Your houseplants don’t need another pricey bottle of specialty plant spray when they already look tired, pale, or just generally unimpressed with your care routine. This simple homemade plant food mixes in minutes and gives you a quick way to feed plants with a fine mist instead of dragging out a whole fertilizer setup (because apparently the fern has scheduling demands).
Making your own costs less than using a premixed plant spray. One envelope from a 4-count box of unflavored gelatin works out to roughly $0.40 to $0.50 per batch based on current big-box pricing, which is often less than a single use from a ready-to-spray houseplant product. You also control exactly what goes in the bottle, which means no added fragrance, dyes, or extra ingredients you didn’t ask for.
You only need 2 materials for this batch: unflavored gelatin and water. The finished mixture makes about 4 cups of plant spray, so you’ll want a bowl or measuring cup for mixing and a spray bottle or other clean container for applying it.
- 🧰 Materials You'll Need
- 🔧 Tools/Equipment
- 🛠️ How to Make Plant Food III
- 🛠️ How to Use It
- 🎨 Customization Ideas
- 🛡️ Safety Information
- 📦 Storage
- 💸 Cost
- 🛍️ Need Help Finding Everything?
- ❓ Frequently Asked Questions about Plant Food III
- 📌 Love this Plant Food III? Pin it!
- 🖨️ Print-Friendly How-To: Plant Food III
Materials You’ll Need
- 1 envelope unflavored gelatin
- 1 cup hot water
- 3 cups cold water
Tools/Equipment
- Measuring cup
- Mixing bowl or large measuring container
- Spoon for stirring
- Spray bottle or other clean container
How to Make Plant Food III
- Dissolve 1 envelope unflavored gelatin in 1 cup hot water.
- Add 3 cups cold water and stir until the mixture is fully combined.
- Pour the finished plant food into a clean spray bottle or other container for easy application.
- Spray on plants.
UNH Extension notes that houseplants do best when fertilizer is used appropriately and not overapplied, so a light, even application makes more sense than drenching the plant or using this every time you reach for the watering can.
How to Use It
- Use the mixture as a spray-on plant food for houseplants or other potted plants.
- Mist lightly rather than soaking the foliage.
- Apply to healthy, actively growing plants instead of using it as a fix for severe plant problems.
- If a plant already looks stressed, pair basic feeding with better light, watering, and drainage habits. If you need more help, take a look at Sick Houseplant Treatment.
Customization Ideas
- Keep this batch small for a few plants, or divide it between more than one spray bottle if that fits your plant shelf better.
- If you like trying different homemade options, rotate this with Plant Food I, Plant Food II, or Deluxe Plant Food to find what works best for your plants and your routine.
- Pour part of the mixture into a smaller bottle if you only care for a couple of plants and don’t want a big container taking up room under the sink.
Safety Information
- Use only unflavored gelatin for this mixture.
- Let the hot gelatin mixture dissolve fully before transferring it to a spray bottle.
- Do not overapply. More plant food is not automatically better.
- If you want to be cautious with delicate or fuzzy leaves, test the spray on one small area first and watch the plant before treating everything.
- Keep the mixture out of reach of pets and children.
Storage
Store any extra mixture in a clean, covered container in the refrigerator and shake or stir before using again if it settles. Since this formula contains dissolved gelatin and no preservative, make only what you expect to use within a short time.
Cost
This batch costs about $0.40 to $0.50 to make, depending on the brand of unflavored gelatin you buy. That estimate covers the consumable material only and does not include reusable tools like the spray bottle or measuring cup.
🛍️ Need Help Finding Everything?
- Unflavored gelatin at Walmart
- Unflavored gelatin on Amazon
- Spray bottles at Walmart
- Spray bottles on Amazon
Frequently Asked Questions about Plant Food III
No. Use unflavored gelatin only. Flavored gelatin adds sugar, color, and flavoring that are not part of this plant food formula.
This batch makes about 4 cups total, since you combine 1 cup hot water with 3 cups cold water after dissolving the gelatin.
Yes. The gelatin needs the hot water to dissolve properly first. After that, you add the cold water to finish the mixture.
This version is written as a spray-on plant food, so the intended use is to spray it on plants. If you want a different homemade feeding method, it makes more sense to use one of the other plant food variations instead of changing this one on the fly.
Any clean spray bottle that produces a light mist works well. A finer spray gives you better coverage and helps avoid soaking the leaves.
Yes, but keep the same ratio. Since the original uses 1 envelope gelatin with 4 cups total liquid, it is easiest to make the full batch unless you are comfortable dividing the gelatin accurately.
Use it lightly and avoid overdoing it. Houseplants generally respond better to consistent care than to heavy-handed feeding, which is just a polite way of saying more is not better.
Yes. Store leftovers in a covered container in the refrigerator and stir or shake before using again if the mixture settles.
No. Plant food helps, but it will not fix poor light, bad drainage, chronic overwatering, or a potting mix that has given up on life.
📌 Love this Plant Food III? Pin it!
Did you try this homemade plant food? Tell us how you used it and whether you stuck with the original formula or tested one of the other versions.
🖨️ Print-Friendly How-To: Plant Food III
Plant Food III
Equipment
Materials
- 1 envelope unflavored gelatin
- 1 cup hot water
- 3 cups cold water
Instructions
- Dissolve 1 envelope unflavored gelatin in 1 cup hot water.
- Add 3 cups cold water and stir until fully combined.
- Pour the mixture into a clean spray bottle or other container.
- Spray on plants.
- Estimated cost reflects the consumable gelatin only and will vary by brand and store.
- Use unflavored gelatin only.
- Apply lightly and avoid overapplying.
- Store leftovers covered in the refrigerator and stir or shake before reuse.
