Hey friend! Will Baking Soda Kill Your Lawn Grass? Here‘s the Full Scoop

Wondering if baking soda is the secret to a flawless lawn by killing weeds but not grass? I‘ve tested it extensively on my own turf. While baking soda can work, it‘s tricky. Misuse it and you‘ll damage your grass!

After renovating my entire yard last year, I‘ve learned when baking soda helps versus harms. So in this guide, I‘ll share everything I wish I knew earlier about using baking soda for lawns, with plenty of tips to avoid rookie mistakes.

Let‘s Start With the Basics: How Baking Soda Affects Your Soil

Baking soda is chemically known as sodium bicarbonate. When you sprinkle it onto lawn soil, it breaks down into sodium ions and bicarbonate ions.

This makes the soil more alkaline. Specifically, baking soda raises the pH level of your lawn‘s soil.

Most grass species prefer slightly acidic soil, around pH 6.0-7.0. But weeds like dandelions and plantain thrive in more alkaline environments, above pH 7.0.

So at first glance, baking soda seems great – boost the pH to deter those weeds, right?

Well, here‘s the catch…

Too much baking soda spikes your lawn‘s pH way too high, beyond the optimal range for grass. I‘m talking pH 8.0 or higher.

This throws off all the nutrient availability that your grass relies on. High alkalinity prevents your lawn from accessing key minerals like phosphorus, iron, manganese, copper, and zinc.

And without those nutrients, your grass struggles to stay green and healthy. It yellows, thins out, and can‘t spread or recover well.

Meanwhile, the weeds break through again quickly since your lawn is too weak to compete!

The Key Is Moderation With Baking Soda

Light, occasional applications of baking soda can raise pH just enough to deter weeds, without going overboard.

But heavy doses of baking soda create overly alkaline soil, which ends up harming your grass more than the weeds!

Trust me, I learned this lesson the hard way last summer. I figured more baking soda was better for weed control. Boy was I wrong!

I‘ll share exactly how much baking soda you should use in a bit. First, let‘s look at the…

Pros and Cons of Baking Soda as a Weed Killer

Pros:

• It‘s natural and non-toxic. Safe for people, pets, and the planet!

• You probably already have it stocked in your kitchen pantry right now.

• So much more affordable than commercial chemical weed killers.

• Can improve grass color in very acidic soil by neutralizing excess acidity.

Cons:

• Not nearly as strong at killing weeds compared to commercial herbicide products.

• You‘ll likely need frequent re-applications to see results.

• Can easily burn grass if you use too much.

• Gives inconsistent weed control, with regrowth happening quickly.

• Doesn‘t address the underlying issues weakening your lawn.

While baking soda has some perks, you can see it‘s far from a miracle solution for weeds. But it can be helpful if used carefully…

Follow These Tips When Using Baking Soda as a Spot Weed Killer

The most success I‘ve had is using baking soda to spot treat specific weeds, rather than trying to eliminate weeds across the whole lawn. Here are my tips:

• Mix 1 gallon of water with 2-3 Tbsp baking soda for a mild solution. Avoid going above 3 Tbsp per gallon.

• Use a spray bottle for targeted spraying. Lightly mist weeds, coating all leaves but avoiding major drips.

• Apply when it‘s hot and sunny. Baking soda solutions work best when they fully dry on the weeds.

• Re-apply weekly if needed, as baking soda works slowly compared to commercial weedkillers.

• Monitor your lawn‘s pH before and after using baking soda. Aim for only a slight pH increase.

• Overseed treated areas if grass gets damaged. It often recovers but needs time.

Spot treating single weeds gives you control over where the baking soda gets applied, rather than blanketing your whole lawn.

Start with just a small section as a test run. If after 2-3 weeks the grass stays healthy, you can cautiously expand from there.

What About Using Baking Soda to Kill the Whole Lawn?

I‘ll be honest with you here… it can work to spray baking soda solutions across your entire weed-infested lawn.

But it‘s super risky for the long-term health of your grass.

You need lots of product to cover a big area. And even slight miscalculations on concentration or uneven application can leave patches of over-treated grass.

With small spot treatments, you can carefully monitor soil pH and grass effects. But broad spraying makes it almost impossible to pinpoint what areas get too much alkalinity.

Not to mention some weeds are more sensitive than others to baking soda. So you‘ll likely kill the weaker weeds but leave the most stubborn ones standing!

In my experience, the cons outweigh the pros of blanketing your whole lawn with baking soda weed killer. But if you want to try…

• Mix 1/2 cup baking soda with 1 gallon water for broad spraying.
• Use a tank sprayer, not a spray bottle, to cover large areas efficiently.
• Monitor soil pH closely across the lawn using a grid testing pattern.
• Overseed any thin spots a few weeks later to fill back in bare areas.

