Weeds Gone To Seed

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Can you compost weeds? Yes, but it isn’t as simple as throwing them in your pile and hoping for the best. We'll show you how to compost weeds the right way. Weeds in your garden are not only unsightly, they also are the source for more weeds to invade. Prevent new weeds from growing with Preen Weed Preventers. – Preen How to Cut Weeds After Seed Heads Appear. Weeds reproduce rapidly when they grow seed heads, and they can become an eyesore quickly as well as rob your garden and lawn of vital nutrients. Seed heads contain mature seeds that typically are spread by wind and insects. Ideally, weeds are removed before the appearance of …

Can You Compost Weeds (Without Spreading Seeds)? Yes, Here’s How

Can you compost weeds (without spreading seeds)? Yes, here’s how. If you want to take advantage of the nitrogen-rich properties of weeds for your compost pile, it’s important to take a few steps. First, don’t add any weeds that have gone to seed—you’ll need to pull weeds while they’re still young. Second, for perennial weeds such as dandelions or yellow dock, you’ll need to take a few extra steps to ensure the roots are properly killed first (through sun-drying, bagging or solarization, or drowning).

Weeds are part and parcel with gardening. If you can’t beat them, you might as well use them to add (free) nutrients and nitrogen to your compost. While some gardeners won’t even think about composting weeds for fear of spreading seeds, you just need to take a few precautions first. So before you toss your weeds into the garbage, read up on how to safely compost them!

What’s considered a weed?

While dandelions, plantain, or purslane are considered weeds to some, others covet and harvest them for culinary or medicinal purposes.

So the definition of a weed is hard to pinpoint, but it’s essentially any plant that pops up where you don’t want it.

I have a confession to make—I kind of like weeds (well some weeds, that is). Sure they’re annoying when they pop up in your vegetable garden, or between the cracks in the sidewalk. But I’ve made peace with them.

We’ve made dandelion root coffee (or tea), and sauté the dandelion greens. Purslane is tasty all on it’s own. And there are so many practical uses for common weeds including stinging nettle, yellow dock, lambsquarters, and plantain.

If we appear to have a more laissez-faire attitude towards weeds than others, it’s because the dandelions in our yard are also a food source for our pet tortoise. Plus dandelion flowers are an important source of food for bees as well!

But we understand that for some gardeners, the sight of a weed is enough to make one’s eye twitch. Keep reading for how to turn weeds into compost.

How weeds help your compost pile

In the composting world, the ingredients you add to your compost pile can be categorized as either “green” or “brown.”

Green materials are rich in nitrogen, and are quick to break down. They provide microorganisms with the nutrients needed to reproduce and grow. Garden weeds fall under this category as do kitchen scraps, plant clippings, and lawn clippings.

Brown materials are filled with carbon. Carbon provides energy slowly to microorganisms, and carbon-rich ingredients are tougher to break down. Examples of brown matter are twigs, branches, and unbleached paper products.

The color of the object doesn’t necessarily correspond to its classification. For example, coffee grounds are brown, but fall under the green category.

A balance of approximately half green and half brown materials, plus water, oxygen, and a bit of heat are needed for composting success.

So hang on to those pulled weeds for a valuable boost of nitrogen!

Why it’s important to compost weeds properly

Weeds are prolific seeders (otherwise they wouldn’t be weeds!). As such, live weed seeds pose a problem for backyard composts.

If you introduce weeds that have gone to seed to your compost pile, this could propagate weeds once you spread the finished compost around your garden.

Or, if you accidentally add weeds with seedheads to a cold compost, these seeds may lie dormant for many years before spreading around. We’ll talk more below about how the temperature of your compost needs to be hot before adding any weeds that have gone to seed.

Tip: Seeds from weeds are not the only way that weeds can sprout in your garden. If you’re introducing animal manure, often times this contains weed seeds. Ensure any animal manure you add to your compost is fully decomposed before adding to your garden.

How to compost weeds the right way

If you want to keep weeds to a manageable level, it’s best to pull ’em out while they’re young and haven’t gone to seed. In this way, they’re generally safe to add to the compost bin as is. However, if the weeds have deep roots or rhizomes, keep reading below.

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Now would be a good time to also mention noxious weeds. It’s a good idea to read up on noxious weeds in your area and what the recommended guidelines are for disposing of them. Depending on where you live, a noxious weed could be a Canada thistle, or a Japanese Knotweed. We do not recommend adding noxious weeds to your compost as is. Please follow your local guidelines on how to best dispose of noxious weeds.

So, what do you do with weeds that have gone to seed? And what about those pesky roots?

