Composting Grapes

When preparing grape juice you can be left with a lot of fruit waste. This guide is about composting grapes.

Composting Grapes
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Composting Grapes


I am only a beginner and know very little about what I am doing. I have some flowers (petunias, verbena, and something else I can't identify) and a cherry tomato plant. My neighbor has a grape vine and a lot of the grapes have fallen off and gone bad. Can it help or hinder if I recycle them as compost for my garden by placing them on top of the soil?

Hardiness Zone: 10b

Thank you,
Brigitte from Israel


Hi Brigitte,

Here is some more input on your questions regarding composting grapes by adding them directly on top of your garden soil. First of all, grape's skins, pulp and seeds make wonderful compost. Several vineyards here in the U.S. compost their winery waste (or pumice), because it makes a great soil amendment by adding valuable organic nutrients to the soil as well as improving its texture. It's okay to add the grapes directly to your garden, but you'll want to turn them under so they mix in well with the soil. This should also be done at least two months prior to planting anything in your garden. This is because the fungi, bacteria and soil microbes responsible for breaking down the compost will also attack the roots of any seedlings the compost happens to come into contact with while it's breaking the waste down. You might find it more convenient just to set aside about a 3 ft. by 3 ft. area in the corner of the garden to start your pile. Here are some answers to your additional questions.

  1. Can any paper which is not glossy or coloured can be used? Can I throw in my kids old drawings? How about newspaper that was mentioned above, do I need to ascertain that there are no coloured ads? Any paper without a waxy coating can be composted. High gloss papers like those from magazines contain additional chemicals and dyes and should be avoided if possible. I wouldn't worry to much about colored newsprint ads. Most newspapers are now printed using biodegradable soy-based inks-including the colored ads. At least that's the story here in the U.S. You might want to check with your local newspaper publisher if you have concerns about it.

  2. If I pluck weeds and let them dry out, can I assume the seeds also die? How can I tell if they have seeds or not, so that I can use them? Some weeds reproduce by root rhizomes, other by runners and still others by seeds. You can never assume that the seeds (or weeds) will be made unviable by drying them out or even composting them, although a "hot" compost pile will usually reach high enough temperatures to take care of any seeds. Avoid composting any weed seeds that are obvious (I wouldn't worry about removing any grape seeds), and be prepared to pluck out a few "compost weeds" now and then.

  3. Why do you keep the compost in the fridge? I would like to start, but I would not have room for it. Some people find that it works well to keep a small bucket of kitchen waste in the refrigerator instead of running the waste out to the compost pile every evening. The refrigerator slows down the decomposition process and reduces potential odors until the container fills up and is transferred to the outdoor pile. There are also small kitchen-sized composters designed especially to fit into your refrigerator or sit on your kitchen counter. These are useful for composting small amounts of waste or making compost tea to use for houseplants.

  4. Does everything need to be crushed? I have carrot peels; do they need to be small? Do I have to crush the eggshells? Technically speaking, nothing has to be crushed or broken down before adding it to the pile, but you'll find that reducing waste to smaller- sized pieces will speed up the composting process. Carrot peels are small enough. Eggshells do not have to be crushed. Large-sized yard debris (thick sticks or branches) and plant material (e.g. sunflower stalks) can be broken down into 2-3 inch pieces or shredded for faster composting. All organic waste will break down eventually, whether you reduce its size or not.

  5. Do cooked produce (e.g. my kids leftover veggies or moldy bread or egg shells from hard boiled eggs) work too? Absolutely!

  6. How about milk products? It's generally best to avoid composting animal products (meat, fish, poultry, fat, bones, eggs, and dairy). They tend to smell and attract unwanted visitors and even disease. Also avoid vegetable oils. Do not compost plastics or synthetic fibers.

  7. Is covering it important? We don't drink filtered coffee, should I use leaves instead? It isn't always necessary to cover your compost pile, but it's helpful to prevent too much moisture from getting into the pile; it discourages animal scavengers and it traps in heat, which speeds up the composting process. Leaves, coffee and coffee grounds can all be added to your compost pile. Everything will break down eventually. A mixture containing 50-70% browns (leaves, hay and other dry matter), 30-50% greens (grass, garbage, manure) and 0-5% black (dirt or old compost) plus a little bit of moisture to make things damp (and air) is a good balance of materials for producing compost and will produce the fastest results.

  8. How long do I leave it? How do I know that it is ready? You can tell your compost is ready when it's hard to distinguish individual waste ingredients. It will probably look a lot like dirt and smell "sweet and earthy." Depending on your mix of materials and the weather, expect to see fresh compost in anywhere from 3-6 months.
CommentMoreRead More...Was this helpful?Helpful? Yes

I'm a master composter, trained by Denver Recycles. Our Community Garden here in Salida has been approached by a local who makes his own wine. Next year, he expects to generate 400 gallons of grape waste: skins, stems and seeds, and wants to compost it for our use. We're trying to prepare for the onslaught, planning to collect grass clippings and autumn leaves and many varieties of manure so that we can make a decent pile when the time comes.

How can we estimate the C:N ration of the grape waste? And what about PH? I've made many successful compost piles, but 400 gallons of grape waste is a new animal to me!

Hardiness Zone: 5b

Trish from Salida, CO

AnswerWas this helpful?Helpful? Yes

I know that this is an old post, but I just want to inform people that grapes are toxic and potentially lethal to dogs. Here is a link to some additional info>

ReplyWas this helpful?Helpful? Yes
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Home and Garden Gardening CompostingDecember 19, 2012
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