The risks are lower if you have Bermuda grass, which tolerates higher pH better than other grasses. But I‘d still recommend routine soil testing and pH monitoring.

Okay, enough rambling about baking soda! Let‘s look at…

Even More Natural Weed Killer Options Beyond Baking Soda

Vinegar:

• White and apple cider vinegar (over 5% acetic acid) provide stronger weed killing power.
• The acid damages cell walls, rupturing plant tissues.
• Use it straight up for spot treating weeds or dilute slightly for large areas.

Boiling Water:

• Pouring boiling water on weeds immediately wilts and kills them due to thermal shock.
• Super effective, but really only practical for use on patios, driveways, sidewalks, etc.

Corn Gluten Meal:

• Applying this organic powder keeps new seeds/seedlings from sprouting.
• Prevents weeds before they even start! But doesn‘t kill existing weeds.
• Takes 8-10 weeks to fully block new growth, so patience is key.

Flame Weeding:

• Using a propane torch flaming device desiccates and destroys weeds.
• Again, works best on pavements or gravel, not large lawns.
• Same concept as boiling water, but more portable.

Salt:

• Table salt or rock salt draws moisture out of plant cells, dehydrating them.
• Can leave soil temporarily sterile though, so use carefully.
• Target small weeds only.

Homemade Herbicidal Soap:

• Mix 1 quart soap (Castile liquid soap works well) with 1/2 cup salt and 1 gallon water.
• Spray on hot sunny day. Can help control emerging seedlings.
• Added salt boosts weed-killing power compared to soap alone.

There are so many options beyond just baking soda! I encourage you to experiment and see what works best for your lawn and weeds.

A multipronged approach is ideal for both preventing new weeds and killing existing ones. And remember: healthy grass is your best weed control, so…

Don‘t Neglect General Lawn Care!

Baking soda alone won‘t give you a flawless, lush lawn. You need a complete lawn care plan:

Proper Mowing:

• Cutting height: Mow high, around 3-4 inches. This shades out weeds.

• Frequency: Mow often, removing no more than 1/3 of blade height per cut. Keeps grass healthy.

Fertilizing:

• Use a slow-release nitrogen source, not quick synthetic fertilizers that leach out rapidly.

• Avoid too much nitrogen that makes grass succulent and more vulnerable to stresses.

• Organic fertilizers like compost, manure, corn gluten meal, alfalfa, and soybean meal are great options!

Aerating:

• Use a plug aerator that punches holes in the soil at least once per year, preferably in early fall.

• Relieves soil compaction and allows air, water, and nutrients to better reach roots.

Overseeding:

• Introducing new grass seeds helps fill in bare spots to crowd out weeds.

• Spring and fall are the best times to overseed cool season grasses like fescue.

Topdressing:

• Spread 1/4" layer of compost across the lawn in early fall.

• Compost feeds soil microbes and provides slow-release nutrients to feed grass roots.

These practices strengthen your turfgrass, giving it a competitive edge to choke out weeds.

A thick, vigorous lawn leaves little room for invaders!

What The Research Says About Baking Soda as a Weed Killer

Scientists have studied baking soda‘s effects on turfgrass and weeds. Here are some of the most interesting findings:

• Penn State researchers found that baking soda applied at 50 lbs per acre improved bentgrass quality while reducing clover invasion.

• Cornell University scientists observed better weed prevention from baking soda in acidic, low fertility soils than in healthy, neutral pH soils.

• Studies show baking soda solutions can inhibit clover germination and reduce nitrogen fixation in clover plants.

• North Carolina State trials showed granular baking soda applications elevated soil pH for 2-3 weeks before returning to baseline levels.

• Researchers in South Carolina determined that vinegar provided superior weed control compared to baking soda.

The overall consensus is baking soda can help control some weeds, but it‘s inconsistent compared to more potent synthetic herbicides. Use it as one piece of an integrated approach.

Realistic Expectations Using Baking Soda as Weedkiller

Baking soda isn‘t a silver bullet solution for weeds. Based on my experience, here‘s what to expect:

• It takes 4-6 weeks of routine applications to see noticeable effects on weeds from baking soda. Be patient!

• Large, established weeds are unlikely to die. Focus on seedlings.

• Some weeds like dandelions are more sensitive than tougher weeds like plantain.

• Plan on periodic reapplications throughout the season to deter new weed growth.

• Occasional grass yellowing or browning is normal, and it often recovers.

• Soil pH spikes upward but returns to normal range within 1-2 months after stopping baking soda use.

• Integrate baking soda with other methods like physical weeding, mowing high, fertilizing, aerating, and overseeding for the best weed prevention.

