1. Does Killex harm grass?
No. Killex is a selective herbicide. it targets broadleaf weeds and leaves your grass alone. Safe for Kentucky Bluegrass, Fescue, and Ryegrass.
2. When is the best time to apply Killex in Canada?
Spring is best and late April through early June when weeds are actively growing and temperatures are between 10°C and 25°C. Fall works too if weeds come back.
3. How long does Killex take to work?
Weeds start to yellow and curl within a few days. Full results take up to four weeks. Killex only works on actively growing weeds.
4. Can I apply Killex before rain?
Do not apply if rain is expected within 24 hours. Killex is rainfast in 4 hours but 24 hours dry time gives the best results. For everything you need to know about timing: How Long Does Killex Need Before Rain? →
How soon can I mow after applying?
Wait 2 days before and 2 days after applying. Mowing too soon stops the product from reaching the root.
5. Is Killex safe for kids and pets?
According to the official Killex product label, keep children and pets off the treated area until the product has fully and thoroughly dried. Drying time will vary depending on weather, temperature, humidity, and sun exposure.
⚠️ Always read the product label and Safety Data Sheet (SDS) before use.
6. Can I use Killex on a new lawn?
No. Wait until after the second or third mowing on new turf. After applying Killex wait 1 to 2 weeks before seeding.
7. How many times a year can I apply?
Once in spring covers most lawns. If weeds return wait at least 3 to 4 weeks before reapplying.
8. I have dandelions taking over my lawn. will Killex work?
Yes. Dandelions are one of the most common weeds Killex controls. For best results apply in spring when dandelions are actively growing. Read our full guide: How to Kill Dandelion Weeds in Canada →
9. I have creeping charlie — will Killex work?
Yes. Killex controls ground ivy (creeping charlie) but it can be stubborn and may need two applications. Read our guide: How to Get Rid of Creeping Charlie in Canada →
10. What is the easiest way to apply Killex concentrate?
Use the Scotts Dial N Spray hose-end sprayer. Set the dial to 6, attach to your garden hose and walk. No mixing, no measuring. Step by step guide here: How to Use Killex with the Scotts Dial N Spray →
11. Concentrate or ready-to-use. Which one should I buy?
Concentrate covers more area and costs less per application — best for larger lawns. The Killex Ready to Spray 1L comes pre-mixed — no measuring, just spray. Best for small patches or spot treatment.
