The basic neem oil plant spray recipe calls for 2 tablespoons of neem oil per gallon of water plus a teaspoon of liquid soap. This mix works well for most garden pest and fungus problems. You can make smaller batches using the same ratios.
I messed up my first batch of neem spray years ago by skipping the soap. The oil just floated on top of the water and made a greasy mess on my plants. Now I always add the soap first and know exactly how to mix neem oil for plants the right way.
The soap acts as a bridge between the oil and water. Without it, neem and water will not blend together at all. You can use regular dish soap or castile soap for this step. Just a small amount helps the neem spread out in the water and coat your plant leaves in an even layer.
Here are the exact amounts you need for your neem oil spray preparation. For a full gallon of spray, add 2 tablespoons or 30 ml of pure neem oil. Add 1 teaspoon or 5 ml of liquid soap as your mixer. Fill the rest with warm water to help the oil blend better.
My friend taught me a trick that makes mixing much easier. Start with warm water in a small cup first. Add your soap and neem oil to that cup and stir it up good. Then pour this blend into your full spray bottle of water. This way the neem spreads out right away instead of clumping.
Your neem oil garden mixture loses power fast once you mix it up. The active compounds start breaking down within 8 hours of making your spray. Never save leftover neem spray for another day. Mix only what you plan to use in one session and toss any extra.
Shake your spray bottle hard before each round of spraying. The oil and water will start to separate as it sits in the bottle. A good shake every few minutes keeps everything blended while you work through your garden. You want even coverage on every plant you treat.
Spray both the tops and bottoms of your plant leaves for best results. Bugs and fungus often hide on the undersides where you cannot see them. Get down low and spray up at the bottom of the leaves. This takes more time but catches pests that would escape a quick top spray.
The best time to spray is early morning or late evening when the sun stays low. Strong sunlight breaks down neem fast and wastes your effort. Cool temps also help the spray stick to leaves longer before it dries. Avoid spraying in the heat of the day during summer months.
Keep your neem oil bottle in a cool dark place when you are not using it. Heat and light damage the pure oil over time just like they damage the mixed spray. A cabinet in your garage or shed works great. Check the date on your bottle and replace neem oil that has sat for more than a year.
Read the full article: 10 Essential Neem Oil Uses You Should Know