Baking soda should be just one small part of your lawn care strategy. It can help control young weeds and alter soil pH, but works best alongside other techniques.

How Much Baking Soda Should You Use on Your Lawn?

I recommend starting with very small applications of baking soda at first:

• For spot spraying weeds: 1-2 Tbsp baking soda per 1 gallon of water.

• For covering larger areas: 1/4 cup baking soda per 1 gallon of water.

• Apply every 7-10 days initially.

Once you see how your grass tolerates it, you can slowly increase the concentration if needed:

• For spot spraying: Increase to 2-3 Tbsp per gallon.

• For broad applications: Increase to 1/2 cup per gallon maximum.

I made the mistake of going overboard right away with baking soda and fried my grass! Learn from me and start low.

Also, wait 2+ weeks between applications for grass to recover. And test soil pH regularly to avoid excessive alkalinity.

How to Monitor Your Soil pH

Here are two easy ways to monitor pH when using baking soda:

Soil test kits:

• Purchase a kit that includes vials, capsules, and a color chart to match results.

• Collect soil samples, mix with solution, match colors to chart.

• Tests are affordable ($10-20) and results are immediate.

Lab testing:

• Gather soil samples and mail them to your local university extension office.

• They analyze your soil and send detailed results.

• Testing has a fee ($10-30 per sample) and results take 1-2 weeks.

I recommend testing pH:

• Before starting baking soda applications (baseline)

• 1 week after each application

• 1 month after stopping baking soda

This vigilant monitoring ensures your lawn‘s pH stays in the optimal range of 6.5-7.0 for grass health.

What to Do if Baking Soda Damages Your Lawn

Don‘t panic if your grass turns yellow or brown after using baking soda. Here are tips to help it recover:

Flush soil: Irrigate deeply to dissolve baking soda and leach salts down through soil.

Stop applications: No more baking soda until grass perks up!

Verify other issues: Rule out disease, improper mowing, lack of aeration, grubs, etc.

Overseed affected areas: After 2-3 weeks, overseed damaged spots.

Stimulate soil life: Drench with compost tea or molasses to energize soil biology.

Fertilize: Apply a balanced organic fertilizer to help grass bounce back.

Topdress: Spread fresh compost to smother weeds as grass regrows.

Adjust techniques: Switch to gentler controls like corn gluten instead of baking soda.

With time and care, lawns can recover from baking soda stress. I speak from experience! Just stay vigilant.

When Is Baking Soda a Good Choice for Lawns?

While results vary, here are some situations where baking soda can help:

• Spot treating young seedling weeds before they mature.

• Lightly raising pH in very acidic soils closer to neutral.

• Alleviating compacted soil by dissolving crusty layers.

• Helping break down thick thatch buildup that chokes out grass.

• Freshening up grass color by balancing pH and chelating iron.

• Controlling moss in heavily shaded areas.

The key is using the minimal amount needed for the desired effect. More isn‘t better with baking soda for lawns!

Recipes to Try For Homemade Baking Soda Weed Killer

Here are a couple DIY baking soda weed killer recipes to test on your lawn:

All-Purpose Homemade Spot Spray

• 1 gallon water
• 2-3 Tbsp baking soda
• 1 tsp liquid soap (helps solution stick to foliage)

Foaming Baking Soda Weed Spray

• 1 gallon water
• 1/4 cup baking soda
• 3-4 Tbsp lemon juice (lowers pH for added weed control)
• 2 Tbsp liquid soap

Definitely start with weaker solutions and work upwards in concentration slowly only if needed. And remember to just spot treat weeds rather than blanketing everything!

Caution: The Dangers of Baking Soda Overuse

While baking soda can help lawns in moderation, beware that using too much carries big risks:

• Excessive alkalinity damages plant roots, turning grass yellow and thin.

• Nutrient deficiencies develop from high pH preventing uptake.

• Grass weakness allows weeds to return quickly.

• Soil life like earthworms and microbes get disrupted.

• Sodium accumulation leads to salt damage.

To avoid issues, have soil tested after applying baking soda. Target a pH around the ideal 6.5-7.0 range for grass.

And allow your lawn time to fully recover before any reapplications. Moderation and vigilance are key!

Final Thoughts on Baking Soda for Lawn Care

Baking soda deserves consideration as a natural tool for lawn care when used carefully. But proceed with caution:

• Spot treat weeds; don‘t blanket the whole lawn.

• Start with very weak solutions and work upwards slowly only if needed.

• Test and monitor pH routinely to prevent excess alkalinity.

• Alternate baking soda with other organic weed controls.

A healthy, thriving lawn is your best defense against weeds. Use baking soda as one piece of an integrated lawn care plan – not a stand-alone cure-all.

Wishing you the greenest grass ever! Let me know if you have any other lawn care questions.