How Do Weeds Grow Without Seeds

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How do weeds grow is the oldest question for many botanists and avid garderners alike, but Green Thumb is going to get down in the dirt and answer the question for you! Weeds often seem to grow faster than desirable garden plants for the following reasons: Weed Control Facts, Winning the Battle of the Weeds Keeping your landscape plantings, flower beds, and nursery crops free of weeds is a battle, but if you approach it with a strategic plan, you

How do Weeds Grow?

Weeds live underground and that is where they keep root. Weeds will branch these long veins in the ground and take root based on their seasons. Many common ones up here such as medusaheads and cheat grass are designed to stay hidden and dormant during the winter in order to survive. The idea is that each weed in its part will always be trying to grow.

So if you cut a weed in half and leave it in the ground, it will grow. If you cut of both ends of it and leave a stalk there, it will grow into a new fuller weed.

Weeds grow and eat purely based on the soil and the sun, unfortunately, they don’t need both, they only need one. While they will always grow towards the sun, they don’t require it to survive, which is why we are able to see them in the first place.

So how do you get rid of them?

To answer this question, we have to address the fact that short of completely eviscerating the species forever, it’s impossible. You can get rid of every root in your garden or lawn and if your neighbor doesn’t keep care of theirs, it will grow into your yard.

But in short, you will need to take out every aspect of the roots and seeds in order to get rid of the weeds. This is where the term seed bank comes in. The fact is that weeds have started to realize that we don’t like them in our garden, so in order to survive they have begun leaving their sproutlings dormant all over the place. This means that there will always be the possibility of weeds anywhere.

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How Do Weeds Grow So Fast and How Quickly Can They Grow?

Weeds often seem to grow faster than desirable garden plants for the following reasons:

  • Weeds typically sprout from existing root systems or seeds present in the soil. Dormant root systems have a lot of stored energy for fast growth when spring arrives.
  • Dormant weeds present in your yard have already acclimated to the soil. Store-bought plants and seeds you sow yourself may grow more slowly as they adjust to soil conditions.
  • Some weeds have very short life cycles, sometimes lasting only 5–6 weeks. They have to grow quickly to go from a seed to a flowering plant in just a few weeks.
  • Weeds are often native plants that thrive in the local ecosystem, which helps them grow faster than desirable plants, which may be non-native.

All of these conditions give weeds a head start over the plants and grasses we cultivate. This is why it can sometimes seem like your lawn and garden is overrun by weeds overnight. Those pesky weeds can sprout quickly from existing roots and seeds, flourishing before garden plants have a chance to take hold.

Table of Contents

What Causes Weeds to Grow?

Like all plants, weeds need air, sunlight, water, and space to grow. However, many weeds are tolerant of extreme conditions.

Dormant weed seeds may also germinate earlier in the growing season than the seeds of desirable plants. As soon as temperatures rise to the minimum for plant growth, certain species of weeds sprout vigorously.

Cultivated plants and grasses may begin growing a bit later than weeds, leading to your desirable plants struggling to sprout in soil where weeds have already taken over. Those fast-sprouting weeds can block sunlight from reaching your new sprouts.

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How Do Weeds Grow Without Water?

Weed species vary from region to region and are highly adapted to local climates. Because of this, weeds thrive, even in low-water regions.

For instance, yellow star-thistle grows well in regions with long dry periods because it is specifically adapted to this climate. Meanwhile, the plants and grass you’re trying to grow may be less drought-resistant, which could stunt their growth, even when they are properly cared for.

Simply put, weeds thrive without water because they’re adapted to it. The weeds in your region are usually present because they flourish there without any human cultivation. They’re ready for whatever the elements throw at them, so don’t count on nature to kill them.

How Quickly Can Weeds Grow?

Weeds can grow 2–3 inches in 24 hours, given the right set of circumstances. 2 inches may not sound like much, but when a cluster of crabgrass sends out blades of grass in every direction, a couple inches of growth on each blade turns a minor nuisance into a major weed.

Many weeds also have notoriously short life cycles. Chickweed completes its entire life cycle in 5-6 weeks, from germination to flowering, to seeding and dying. Because weeds have brief life cycles, it’s important to remain vigilant and take measures to kill weeds early with your weed killer of choice. If you take your eyes off your garden for a few weeks, the next time you look you might see clusters of flowering chickweed among your plants.

