Return to the Soil Forum | Post a Follow-Up

 o
cooking oil in compost?

Posted by jz500 5 NW PA (My Page) on
Thu, Apr 26, 07 at 17:13

I have about 2 quarts of left over cooking oil, (Crisco vegetable oil) can I put that in my compost pile? I have a pile that is finished and a pile that is new, I am thinking of putting it in the new pile. Thoughts?


Follow-Up Postings:

 o
RE: cooking oil in compost?

How large is the new pile? If the new pile is large and the cooking oil would make up a small percentage of the pile, it should be ok. Make sure to mix it throughout the pile and not have it all concentrated in one spot.


 o
RE: cooking oil in compost?

Cooking oils are fats and fats give the bacteria that digest the material in compost indigestion. It is not a good idea to add large, and this is, amounts of fats to your compost.


 o
RE: cooking oil in compost?

  • Posted by jz500 5 NW PA (My Page) on
    Thu, Apr 26, 07 at 20:47

Hmmm, well my pile is about 3x3 wide and about 2 feet high. Maybe I could include some rolaids?


 o
RE: cooking oil in compost?

I would add it, but maybe add it a little at a time so you don't overwhelm the pile.


 o
RE: cooking oil in compost?

Cornell University, the Rodale Institute, the Master Composter, and many other sources of good, solid composting information do not recommend adding fats to compost.


 o
RE: cooking oil in compost?

I have BIG compost piles - thanks to the ice storm and local tree timmers one is approx. 20'x15'x5' and gets turned with the tractor ;) and like kimmsr I avoid adding fats/oils. But that is because I hope to use it all up in my lifetime.

In any quantity, they can shut a pile down completely. But in your small pile, if composting time is no object and you have a steady source of other really good additives for your children and grandchildren to add go for it. ;)

Seriously, instead use it to kill weeds in the gravel drive or in the cracks on the cement patio. Leave it out of the compost pile.


 o
RE: cooking oil in compost?

A couple cups would be fine. 2 quarts is a lot to add to that pile- and I'm the guy that always says "go ahead- throw it in!".


 o
RE: cooking oil in compost?

I fail to see why adding fats would kill the pile...
Of course I drive a diesel car so I'd probably strain it good and run it...
Seriously though it came from vegetables, it'll compost. I probably wouldn't dump it all in at once but maybe a cup a week, it'll be gone in no time.

Ever accidentally spill motor oil? It takes a while but the ground recovers...


 o
RE: cooking oil in compost?

It won't kill the pile- it makes it smell and will slow it down a great deal. It coats everything, smothering some of the microbes, and creating a small anaerobic region as well (oxygen doesn't dissolve well in oil). Yes, it is in vegetables, but in a very dilute form. There' gold in seawater as well...

Well, that's my guess. Anyway- whether I'm right or wrong on why it happens- I've seen that it does happen.


 o
RE: cooking oil in compost?

  • Posted by jz500 5 NW PA (My Page) on
    Fri, Apr 27, 07 at 16:59

I do like the idea of using it to kill weeds!

I really want to keep from having to take the oil to the landfill and would love to make use of it here.

I appreciate all the input and understand why some would or would not add it to a pile.

As for killing weeds, do you just pour a little on to smother the weed? I have a short gravel trail leading to the woods that I constantly weed. Will the vegee oil attract racoons? I have already had one destructive visit after having left cat food on my deck!!

I see coon skin hats for sale in my future!


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Soil Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here