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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Sunday granular fertilizer products on lawn

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

Read article

Customer reviews

Based on 10601 reviews!
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Isabel
Verified Reviewer
LocationMaple Grove, MN
Love my yard

With Sunday's help and products, the grass in my yard and along the driveway is thriving this year. It has never been so nice, green and healthy!

Published date
10/03/25
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Ray
Verified Reviewer
LocationWinter Garden Florida 34787
St augustine sod

Put lime down as suggested waiting to see redults

Published date
10/03/25
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Dr R.
Verified Reviewer
LocationGeorgetown, Texas
Great products matched by great

Great products matched by great customer service including responses to e-mail questions. Lawn is still greening up despite local excessive temperatures and dry conditions.

Published date
10/02/25
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Carrie
Verified Reviewer
LocationFort Collins Colorado
Our yard now looks amazing!

Our yard now looks amazing! The reminders of when to apply the products are so helpful. We plan to use this every year going forward. . application is so easy!

Published date
10/02/25
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Kathleen
Verified Reviewer
LocationFlorida
Not perfect but better than what I had

I was paying a lot of money for professional fertilization services that nearly killed my lawn. I’m trying to do it in my own and while it’s not the best on the block, it’s way better than it was.

Published date
10/02/25
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Rhonda
Verified Reviewer
LocationWyoming
Very Happy!

First summer using this program and I am so happy with the results! My yard is lush and very green! We are coming to the beginning of winter and I truly feel my yard is in great shape for the long cold winter! I am already looking forward to spring!

Published date
10/02/25
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Thierry
Verified Reviewer
LocationArlington, VA
Makes things easy!

I have been following Sunday’s approach, they make it very easy to care for your lawn without having to do all the research. It’s now looking much better. I would definitely recommend them.

Published date
10/01/25
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Shel
Verified Reviewer
LocationPlymouth Meeting Pa
It's green

Started this season and my lawn looks lush and green

Comments by Store Owner on Review by Sunday on Wed Oct 01 2025
Sunday
Hi Shel! We're so glad to hear that your lawn looks lush and green this season. We can't wait to see how it continues to thrive in the future. Thank you for choosing us!
Published date
09/30/25
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Shane
Verified Reviewer
LocationIndianapolis, IN
So far so good

It's early in the process, but I do see that my lawn is much greener than the neighbors, and there are less weeds. The pet spot repair has been great!

Comments by Store Owner on Review by Sunday on Wed Oct 01 2025
Sunday
Hi Shane! We're delighted to hear that your lawn is looking greener and healthier already. We can't wait to see how it continues to improve with our pet spot repair product. Thank you for sharing your positive experience!
Published date
09/29/25
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Daron
Verified Reviewer
LocationBend, OR
Great service

I have struggled with growing a lush green lawn for ever. I started the tailor made program with Sunday and it’s been amazing. I was sitting out in front of my house yesterday and a man walking his dog said you have the best lawn in the neighborhood. Highly recommended product.

Published date
09/29/25
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