How to Use Worm Tea

by on August 17, 2012


We have had a few questions recently about the proper use of worm tea (the tea made from worm castings or worm poop) in the garden, so we wanted to give some pointers to clear up a few misconceptions. The most important thing to remember about using worm tea in the urban garden is that the longer you wait before using it, the less effective it will be. The beneficial microbes contained in the worm tea begin dying off quickly, so you don’t want to put of its use for too long. Here are a few other tips on using worm tea in the garden:

  • For the garden, use worm tea full strength no more than once per week.
  • For houseplants, use worm tea full strength once per month during the normal watering schedule.
  • For the lawn, use worm tea 50/50 strength diluted in water and distributed in a sprayer.
  • As a foliar spray, use full strength or diluted according to preference. Apply late in the evening.
  • Don’t overdo it. Worm tea is full of good stuff. Beneficial stuff. But too much of a good thing can be harmful to your plants and even kill them in some cases. I recommend using worm tea in the garden no more often than once per week.

Regardless of how you choose to use your worm tea, your plants will thank you. Most plants show visible signs of improved health and growth within just one or two applications and your garden will probably be no exception to that.

Do you have any experience with worm tea in the garden?

{ 7 comments… read them below or add one }

Shaun March 15, 2013 at 12:40 PM

I would suggest an additional article about the benefits of AACT. Actively Aerated Compost/Worm Tea. I use it on my vegetable garden, and have for years. AACT made with just earthworm castings can be used on vegetables everyday of the week, in my experience, as a root drench and foliar spray.


Carol March 15, 2013 at 12:45 PM
Karen April 24, 2013 at 10:31 AM

oh dear…I bought 3 quarts of worm tea last Thanksgiving and kept it to use in my garden now.
Is it not good anymore?
if it smells is it not good anymore?
can I still use this or/and dilute it?

I hope it is still usable


Carol April 24, 2013 at 11:22 AM

If it doesn’t smell good, it’s probably not good anymore. Worm tea should be “fresh”


harold miller September 19, 2013 at 6:33 PM

I have planted (2) new trees and shrubs and I need to know how much worm tea I can use and if I can spray the leaves on the tree and shrubs thank you.


Carol September 19, 2013 at 7:28 PM

You can’t really overdo the worm tea in one application. I would do it once every few weeks – add to soil and onto the leaves. Good luck!


Rachel December 6, 2013 at 4:49 PM

How many litres of diluted worm wee do I need to use per vegie plant per week? I use a 1/10 solution. Thanks 🙂


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