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Cardboard and egg carton kill mulches

Cardboard kill mulch

Gardening with cardboardMy favorite material for blocking sunlight and weeds at the bottom of a kill mulch is cardboard, so I was thrilled when a friend told me he was getting rid of a lot of cardboard boxes.  I've been carrying in about ten from the parking area each morning when I walk Lucy, but I used up a whole weeks' worth in about half an hour Friday.  That sent me hunting for other kill mulch bases.

Egg cartons seem to have a lot of potential in a certain niche.  If you open them out, the bottom half of one carton overlaps the top half of another carton quite well, although the Egg carton kill mulchseam between rows is less secure.  I wouldn't want to use egg cartons as a kill mulch if there were really ornery weeds underneath since the plants would certainly find that gap.

That said, I have a feeling that the cups of the egg carton might capture and hold water, helping it infiltrate the soil rather than running off.  My gut says that fungi will also like the extra air space left behind when I top the egg cartons off with mulch.  As with my bark kill mulch, I'll be waiting to see how the experimental weed blocker works as the growing season progresses.

Our chicken waterer never spills on uneven ground beneath chicken tractors.


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After the kill mulch dose its job, do you leave it in place and plant through it, or pull it off and compost?
Comment by David Sat Feb 18 15:45:18 2012

There are lots of different permutations, depending on whether you're using seed-free compost (can go on top of the cardboard) or seedy biomass (has to go under the cardboard.) And whether you're building a whole new bed or just getting lazy so you don't have to weed. I was doing the latter and don't actually plan to plant there at all since it's directly under the canopy of the tree.

In general, you leave the cardboard in place no matter what. You can cut holes in it if the cardboard covers seedy biomass and you have something to transplant there. But if you do it now, you might not even have to worry about that --- cardboard rots very quickly when in direct contact with moist ground. It should be gone within a few months.

Comment by anna Sat Feb 18 17:27:54 2012