Homemade Insecticidal Soap Recipe - My Frugal Home
Jun 05, 2020· Hard water will make the soap less effective. How to Treat Plants With Insecticidal Soap. Spray on the front and backside of leaves, and in the soil around the plant. Insecticidal soap is a contact killer, so you’ll only kill the insects that you spray. Don’t apply insecticidal soap during the heat of the day. This could burn the plants.