Can Weeds Grow Overnight?

In the right conditions, with a combination of rain and warm weather, weeds can grow 1–2 inches overnight. You really can go to bed with weeds seemingly under control and wake up to a crop of weeds taking over your garden and lawn.

The good news is, warm, wet weather is also great for most lawn grasses and desirable plants. If you battle the weeds back, your other plants should be able to take advantage of this perfect weather and grow strong enough to resist future weed takeovers.

Why Do Weeds Grow Faster than Grass?

We know the following about weeds:

  • Weeds sprout earlier than some other plants and often have the benefit of established root systems.
  • Weeds are highly adapted to their local region.
  • Weeds can grow 1–3 inches in a day, given the right conditions.

These factors can account for the fact that weeds seem to be growing a lot faster than your grass. Weeds get a head start on growth, thrive in the local climate, and are capable of growing extremely quickly.

The good news is, your plants are capable of similar growth in ideal conditions (many lawn grasses can grow an inch or more in a day if given the proper set of circumstances). If you create a watering schedule that benefits your desired plants, they can compete with weeds. A healthy lawn and garden can even resist weed invasion because there are fewer places for weeds to sprout.

Why Do Weeds Growing So Fast?

Weeds grow quickly in our lawns and gardens because many species of weeds sprout from large underground roots that give them an energy boost in spring. Weeds also thrive because local weed species are adapted to their climate. Additionally, weeds have short lifespans, requiring them to progress from germination to flowering in very little time. Keep a close eye out. Weeds can grow extremely quickly, overtaking a yard or garden in a matter of days or weeks if not controlled early.

Weed Control Facts, Winning the Battle of the Weeds

Keeping your landscape plantings, flower beds, and nursery crops free of weeds is a battle, but if you approach it with a strategic plan, you will prevail. In order to develop a plan, you first must understand how weeds work, and what kind of weeds you are dealing with.

Basically weeds grow either from seed, or they reproduce from their roots. As the roots grow outward from the parent plant new plants sprout up from the lateral roots, creating more parent plants and the process continues and the weeds thrive. Weeds that tend to reproduce from the root are usually more difficult to control.

Weed controls facts? Weeds are plants, and they function just like the desirable plants in your yard. They need water, sunlight, and nutrition to survive. Of these three key survival needs, the easiest one for a gardener to eliminate is sunlight. Through proper mulching you can eliminate the sunlight.

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But first, let’s look at the steps you should go through before you mulch, then we’ll discuss the best mulching techniques to use. In order for your weed control efforts to be truly effective, you should do everything in your power to make your gardens as weed free as possible before you plant or mulch. There are a couple of ways you can go about this, either organically or with chemicals. I don’t like using chemicals, but I do use them for weed control, and I use them for pest control when necessary.

I’ll discuss organic control first. The first thing you should do is remove all unwanted vegetation from your planting area. Using a hoe, spade or other digging device, undercut the roots and remove the undesirable plants, roots and all. Then you should work the soil by rototilling or turning the soil by hand.

Once worked, let the soil sit for four days or so, and work it again. Keep doing this over and over as long as time permits. This process serves two purposes. It brings the roots that were left in the soil close to the surface so they can be dried by the sun, which will make them non viable, and it disturbs the weed seeds that have started to germinate, which makes them non viable as well. The longer you continue this process the more weeds you are eliminating from your garden.

Weed control facts? Depending on the time of the year, there are a few billion weed seeds drifting through the air at any given time, so to think that you can eventually rid a garden of weed seed is false thinking, but at least this process is effective for the remaining roots, which are the most difficult to control.

With that process complete, go ahead and plant your garden. When you’re done planting you can either mulch the bed, or keep turning the soil on a weekly basis to keep it free of weeds. Most people opt to mulch. Not only does mulch help to control the weeds, but if you select a natural mulch it also adds organic matter to the soil which makes for better gardening results down the road.

Before mulching you can spread newspaper (7-9 layers thick) over the soil and place the mulch over top of that. The newspaper will block the sunlight from reaching the surface of the soil and help to keep weed growth to a minimum. The newspaper will eventually decompose, and not permanently alter the make up of your garden.

