Compost is the backbone of any healthy garden, but you have two main ways to get it: make your own or buy it bagged. This guide breaks down the real differences—cost, time, nutrient content, and convenience—so you can decide what works for your garden, your schedule, and your budget. You don’t need any special equipment to follow along; just a clear idea of how much compost you need and how much effort you’re willing to put in.
What You’ll Need
- Access to a compost bin or pile (if making your own)
- Organic waste: kitchen scraps (fruit, veggie peels, coffee grounds) and yard waste (leaves, grass clippings)
- A garden fork or shovel for turning
- Water source
- For bagged: a trip to a garden center or nursery
Step-by-Step
- Assess your garden’s needs. Measure the area you want to amend. For new beds, you’ll typically add a couple of inches of compost on top and mix it in. For established plants, a topdressing of half an inch to an inch is enough. This tells you how much compost you need in cubic feet or yards.
- Decide on your timeline. Homemade compost takes anywhere from a few months to a year to fully mature, depending on how often you turn it and what you put in. Bagged compost is ready the moment you buy it. If you need compost this week, bagged is the only option.
- Compare costs. Bagged compost costs a few dollars per bag, but you can easily spend a lot if you need many bags. Homemade compost is nearly free, but you invest time and effort. If you have a large garden, making your own can save you a significant amount over time.
- Check nutrient content. Homemade compost is generally richer in beneficial microorganisms and has a more balanced nutrient profile because it’s made from a variety of materials. Bagged compost varies widely; some are just aged bark or manure, while others are fortified with added nutrients. Read the label to see what you’re getting.
- Consider weed seeds and pathogens. Properly made compost reaches high temperatures that kill weed seeds and pathogens. Bagged compost, especially if it’s from a reputable source, is usually pasteurized or sterilized, so it’s weed-free. Homemade compost that doesn’t heat up enough may contain weed seeds.
- Think about convenience and storage. Bagged compost is easy to store—just keep it dry and it lasts indefinitely. Homemade compost requires space for a bin or pile, and you need to turn it regularly. If you live in an apartment or have a tiny yard, bagged compost is far more practical.
- Test your soil (optional). If you want to be precise, do a soil test before adding compost. This tells you what your soil lacks, so you can choose a compost that addresses those deficiencies. Homemade compost is a good all-purpose amendment, but bagged compost can be tailored to specific plants (e.g., acid-loving mixes).
- Make your choice. For most home gardeners, a combination works best: start a compost pile for long-term sustainability, but keep a bag or two of quality bagged compost on hand for immediate needs or when your pile isn’t ready.
Common Mistakes
- Using unfinished compost in your garden. It can rob nitrogen from the soil and may contain pathogens. Make sure it’s dark, crumbly, and earthy-smelling before using.
- Buying bagged compost without reading the label. Some “compost” is mostly filler like bark fines, which break down slowly and can tie up nitrogen.
- Adding too much compost. A thick layer can smother roots and retain too much water. Stick to a couple of inches max.
- Ignoring the source of bagged compost. If it smells sour or looks overly wet, it may be poorly processed. Buy from a trusted brand.
Tips
- For homemade compost, aim for a mix of “green” (nitrogen-rich) and “brown” (carbon-rich) materials. A ratio of roughly two parts brown to one part green by volume works well.
- Turn your pile every week or two to speed up decomposition and prevent odors.
- Keep your compost moist but not soggy—like a wrung-out sponge.
- When buying bagged compost, look for a product that is screened and has a consistent texture. It should smell earthy, not ammonia-like.
- If you’re unsure about bagged compost quality, ask your local nursery for recommendations—they often know which brands perform best in your area.
Troubleshooting
- My homemade compost is slimy and smells bad. This means it’s too wet and lacks oxygen. Turn it, add dry browns like leaves or straw, and cover it if it’s raining.
- My compost pile isn’t heating up. It may be too dry or too small. Add water, mix in more greens, and make sure the pile is at least three feet square.
- Bagged compost has a strong ammonia smell. This indicates it’s not fully cured. Spread it out and let it air for a few days before using, or return it if it’s really bad.
- Weeds are sprouting after adding compost. If you used homemade compost that didn’t get hot enough, you may have introduced weed seeds. Pull the weeds promptly and avoid adding more unfinished compost. For bagged, this is rare, but if it happens, the product may be low quality.
Frequently Asked Questions
Is homemade compost always better than bagged?
Not always. Homemade compost is often richer in microbes and free, but bagged compost is more consistent and convenient. The best choice depends on your time, space, and needs.
Can I use bagged compost directly on my garden?
Yes, you can use bagged compost as a topdressing or mix it into the soil. It’s ready to use right out of the bag.
How long does homemade compost take to be ready?
It can take anywhere from a couple of months to a year. Hot, actively managed piles break down faster; cold, neglected piles take longer.
Is it safe to use compost from my own kitchen scraps?
Yes, as long as you avoid meat, dairy, and oily foods that attract pests. Stick to fruit and vegetable scraps, coffee grounds, and eggshells.
Can I mix homemade and bagged compost?
Absolutely. Mixing them gives you the benefits of both—microbial diversity from homemade and consistency from bagged.
How much compost should I add to my garden?
A general rule is to add a one- to two-inch layer to new beds and a half-inch to established beds each year. But always adjust based on your soil test results.