially newly flushed spring growth, are a classic aphid magnet. You’ll find them clustered right on the buds and the tender tips of new canes. Prune out heavily infested tips rather than spraying the whole plant, and do your major structural pruning in late winter while dormant, which reduces the amount of soft new growth available all at once come spring.
Milkweed attracts bright orange oleander aphids by midsummer. While the sheer number of insects can look alarming, I usually leave small populations alone because ladybugs, lacewings, and parasitic wasps quickly find them. If colonies become overwhelming, I simply blast them off with the hose rather than reaching for insecticides.
If deer or rabbit pressure is also part of your garden headaches on top of aphids, my deer-resistant flowers guide and rabbit-resistant flowers guide round out the picture. A lot of the toughest, most resistant plants in those lists also happen to bounce back from aphid damage the fastest, which isn’t a coincidence.
Are Aphids Actually Harmful, or Just Ugly?
Both, depending on severity. Light aphid populations are mostly cosmetic: a little curling on new leaves, some sticky honeydew, maybe sooty mold growing on that honeydew if it sits too long. That’s annoying but rarely fatal. Heavy, sustained infestations are a different story: they can stunt new growth, distort buds so flowers never open properly, and weaken the plant’s ability to push out healthy foliage. Young transplants and stressed plants are the most vulnerable to real damage.
How Do I Get Rid of Aphids Without Hurting Pollinators?
This is the question I get asked most, and my honest answer after years of dealing with this: start with the least aggressive option and only escalate if you need to.
A strong jet of water from the hose, aimed at the undersides of leaves, knocks most aphids off and they largely don’t make it back onto the plant. I do this every couple of days on badly hit plants.
Insecticidal soap is my next step for anything the water spray doesn’t fully handle. It only affects soft-bodied insects on contact, so it’s far gentler on bees and ladybugs than broad-spectrum sprays. I recommend Bonide Captain Jack’s Insecticidal Super Soap.
Encourage ladybugs and lacewings by leaving some flowering herbs like dill and fennel nearby; once they show up, they’ll clean up an aphid colony faster than anything you can buy in a bottle. If you want lots of ladybugs fast, you can actually buy live ladybugs here!
Avoid broad-spectrum insecticides entirely if you can. They kill the predators that would otherwise handle this for you long-term, which tends to make the next outbreak worse, not better.
Will Aphids Come Back After I Treat Them?
Probably, at least a little. Aphids are persistent, and as long as your garden has soft new growth, some will find their way back. The goal isn’t zero aphids forever; it’s keeping the population low enough that your plants and the beneficial insects can stay ahead of them. Once ladybug and lacewing populations catch up (usually a few weeks behind the initial outbreak), most gardens see a natural correction without much more intervention needed.
Why Are There So Many Winged Aphids?
If you’ve suddenly noticed aphids flying around your garden, don’t panic. Winged aphids develop whenever colonies become overcrowded or food starts running out. Their job is to find fresh plants, which is why infestations can seem to spread overnight.
Final Thoughts
Why are aphids so bad this year? It comes down to a perfect combination of weather and timing. A mild winter, a warm, wet spring, and a delay in beneficial insects allowed aphid populations to build much faster than usual. While the damage can look alarming, most gardens recover quickly once predators like ladybugs and lacewings catch up.
Keep an eye on new growth, knock aphids off with a strong spray of water when you spot them, and avoid reaching for harsh insecticides unless they’re truly needed. A little patience, combined with early action, is often all it takes to bring your garden back into balance.
FAQ – Why Are Aphids So Bad This Year
Do ladybugs actually eat that many aphids?
Yes, a single ladybug can eat dozens of aphids a day, and their larvae (which look nothing like the adults, more like tiny alligators) are even more voracious.
Why do aphids suddenly appear overnight?
Aphids reproduce at an astonishing rate, which is why an infestation can seem to appear overnight. If you’ve ever wondered how just a handful of insects can become hundreds in only a few days, I explain the process in my guide to why aphids appear overnight and how to stop them.
Can healthy plants survive aphids?
Yes. Healthy, established plants usually recover with little lasting damage once aphid numbers are reduced and beneficial insects arrive.
Will heavy rain wash aphids away?
Rain can knock some aphids from plants, but it rarely eliminates an infestation. A strong spray from your garden hose is much more effective because you can target the undersides of leaves where aphids gather.
Are aphids attracted to certain flower colors?
Aphids are drawn more to the tenderness of new growth and the smell of certain plants than to bloom color specifically, though yellow does seem to attract higher numbers of winged aphids overall.
Can aphids spread disease between my plants?
Yes, aphids are one of the most common vectors for plant viruses, since their piercing mouthparts can transfer infected sap from one plant to the next as they feed.