Paper grocery bags also work well, so the next time you hear, “Paper or Plastic?”, you’ll know how to answer.

What about black plastic, or the weed barrier fabric sold at garden centers? I don’t like either and I’ll tell you why. For one, neither one of them ever go away, and the make up of your garden is forever altered until you physically remove them, which is a real pain in the butt.

Weed Control facts? Plastic is no good for the soil because soil needs to breath. Plastic blocks the transfer of water and oxygen, and eventually your soil will suffer as will your garden. It’s all right to use plastic in a vegetable garden as long as you remove it at the end of the season and give the soil a chance to breath.

Weed barrier fabrics allow the soil to breath, but what happens is that when you mulch over top of the fabric, which you should because the fabric is ugly, the mulch decomposes and becomes topsoil. Weeds love topsoil, and they will grow like crazy in it. Only problem is, they are growing on top of the fabric, and you are stuck with a ton of problems, like a weedy garden, and a major job of trying to remove the fabric that is now firmly anchored in place because the weeds have rooted through it.

Weed fabric is also porous enough that if an area becomes exposed to the sunlight, enough light will peek through and weeds below the fabric will grow, pushing their way through the fabric. I don’t like the stuff, I’ve removed miles of it from landscapes for other people because it did not work as they had expected.

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Weed control facts? Controlling weeds with chemicals is fairly easy, and very effective if done properly. I know that many people don’t approve of chemical weed controls, but millions of people use them, so I might as well tell you how to get the most effect using them.

There are two types of chemical weed controls, post-emergent, and pre-emergent. In a nutshell, a post-emergent herbicide kills weeds that are actively growing. A pre- emergent prevents weed seeds from germinating. Of the post- emergent herbicides there are both selective and non-selective herbicides. A selective herbicide is like the herbicides that are in weed and feed type lawn fertilizers. The herbicide will kill broad leaf weeds in your lawn, but it doesn’t harm the grass.

One of the most popular non-selective herbicides is Round-up®, it pretty much kills any plant it touches. Rule number one. Read the labels and follow the safety precautions. Round-up® is very effective if used properly, but first you must understand how it works. Round-up® must be sprayed on the foliage of the plant, where it is absorbed, then translocated to the root system where it then kills the plant. It takes about 72 hours for the translocation process to completely take place, so you don’t want to disturb the plant at all for at least 72 hours after it has been sprayed.

After 72 hours you can dig, chop, rototill, and pretty much do as you please because the herbicide has been translocated through out the plant. The manufacture claims that Round-up® does not have any residual effect, which means that you can safely plant in an area where Round-up® has been used. However, I would not use it in vegetable garden without researching further.

No residual effect also means that Round-up® has no effect whatsoever on weed seeds, so there is absolutely no benefit to spraying the soil. Only spray the foliage of the weeds you want to kill. Be careful of over spray drifting to your desirable plants. To prevent spray drift I adjust the nozzle of my sprayer so that the spray droplets are larger and heavier, and less likely to be carried by the wind. I also keep the pressure in the tank lower, by only pumping the tank a minimum number of strokes. Just enough to deliver the spray.

Buy a sprayer that you can use as a dedicated sprayer for Round-up® only. Never use a sprayer that you have used for herbicides for any other purpose. Once you have sprayed the weeds, waited 72 hours and then removed them, you can go ahead and plant. Mulching is recommended as described above. To keep weed seeds from germinating you can apply a pre-emergent herbicide.

Depending on the brand, some of them are applied over top of the mulch, and some are applied to the soil before the mulch is applied. A pre-emergent herbicide creates a vapor barrier at the soil level that stops weed seed germination, and can be very effective at keeping your gardens weed free. They usually only last about 3 or 4 months and need to be re-applied.

Visit a full service garden center and seek the advice of a qualified professional to select the pre-emergent herbicide that will best meet your needs. Never use a pre-emergent herbicide in your vegetable garden, and be careful around areas where you intend to sow grass seed. If you spill a little in an area where you intend to plant grass, the grass will not grow, they really do work.

That’s what I know about weed control. Read this article several times, your success depends on getting the sequence of events correct.

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