How to compost weeds with roots

Perennial weeds such as couch grass, dandelions, and docks tend to have deep roots or rhizomes which is why they’re able to pop back in the same spots year after year.

If you throw these types of weeds with roots intact into the compost, they might get a little too cozy and make a new home. Unfortunately, a compost pile provides a favorable environment for these types of resilient weeds to take root right in your compost heap. (1)

There are a couple of ways to deal with the roots before adding to your compost.

Sun-dry method

If you have a lot of weeds with pesky roots, you can use the heat of the sun to fry and dry them.

  1. Lay your weeds onto a sheet of newspaper or cardboard. It’s best to have a single layer for quicker drying.
  2. Place in a sunny spot for several days until they are shriveled.

Now you can safely add them to your compost.

Smash method

This method is quick, easy, and oh-so-satisfying if you only have a few weeds with roots.

  1. Use a hammer or a rock to smash the roots.
  2. Smash some more.

As resilient as weeds are, I highly doubt the weeds can take root after you’ve had your way with them with a hammer or rock.

How to compost weeds with seeds

The nagging concern with composting weeds of course is what to do about weed seeds.

First of all, it’s really difficult to rid your garden or compost pile completely of weed seeds. After all, seeds can get blown in by the wind. You can mitigate this by having a covered bin.

However, here are three methods you can use to effectively kill weed seeds:

  1. Hot compost method
  2. Plastic bag or solarization method
  3. Water or drowning method

Tip: If you’re worried about possible weed seeds even after you take the following precautions, the University of Georgia Extension suggests pasteurizing your compost before adding to potting mix. Place the finished compost in your oven for 30 minutes at 160 degrees Fahrenheit (71 degrees Celsius).

Hot compost method

Some say that if you have a hot compost pile, one that reaches a temperature of 140 degrees Fahrenheit (60 degrees Celsius), this is sufficient to kill seeds. However, it’s not just enough for the compost to reach this temperature—this hot temperature must be sustained for a long period of time, up to several weeks.

During this time, the compost needs to be turned frequently to evenly distribute the heat and ensure all parts of the compost receive moisture and oxygen.

However, most backyard compost piles rarely reach this temperature. And even if your compost does, a few seeds may survive…

Plastic bag (or solarization) method

An easy, but slow way to kill weed seeds is to place all weeds in a plastic bag and seal it up.

Solarization is a method used in warm, sunny places such as California to control soilborne pests and weeds by capturing the sun’s radiant energy. While typically solarization involves placing large sheets of plastic directly over swaths of earth, we can still capture the same effect in an easier way by using a simple plastic bag.

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Depending on your local climate and how warm your plastic bag gets, this method can take anywhere from several months up to a year. So place your weeds and seeds into a bag, seal it up, and put it somewhere sunny, yet out of sight. It may help if you use a black garbage bag to attract more heat.

Once the weeds have all died, they’re safe to add to your compost.

Water or drowning method

With this method, you’ll need a large bucket with a cover, water, and a stone or brick to weigh the weeds down. You’ll be essentially making a weed slurry. This method is a bit messy and may produce a slight smell as the weeds turn slimy. This method takes up to 6 weeks to “drown” the weeds.

Simply place your weeds and seeds in a large bucket of water. Use a large stone or brick to ensure all parts of the weeds (especially the roots) are held below water. Place a cover on top.

After several weeks, all weeds should be safe to add to the compost pile. Before you dump out the slurry liquid, you can make a fertilizer by using the strained liquid and diluting with water before adding to plants.

Preventative measures are the best way to control weeds

Before your yard or garden is overrun with weeds, it’s best to be proactive with weed management:

  • Pull weeds while they’re young and before they’ve had a chance to establish an underground root system in the case of perennials.
  • Use mulch!Mulch made of natural materials such as wood chips, leaves, or straw are a great way to suppress weed growth. Plus, they add nutrients to your soil once they decompose.
  • Keep your lawn (slightly) longer. Did you know that shortly-cut grass invites in more weeds? It’s best to let your grass grow a bit longer, at least 2–3 inches (5–8 centimeters). It’s a win-win—less mowing and fewer weeds!

The takeaway: can you compost weeds?

You can compost weeds, it just takes a little extra work. First, don’t add any weeds that have gone to seed—you’ll need to pull weeds while they’re still young. Second, for perennial weeds such as dandelions or yellow dock, you’ll need to take a few extra steps first (through either sun-drying, bagging or solarization, or drowning). The nitrogen-rich properties weeds provide is worth some extra effort!

