October is here, and while your yard may look calm now, don’t let it fool you. The real weed problem arrives in February and March when the weather begins to warm. That’s when seeds left behind from the summer and monsoon rains start to sprout — and if you haven’t prepared with a pre-emergent, you’ll be facing a wave of unwanted growth.
At Bug & Weed Mart, we’ve helped Arizona homeowners prevent weeds for decades. Here’s everything you need to know about how pre-emergents work, the products we recommend, and why applying now can give you six months or more of protection.
Why Worry About Weeds?
Weeds don't just ruin the look of your lawn, they can overtake it and compete with plants and trees for nutrients and water. Weeds can seem harmless at first, but once they take root, they are tough to manage and get rid of.
Here are a few ways weeds will create issues in Arizona yards and gardens if you fail to take preventative action:
- They spread fast — seasonal rains and warm soil help them germinate quickly
- They compete with your plants — weeds steal water and nutrients from your grass, flowers, and gardens
- They increase yard work and the need for ongoing maintenance — pulling weeds in the heat is frustrating and uncomfortable, along with time-consuming.
When you stop weeds before they start, you save yourself the battle altogether.
How Pre-Emergent Works
Pre-emergent herbicides act like an invisible shield in your soil, preventing weed seeds from sprouting in the first place. They are safe for your existing plants, trees and lawns. It is important to note that once the chemicals are dry, pre-emergent solutions are also safe for pets. Applying a pre-emergent every six months will help homeowners reduce or avoid hours of pulling weeds. Spraying pre-emergent regularly is a simple protection before weeds begin to grow, that provides long-lasting results.
Two Options for Easy Application
Bug & Weed Mart carries both liquid and granular pre-emergents so you can choose the method or combination that works best for you and your yard.
Liquid Pre-Emergent (Customer Favorite)
- Covers up to 5,000 square feet, enough for multiple applications
- Lasts 1.5 to 2 years for most homeowners
- Costs less than $40
- To apply, mix the solution with water in a hose-end sprayer and coat areas evenly where weeds typically grow
Granular Pre-Emergent (Pendulum)
- Apply with a hand spreader, then water into the soil
- Provides even longer-lasting results
- Ideal for homeowners who prefer spreading over spraying
Both options are simple, affordable and effective. The pre-emergent solutions are good to apply in the fall as the weather begins to cool before seeding the winter lawn.
Timing Matters
Pre-emergents don’t kill existing weeds — they stop seeds from germinating. That’s why timing is everything. Applying in October builds a barrier that will last through the holidays and into spring. Waiting until February or March means you’ve already missed your chance, and weeds have already germinated.
What if Weeds Still Pop Up?
Even with a solid pre-emergent application, a few weeds may still sneak through, especially if there were gaps in coverage or if seeds were already established before treatment. The good news is that this doesn’t mean your pre-emergent didn’t work. A small amount of breakthrough is normal and easy to manage.
If you notice weeds after applying pre-emergent:
- Spot treat problem areas with a post-emergent product
- Check for coverage gaps, especially along borders or hard-to-reach corners
- Reapply if needed, particularly in high-traffic areas or after heavy rains
And remember, you don’t have to troubleshoot alone. Swing by your nearest Bug & Weed Mart for expert guidance. Our team will help identify why weeds popped up, recommend the best follow-up products and make sure your yard stays protected for the months ahead.
Staying Ahead of Weeds
Weeds may be inevitable in Arizona, but pulling them doesn’t have to be. By using a liquid or granular pre-emergent now, you can stop them from taking root before they begin to sprout. When you take action ahead of time, you can expect to enjoy six months or more of worry-free protection.
Bug & Weed Mart makes it easy and affordable to keep weeds and pests away with professional-grade products and friendly, knowledgeable guidance. Visit one of our Valley locations today and take the first step toward a weed-free yard this spring.
FAQs
They’re at their most active, hunting and mating during warm nights.
Yes. Sensory hairs pick up subtle temperature changes and vibrations.
Often. Monsoon rains flood their hiding spots and send them into homes and yards.
A mix: seal entry points, use perimeter insecticide, and check indoors with a UV light.
Moisture, available insects, and dark, undisturbed hiding spots like firewood piles or cluttered closets