Fertilizer Tea from Plants, Weeds, and Grass

January 29, 2019
Fertilizer Tea for the Garden
Robin Sweetser

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Using your own garden weeds and grass, you can make homemade fertilizer tea. Here’s how.

Yes, garden plants appreciate a spot of tea now and then too—just like I do—as a pick-me-up. No expensive Earl Grey or Darjeeling for them though, instead I make a free fertilizer tea from plants, weeds or grass that they appreciate even more.

Compost tea and manure tea have been mainstays of the organic garden for a long time. It is not hard to toss some compost into a bucket of water and let it steep for a few days to a few weeks, stirring daily. Cover with a piece of screening or row cover to keep mosquitoes from breeding in it. Strain off the liquid, return the solids to your compost pile, and use the liquid as a soil drench or a foliage spray, either full strength or diluted.

Garden teas made from plants are just as easy and don’t require you to pick up a load of manure or use any of your precious compost. Next time you are weeding the garden throw all the weeds into a bucket or trash can, chopping them up as you go. When it is about half full, fill it with water. Don’t use chlorinated water; rainwater is the best (also free!)


Screen the top to keep mosquitoes out. Stir daily or if using manageable sized buckets you can pour it from one bucket into another to mix things up and keep it aerated. Let it soak for 3 days to 2 weeks. Strain and use the liquid right away as a fertilizer or foliar feeding. It can be diluted or used full strength on established plants. Since plant leaves tend to absorb more nutrients faster than roots, foliar feeding is an efficient way to fertilize. Weeds are full of nutrients they have absorbed from your soil so it is only fitting to extract the water soluble ones and return them to your garden plants.

Some plants make extra nourishing fertilizer tea:

  • Stinging nettle is high in nitrogen, calcium, iron,vitamins A,B, & C, phosphorus, potassium, boron, iron, zinc, selenium, and magnesium. A natural insect repellant, when sprayed on leaves it can help plants resist insect and fungal attacks.


Be sure to wear gloves when collecting nettles.

  • Alfalfa is high in nitrogen, vitamin A, folic acid, potassium, calcium, and trace minerals. If you don’t have access to it you can use alfalfa hay, meal, or pellets. This is a “weed” whose growth I encourage in my garden, along with clover. Both are legumes and make a great soil-enhancing mulch or nitrogen-rich tea.
  • Horsetail is a deeply rooted weed that draws up minerals including potassium, silica, and iron from far below the soil.
  • Willow is rich in growth hormones, making it especially good for getting young transplants off to a good start.
  • Comfrey is rich in calcium, phosphorus, potassium, magnesium, vitamins A,B,& C, and trace minerals.


I always add a few comfrey leaves to each batch of tea.

  • Chicory is high in potassium, calcium, and vitamin A.
  • Dandelions can be put to good use making a tea that is full of vitamins A & C along with calcium and potassium.

Don’t have any of those plants? Grass works well too. Fresh grass clippings are high in nitrogen and potassium. Gather up your clippings next time you mow the lawn, fill a bucket 2/3 full of them, add water and steep 3 days, stirring daily.

Fertilizer teas are fast-acting and free. Apply them no more than every two weeks or when your plants need a boost. They are especially effective on newly transplanted ones and those in blossom or setting fruit. Brew up a batch of weeds and throw a garden tea party for your plants!

About This Blog

Get inspired by Robin Sweetser’s backyard gardening tips and tricks. Robin has been a contributor to The Old Farmer’s Almanac and the All-Seasons Garden Guide for many years. She and her partner Tom have a small greenhouse business and also sell plants, cut flowers, and vegetables at their local Farmer’s Market.

2019 Garden Guide

Reader Comments

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water is stinky

I collect yard weeds in old trash cans in which I drilled small holes in the bottom. The holes aren't big enough and get clogged so when it rains, water collects in there along with the weeds (and some dirt that was on the weed roots). After even just a few days, this mix gets RANK. It seriously smells awful. I can't figure out why this would be. But I sure am not going to pour this nastiness on my baby plants. In any event, it is on my list this weekend to drill bigger holes in the bottom of those bins!

Tea for plants


If I am growing organic vegetables, is it save to use any weeds to make tea for these vegetables. I mean most of the soil where I have these weeds is Non-organic.



Moldy tea

I tried this and got distracted from sitting it daily and it developed a white mold on top. Is it still good? Should I put it in the compost, or dispose of it and try again?

Not sure about the mold since

Not sure about the mold since I have never had mine get moldy. It is probably fine since you will be straining it out before using the liquid but I tend to err on the side of caution. Toss it in the compost and try again!

Moldy Tea

Throw it out! If the tea isn't aerated properly nasty bacteria will start growing in it and create methane. It's best to stir it a couple times a day.

garden tea and clover in the garden

I am glad you mentioned clover. I have a lot of it growing among my plants and it seems to be very beneficial to them. Thank you for your timely newsletters of gardening information. I love it!!! I can't wait to make the tea for my garden. I did not know there was such a thing.
Thank you!

weed tea

great idea didn't know we could use weeds as fertilizer!

Did this but didn't cover the

Did this but didn't cover the bucket... the bees LOVE it. We were taking turns taking drinks as I filled a jar to water a few struggling plants *that are doing much better now*. They are out there dutifully collecting the water and taking it somewhere all day!

Bees need to drink water on a

Bees need to drink water on a hot day just like us. They also ferry it back to the hive. If mosquitoes aren’t a problem or you plan to use the tea before any mosquito larvae can hatch, by all means let the bees enjoy your tea.


Can the process be sped up by boiling or steeping in hot water?

Probably but why go to all

Probably but why go to all that trouble when a cold steep works just as well?

Boiling Tea

Don't boil it! The best benefit you derive from tea is the beneficial bacteria that live in the aerated tea. That is why it needs to be stirred regularly. If you don't stir it every day other nasty things will grow in it and release methane. However, boiling the water before using it for tea might be a good idea. I use fish tank water conditioner in the water before I use it for tea or on seedlings.

making green teas for garden plant

You mention to not use chlorinated water; will letting chlorinated water sit out a day ahead of time work? Thank you so much! I didn't know I could use weeds! u

Chlorine will dissipate if

Chlorine will dissipate if left to sit for 24 hours but many towns use chloramine which does not dissipate quickly. To be on the safe side collect a bucket of rainwater next time there is a storm.

tea from plants

Wow! What a great idea. Down here in NC weeds seem to grow all year. Now maybe I won't hate them so much.

Would tea from white clover and herbs be a good addition?

This transplanted Yankee love's to read the "Old Farmer's Almanac" on a daily basis.

White clover would be an

White clover would be an awesome addition to your fertilizer tea but do some research on the herbs you plan to use to make sure they wouldn’t cause more harm than good to your growing plants.


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