Related questions

Where should compost be in—sun or shade?

There’s a misconception that selecting a sunny location for your backyard compost will help to “heat” it up. While the sun’s rays will provide a little bit of heat, most of the heat generated comes from the microorganisms breaking down the materials. A compost placed in a sunny area may need more frequent watering as the sun will dry it out.

The United States Environmental Protection Agency (EPA) recommends selecting, “a dry, shady spot near a water source for your compost pile or bin.” A compost in the shade stays damp for longer (less watering).

Ultimately, what’s more important than the location is how you manage the compost. Keep feeding it with a good mixture of “greens” and “browns”, keep it moist, and turn it at least once a week.

Can I put moldy fruit in compost?

Generally speaking, moldy produce should be safe to put in the backyard compost. Enzymes in foods are typically what cause food to spoil and produce mold. The microorganisms in your compost will help break down the moldy food. If you have a vermicompost, you may need to use caution before introducing too much moldy foods. Some types of mold may harm the worms’ digestive systems.

Weeds Gone To Seed

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Why You Should Never Let a Weed Go to Seed

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A big reason that weeds are such effective invaders is that most of them are very prolific seeders. It’s not unusual for a single weed plant to throw off hundreds of viable seeds. If weeds are left to grow and produce new seeds, any that fall to the ground can live for years in the soil. Some can live for decades. That’s why the number one rule in winning the long-term battle against weeds is to stop them from growing at all.

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Dealing with weeds you already have

If common spring-time sprouters like chickweed, purple deadnettle, dandelions, garlic mustard, and creeping speedwell have already flowered, a steady supply of summer weeds will be attempting to flower and set seed. Some of the worst summer seeding weeds include pigweed, purslane, thistle, lamb’s quarter, black medic, spurge, bindweed, Japanese knotweed, and assorted grassy weeds.

Pulling and/or digging is the most immediate, effective control. Just be sure to get roots and all or else many weeds will simply sprout new leaves from the roots left behind.

Be persistent, and you’ll eventually win – or at least gradually reduce the outbreaks by denying weeds from reproducing via seeds. Even if you can’t pull or kill all existing weeds, at least patrol enough to cut, hoe, or weed-whack any that are forming flowers or flower stalks.

Preventing future trouble

Bare soil only invites weeds, so it is best to add plants to bare spaces and add a few inches of mulch to your landscape beds to fill the space, leaving no room left for weeds.

Granular weed preventers such as Preen can go on top of mulched, planted beds to further stop new weeds before they have a chance to sprout and grow. Two to three applications per year can give season-long protection, depending on your climate and which type of Preen you use.

Preen offers many different options for controlling weeds in your landscape.

    provides protection from new weeds for up to 6 months and is labeled for use around 600 plants in perennial flower beds; around groundcovers, trees, and shrubs; and in xeriscape settings and rock gardens. blocks new weeds from germinating in your garden for up to 3 months and is labeled for use around 200 established flowers, vegetables, trees, and shrubs. blocks weed seeds from germinating in your garden for up to 3 months, and gives your plants a boost of plant food for beautiful, radiant blooms. is a natural way to keep weeds from sprouting in your vegetable garden. Providing 4-6 weeks of weed protection, Preen Natural can be used around any plant, including established vegetables, herbs, and fruits.

Remember, every weed flower you prevent or eliminate now could translate into hundreds of fewer weeds you’ll have to deal with later.

How to Cut Weeds After Seed Heads Appear

Weeds reproduce rapidly when they grow seed heads, and they can become an eyesore quickly as well as rob your garden and lawn of vital nutrients. Seed heads contain mature seeds that typically are spread by wind and insects. Ideally, weeds are removed before the appearance of their flowers that eventually release seeds. If some of them escape removal before they produce seed heads, they can be cut down. When you remove weeds with seed heads, you eliminate one of the biggest sources of weeds on your property.

Cut off weed flowers and seed heads using pruning shears, and dispose of them immediately. Cutting the flowers and seed heads rather than removing entire weed plants is ideal if you find weeds in your vegetable garden and don’t want to disturb your crops by yanking out whole weed plants. If the weeds contain large leaves that cover your plants, clip off all the weeds’ foliage so your crops receive more sunlight.

Cut weed plants to ground level with pruning shears or a lawnmower that has a mower bag. If you use a lawnmower, empty its mower bag into the trash immediately so that you do not inadvertently spread the weed seeds the next time you use the lawnmower.

Collect all of the cut weeds and seed heads with a rake, and dispose of them. Repeat the cutting process when the weeds grow and especially before they produce seed heads again.

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