Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
Yes, you can spray Roundup around blueberry bushes, but you have to be extremely careful because blueberry roots are shallow and sensitive.
Roundup, whose active ingredient is glyphosate, is a non-selective herbicide that kills most plants it touches.
That means if it drifts onto your blueberry leaves or soaks into the root zone, it can seriously harm or even kill your bushes.
So while spraying Roundup around blueberry bushes is possible, it’s not something you should do carelessly.
The key is understanding how Roundup works, where blueberry roots actually live, and how to apply it without turning your berry patch into a disaster zone.
In this post, we’ll walk through whether you can spray Roundup around blueberry bushes, the risks involved, and the safest ways to handle weeds near your plants.
Let’s dig in.
Can You Spray Roundup Around Blueberry Bushes Safely?
You can spray Roundup around blueberry bushes, but only if you take serious precautions.
The short answer is yes, it’s done by many growers, but the margin for error is small.
Here’s why.
1. Roundup Is Non-Selective and Kills on Contact
Roundup doesn’t care whether it lands on a weed or a blueberry bush.
If the spray touches blueberry leaves, it gets absorbed through the foliage and travels down to the roots.
That can cause yellowing, stunted growth, and in bad cases, the death of the bush.
So when you spray Roundup around blueberry bushes, every droplet needs to land exactly where you want it.
2. Blueberry Roots Are Shallow and Widespread
Blueberry bushes have fine, shallow roots that sit mostly in the top 12 to 18 inches of soil.
These roots spread far beyond the drip line of the bush.
That means spraying Roundup around blueberry bushes can easily hit feeder roots if the soil is bare and the chemical reaches down.
Glyphosate binds to soil particles fairly quickly, which limits root uptake, but it’s not a guarantee.
If you spray too close or too much, you’re gambling with your bush’s health.
3. Young Blueberry Bushes Are Most Vulnerable
Young blueberry bushes have less established root systems and thinner bark.
Spraying Roundup around young blueberry bushes is riskier than around mature ones.
A mature bush might shrug off a tiny mistake.
A young bush might not survive it.
So if your blueberries are less than two or three years old, you should think twice before spraying Roundup around blueberry bushes at all.
How to Spray Roundup Around Blueberry Bushes Without Killing Them
If you decide you still need to spray Roundup around blueberry bushes, you can reduce the risk by following a few smart habits.
1. Use a Shield or Cone to Direct the Spray
Never use a broad fan nozzle near your blueberries.
Instead, attach a cone or shield to your sprayer so the herbicide goes exactly where you aim it.
This keeps the mist from drifting onto blueberry leaves or canes.
It’s the single most important step when you spray Roundup around blueberry bushes.
2. Spray on a Calm Day With No Wind
Wind is the enemy of careful spraying.
Even a light breeze can carry Roundup droplets onto your blueberry foliage.
Pick a calm morning with no wind forecast for at least a few hours.
That way, what you spray around blueberry bushes stays on the weeds, not on your plants.
3. Keep the Spray Away From the Drip Line
The drip line is the outer edge of the bush’s canopy.
Roots extend well past that point.
As a rule, stay at least 12 to 18 inches away from the base when you spray Roundup around blueberry bushes.
Weeds right at the trunk are better pulled by hand.
4. Apply When Blueberries Are Dormant
Late winter or early spring before bud break is the safest window.
The bush is dormant, so it’s less actively taking up nutrients and chemicals.
Spraying Roundup around blueberry bushes during dormancy lowers the chance of injury.
Never spray when the bush is flowering or fruiting.
5. Don’t Spray Wet Soil or Saturated Roots
Glyphosate moves less in dry soil because it binds to clay and organic matter.
If the soil is soggy, the chemical can travel further than you expect.
So avoid spraying Roundup around blueberry bushes right after heavy rain or irrigation.
Safer Alternatives to Spraying Roundup Around Blueberry Bushes
If all this sounds like a lot of risk for a little weed control, you’re not wrong.
There are safer ways to deal with weeds near blueberries.
1. Hand Pulling and Mulching
A thick layer of pine bark, wood chips, or pine needles suppresses most weeds.
Blueberries love acidic, well-drained soil, and mulch keeps it that way.
Pull weeds by hand while they’re small and you’ll rarely need to spray Roundup around blueberry bushes.
2. Use a String Trimmer Carefully
A string trimmer can knock down weeds without chemicals.
Just keep the line away from the blueberry canes, because damaged bark invites disease.
3. Vinegar or Horticultural Vinegar
For small weeds, a spot spray of horticultural vinegar can work.
It’s non-selective too, so the same care applies.
But it breaks down fast and doesn’t linger in the soil like Roundup.
4. Flame Weeding Between Rows
A propane torch can scorch weeds between blueberry rows.
Keep the flame well away from the bush and never use it in dry, windy conditions.
So, Can You Spray Roundup Around Blueberry Bushes?
You can spray Roundup around blueberry bushes, but it comes with real risk to your plants.
Roundup is non-selective and blueberry roots are shallow, so a careless spray can injure or kill your bushes.
If you must spray Roundup around blueberry bushes, do it on a calm day, use a shielded nozzle, stay outside the drip line, and only spray during dormancy.
Even better, choose mulch, hand pulling, or other safer options first.
Your blueberries will thank you for the extra care, and you’ll still get a clean, healthy patch without gambling with herbicides.