You can spray Dawn water plants mixes but it is not a good idea for your plant health. Dawn can kill some bugs on contact but the additives may burn your leaves over time. Real insecticidal soap works better without the risk of damage to your plants.
I learned this lesson the hard way on my peace lily a few years back. I mixed Dawn with water like I read online and sprayed the whole plant down for aphids. The bugs died but so did several leaves that turned brown and crispy within a week after my spray.
Using Dawn dish soap plants treatments seems smart since soap kills soft bugs fast. The dish soap breaks down the waxy coating on insects and they dry out. But that same action also strips the protective wax off your plant leaves leaving them open to damage.
Commercial dish soaps like Dawn have surfactants, degreasers, and fragrances added to cut grease on dishes. These harsh chemicals work great on pots and pans in your kitchen sink. They are way too strong for the tender tissue of most plant leaves though.
Real insecticidal soaps use potassium salts of fatty acids that kill bugs but are safe for plants. Companies test these products on many plant types before selling them to you. Dawn and other dish soaps skip this plant safety testing since they are made for dishes.
A dish soap plant spray may seem fine at first since the bugs die and leaves look okay. But the damage builds up with each use you make over the season. By the third or fourth spray, you start seeing yellow spots and burned edges on your leaves.
Some people use Dawn for plant pests for years and swear by it without any issues at all. They often have tough-leafed plants like citrus or hibiscus that handle soap better. Thin-leafed plants like ferns and palms will show damage much faster from Dawn.
In my experience, the money you save on Dawn is not worth the risk to your plants. A bottle of proper insecticidal soap costs about five to ten dollars at any garden center. This small spend protects your plants from the leaf burn that dish soap can cause.
If you must try a dish soap mix, test it on one small leaf first and wait a full day. Check for spots, wilting, or color changes before you spray the whole plant down. This test can save you from ruining a plant you care about.
Safer choices include Safer Brand soap or horticultural oils from your garden store. These kill the same pests that Dawn targets. They do not harm your plants at all when you follow the label rate directions.
Skip the Dawn and grab a proper pest spray from your local garden store instead. Your plants will stay healthy while you knock out the bugs that bother them. This small change makes a big difference in how your plants look and grow over time.
Read the full article: Scale Insects Treatment: 8 Proven Methods
