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Heat Defense Granular 21-0-3 (12 lb)

One 12 lb bag covers up to 4,000 sq ft

LAWN PLAN EXCLUSIVE

Orange and green bag of Heat Defense Granular Fertilizer

Heat-season backup in one spread.

A 21-0-3 NPK granular fertilizer that improves water movement and moisture retention for steady greening and summer-season support, in one easy spread.

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LAWN PLAN EXCLUSIVE

Orange and green bag of Heat Defense Granular Fertilizer

Meet the granular built for hot, dry days

Exclusively available only in Sunday Lawn Plans

When temps rise and rain dips, this blend keeps your lawn on track. Premium ingredients support healthy growth and greener color, while the added surfactant helps water move into soil and reach roots more evenly, especially in arid regions. We also added leaf compost to support healthier soil. (Bet you didn’t know granular did that.)

One spread. One watering. Greener grass made simple. (We kept it humble. Your lawn won’t.)

The good stuff inside

  • Zero pesticide fertilizer —everything you need, nothing you don't
  • Universally loved by climates and grasses
  • Heat stress tolerance from potassium
  • Steady growth and green-up with nitrogen, calcium and sulfur
  • Builds organic matter from recycled leaf compost

How to use

Fill the spreader. Spread evenly for full coverage. Water in. Let dry. Go brag.

How soon will I see results with Heat Defense Granular?

With good moisture, you should notice a greener, thicker lawn in about 1 to 2 weeks.

Is Heat Defense Granular safe for all grasses?

Sure is. While designed with the arid West in mind, this product can be used on any lawn or grass type.

When should I apply Heat Defense Granular?

Late spring is prime time, right before summer heat. You can also use it ahead of a forecasted dry spell.

Will Heat Defense Granular let me water less?

No. It improves water movement and soil moisture behavior but does not reduce irrigation needs. To reduce watering needs, add Sunday’s Drought Defense into your normal routine. You can use it alongside any Sunday lawn fertilizer, liquid or dry.

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Granular Lawn Fertilizer Instructions

Your lawn is a living thing. Soil, roots, microbes, the whole crew. Sunday's granular fertilizers feed that system slowly, so your grass grows steadily (instead of spiking and stalling). Here's how to put them to work

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Customer reviews

Based on 10600 reviews!
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Michael S.
Verified Reviewer
LocationPA
Great. Magnificent

I was very skeptical of using this product. I am shocked and surprised how well Sunday did for my lawn. After many times of making my lawn look good. There are no words to express how well my lawn looks. This year

Published date
04/23/26
Was this review helpful?
1
0
Fredy
Verified Reviewer
LocationIndiana
Not happy with results.

Not happy with the results with the Weed & Green pre-emergent. New Weeds all over my lawn. Would not purchase again.

Published date
04/11/26
Was this review helpful?
11
1
Ryan
Verified Reviewer
LocationColorado
Full solution lawn care

I have been a Sunday user for a number of years and am thrilled at the transformation my lawn has made (before and after photos about a year into my Sunday subscription attached). The products ship straight to my door and the instructions and application dates are clear. Customer service and their v...

Comments by Store Owner on Review by Sunday on Sat Apr 11 2026
Sunday
Hello Ryan! We are delighted to hear about the amazing results you have achieved with Sunday products. We look forward to being your partner on this lawn care journey for many more years to come!
Published date
04/09/26
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0
0
Nicole
Verified Reviewer
LocationCO
We grew back grass in time for our wedding

We planned a post-wedding party for our backyard last year. Couldn't imagine we'd be able to grow grass in time. Sunday not only helped us grow back our lawn but our dog was sooo happy too. Cannot recommend the custom plan plus dog lawn grass seed and lawn aid enough.

Comments by Store Owner on Review by Sunday on Sat Apr 11 2026
Sunday
Hi Nicole! We are thrilled to hear that our custom plan and dog lawn grass seed worked wonders for your backyard party. We look forward to helping you with all your lawn needs in the future!
Published date
04/09/26
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0
0
Mike S.
Verified Reviewer
LocationCO
Impressive.

Very impressed so far! I used the weed and green pre emergent (***www.getsunday.***/shop/lawn-care/weed-green-pre-emergent-and-post-emergent-weed-killer-2-pack) was shocked to see how quickly it started working without all the harsh chemicals! My dog was back on the lawn within 24 hours. So far so g...

Published date
04/06/26
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1
0
John
Verified Reviewer
LocationColorado
Green grass without a lame new hobby

Came across Sunday on advice from a friend. I'd always wanted to be one of those people with lush green grass but wasn't looking for another hobby to take my time and money. Sunday fits the bill: just tell me what to do and when to do it. My lawn is now up there with the best on the street and I get...

Published date
03/25/26
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4
1
David L.
Verified Reviewer
LocationCO
Love how easy Sunday is

Wow—Sunday really made my lawn look so much better. Lawn is thick and very green. It’s super easy to use, and I’ve been really happy with the subscription.

Published date
03/25/26
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0
0
Larry
Verified Reviewer
LocationColorado
Three years in

Three years in and our lawn is beautiful. So much easier than everything I tired before. The tree fertilizer also did wonders for my cherry tree.

Published date
03/25/26
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0
0
Mike P.
Verified Reviewer
Thick Lawn grown in 85 % Sand !

We never could get grass to grow on our southwest front hill and our grass up front was always thin ! The back yard was always patchy and grass would never grow behind our pool ! We started using Sunday roughly 4 years ago and Wow ! nice thick lawn up front and a full lawn out back and in 85% sand t...

Published date
01/25/26
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8
1
Chris
Verified Reviewer
LocationVan Nuys, CA.
Great Results

I followed the recommended steps. After the first seeding, the ground was unreceptive so I added some topper cover/fertilizer. Aside from that, all the recommended steps have led to a beautiful lawn.

Published date
01/11/26
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1
2
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