Believe it or not, leftover beer makes a handy spot-fertilizer for your yard, and it’s purely organic, since it’s the yeast in the beer that does the job. This works best for homebrewed beer, since you end up with a thin layer of yeast on the bottom of each bottle, but it can work with commercial beers too. The idea is that the acid in beer will kill any pests, and the sugar and yeast will add beneficial soil microbes, assisting growth.
Beer as a Lawn Spot Fertilizer
Just collect any dregs in a plastic gallon jug; a milk jug works fine. Once you have enough, you can transfer some to a sprayer bottle and spray the solution on places in your yard that have turned brown or aren’t growing well. The beer fertilizer will help the affected grass grow back in more fully.
Using Beer in the Garden: Composting Beer and Slug Traps
You could use it in your garden too, but it might not be as effective or beneficial as other liquid fertilizers. A better choice is to compost dregs, beer and wine making leftover supplies, beer and wine for nitrogen materials. And, then use the compost.
The most effective use of beer in your garden is in slug traps. Simply bury a container, like a cottage cheese container or pie pan level with the soil, and fill with beer. Slugs love beer and the fermenting yeast. The trap lures and “keeps” them, deterring them from your plants. The traps need to be checked frequently, possibly daily.
Want to learn more about using beer around the garden?
Check out these helpful resources from Extension centers on composting beer and slug control:
Backyard Composting of Yard, Garden, and Food Discards from NC Cooperative Extension
Garden Tips: Insects, Pests and Diseases- Slugs and Hostas from Purdue Cooperative Extension Service