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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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Customer reviews

Based on 10601 reviews!
Reviews with media
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Melia
Verified Reviewer
LocationSandy, UT
Thank you!!

Thank you for a clean product that works!!! I feel so much better spraying this in our yard instead of spreading toxins. . . dogs, cats, birds and squirrels all say thank you too! Our grass looks great too - I asked my husband what he thought and he just replied, 'have you looked at the grass? - it ...

Published date
12/29/25
Was this review helpful?
3
1
Scott
Verified Reviewer
LocationHuntersville, NC
Amazing!

Sunday and all of the plans and services that are offered cannot be beat. You have a question, they have an answer. You’re not sure about something, just ask and Sunday is there. Thank you for having a wonderful yard to be so simple.

Published date
11/07/25
Was this review helpful?
6
1
Kevin
Verified Reviewer
LocationBrandon, MS
Wonderful Lawncare

I started using Sunday this year and I love it so far! Great products that aren't full of harmful chemicals and they work! My lawn loves the fertilizer and doesn't hate the weed killer or bug spray, both of which work really well. The soil analysis was cool to see, and so far the AI chat Sunny has...

Published date
10/22/25
Was this review helpful?
3
1
Bob
Verified Reviewer
LocationMedina, Ohio
Best Lawn In The Neighborhood

Was not sure about this system but by following the Sunday directions, other some pesky clover, I have the best looking lawn in our subdivision.

Published date
10/17/25
Was this review helpful?
4
1
David
Verified Reviewer
LocationOhio
Huge improvement!

It has taken a little while, but my yard is much better after Sunday treatments.

Published date
10/17/25
Was this review helpful?
5
2
Randall
Verified Reviewer
LocationRinggold GA
I’m very pleased so far

I started Sunday treatments in August of this year and am pleased with the results. I love the ease of transactions as Sunday sends my tools as they are needed and I have a schedule that tells me when to apply. No guess work. I also love the Sunny feature and have used it a few times. It is very hel...

Published date
10/16/25
Was this review helpful?
5
2
Therese
Verified Reviewer
LocationSouthwest Ohio
Working on it

I started the Sunday program in August. My yard hadn’t been fertilized since last autumn and isn’t in the best shape. After 4 applications of fertilizer it looks better but it isn’t where we want it. I just can’t seem to get the weeds out. I like the reminders to fertilize the lawn. I’m going to giv...

Published date
10/15/25
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6
2
Michael
Verified Reviewer
LocationIdaho
Idaho comeback

My yard was in need of getting greener and weeds removal. Sunday excelled at the getting greener part! The weeding product really didn't work especially the one for "garden" which ended up burning and destroying several of my flowers in bed around garden (it was supposed to be safe for flowers and g...

Comments by Store Owner on Review by Sunday on Wed Oct 15 2025
Sunday
Hello Michael, we apologize for the inconvenience caused by the weeding product and our team would love to take a look at your Sunday account and help locate your soil test results. Please reach out to [email protected] or 415-903-6932 for further assistance.
Published date
10/14/25
Was this review helpful?
4
2
Erick
Verified Reviewer
LocationGreenville, SC
Beautiful Lawn!

Sunday profucts have made my lawn so full and green. Great products, easy to apply amd great results!

Published date
10/12/25
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2
1
Nanette
Verified Reviewer
LocationBlack Hills, SD
Beautiful backyard!

First year with Sunday Lawn. I started with them in August I believe? I am a widow who loves my backyard, 2 dogs and cat, and wanted a non- chemical lawn. This product really feeds and nourishes my lawn! I water on a schedule which is important too. I used to use Trugreen but decided to do it myself...

Published date
10/11/25
Was this review helpful?
2
1
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