Is Milk Good for Plants? Benefits, Risks & Best Plants
Milk is good for plants only in small, diluted doses. Mixed 1:1 with water, it adds a little calcium and nitrogen to the soil, and a weaker spray on the leaves has helped control powdery mildew on squash and cucumbers. Poured straight from the carton, though, milk sours in the pot, smells, and feeds mold and gnats, so treat it as an occasional supplement, not a fertilizer.
Below, you’ll learn how watering plants with milk works, which plants like milk (tomatoes and peppers top the list), how to use it on leaves, and when to skip it. If you’re testing kitchen remedies, compare it with banana water.
Spotted white powder on the leaves? Check it with our plant disease identifier before you spray.
Benefits of Watering Plants with Milk
Watering plants with milk can add some benefits in the form of calcium and trace amounts of nitrogen hailing from the protein content in the milk. While this is something that can’t replace fresh water, you can add this to your monthly care routine in small amounts.
- Use up leftover milk: if you have leftover 2% liquid, then you can easily dilute it with equal parts of water and pour it into your flower’s soil. Do not use milk without water or sweetened milk solution as these can cause excessive rot and attract pests.
- Help plant growth: providing calcium and vitamins, the beverage can aid in defending against blossom-end rot, a common calcium-deficiency symptom that can be seen in peppers, apples, or crucifers.
- Low-dose fertilizer: The proteins get broken down into small amounts of nitrogen which is good for growing foliage. This low dose can help prevent you from over-fertilizing your plant.
Curious about which plants can benefit from milk? This handy guide highlights some favorites that thrive with this natural and unexpected fertilizer!
Is Milk Good for Plant Leaves?
Milk can be used to clean leaves as well as deter some common issues such as powdery mildew or aphids. Soil milk dilution sprays can be used on the leaves as a method of foliar feeding, which means allowing nutrients to be sprayed on and absorbed by the leaves. This can allow for more direct absorption of important macro and micronutrients for the plant. Much like fertilizing, this method is noticeably quicker to give results and can be done once monthly.
To feed using this method:
- Set up your 2:1 solution of water to milk in a spray bottle
- Mist your plant from top to bottom, on both the tops and undersides of the leaves. Take care not to soak your green friend.
- Let the spray dry for about 30 minutes.
- Wipe off your plant’s leaves using a damp, soft cloth to get any leftovers off.
Thoroughly clean your spray bottle after each use to avoid spoilage or contamination of a future foliar spray.
How to Clean Plant Leaves with Milk
Keeping your houseplant’s leaves clean is an essential part of caring for and maintaining it. Here is how to prepare a mixture to aid in cleaning plant leaves with milk.
- Prepare the mixture in a 1:1 ratio. Add to a spray bottle and shake to mix.
- Spray leaves with diluted milk and water mixture. Let this liquid sit on leaves for about 30 minutes.
- Using a soft, slightly damp cloth, wipe off your leaves gently. Support the back of the leaf with your hand, so you don’t cause damage to the leaf.
It is important to remember to wipe off your plant’s leaves of the leftover as it can leave behind a sugary residue that can cause odor and attract pests or fungi.
Is Milk Good for Trees?
It can definitely benefit trees as it benefits other types of plants like houseplants and vegetables. The addition of calcium and nitrogen can help the greenery as well as the soil’s overall health. Take care not to overdo this treatment, as too much of a good thing can cause damage to your tree, while a typical dose can help your tree and the soil’s health.
How Do You Use Milk as Fertilizer?
Another benefit of using the drink on your house inhabitants is using milk as fertilizer. Containing small amounts of nitrogen and calcium, adding it to your soil can give your plant a boost in nutrition.
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Dilute your liquid with the same amount or more in water. To sufficiently reach the roots, you will want a solution about the same in volume as you use to water your plant normally.
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Shake or mix your solution
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Add the solution to the soil and water it normally.
How to Use Milk and Molasses for Plants?
Milk and molasses for plants don’t seem like the most intuitive combination. Molasses contains nutrients such as magnesium, potassium, and calcium, which are essential for plant functions and can help improve your soil quality and even increase yield.
- A mixture of equal parts water and milk with 1-3 tablespoons of molasses per gallon of water.
- Pour this mixture into the soil, such as nightshades and other fast-growing plants. Do not use it on greenery that cannot tolerate acidity, as sugar acidifies soil and can hinder its nutrient absorptions if it cannot perform well in these soil types.
FAQ
Does milk help plants grow?
Milk doesn’t make plants grow faster than regular water and fertilizer. Diluted milk adds small amounts of calcium and nitrogen to the soil, which can support healthy growth, but plants still need regular watering and a balanced fertilizer.
Is milk good for tomato plants?
Diluted milk is mildly good for tomato plants. Mixed 1:1 with water and poured on the soil once a month, it adds a little calcium. It won’t prevent blossom-end rot on its own, though: steady, even watering is what keeps tomatoes from getting it.
Which plants like milk?
Vegetables that use a lot of calcium, like tomatoes and peppers, benefit most from diluted milk in the soil. Squash, zucchini, and cucumbers benefit from a milk spray on their leaves, which helps control powdery mildew. Succulents and cacti don’t need milk at all.
How do you water plants with milk?
To water plants with milk, mix plain skim or 2% milk with an equal amount of water and pour it on the soil, not the leaves. Do this no more than once a month. Never use sweetened, flavored, or undiluted whole milk.
Can milk get rid of powdery mildew?
Diluted milk can help control powdery mildew on squash, zucchini, and cucumbers. Mix 1 part milk with 2 parts water, spray both sides of the leaves in the morning, and repeat weekly. Wipe off any residue that stays sticky after a few hours.
Is milk good for snake plants?
No, milk isn’t good for snake plants. They prefer lean, dry soil, and milk in a pot sours, smells, and can encourage mold and root rot. Feed snake plants with a diluted houseplant fertilizer a few times during spring and summer instead.
Is spoiled milk good for plants?
Spoiled milk can be used on garden soil if you dilute it 1:1 with water and shake out any lumps. Avoid using it on indoor plants, because it smells strongly as it breaks down and can attract fruit flies and gnats.
Is almond milk good for plants?
Almond milk offers plants little benefit. It contains much less natural calcium and protein than cow’s milk. Use plain water, a regular fertilizer, or diluted rice water instead.
Can milk attract pests or cause mold?
Yes, milk can attract pests and cause mold if you use too much or don’t dilute it. The sugars and fats feed fungus gnats, fruit flies, and mold on the soil surface. Always dilute milk at least 1:1 and wipe leftover spray off the leaves.
