No, you generally should not leave pulled weeds in your garden because they can easily regrow, spread seeds, harbor pests/diseases, and steal nutrients, but you can use some weeds as mulch if they haven't gone to seed and aren't diseased. The best practice is to remove weeds with seeds, roots, or disease far from your garden, while non-seeding weeds can sometimes be left to decompose as mulch, though bagging or solarizing is safer.
In general, it is good to pile weeds, such as nutsedge, Florida betony, or Greenbriar, on top of a plastic sheet or tarp and then cover them with another tarp, leaving them to dry out in the sun for a few weeks before composting. Weeds that are not yet producing seeds are also ideal for composting.
Remember, a weed is an undesirable plant in a place we don't want it. And weeds thrive where there's an opportunity -- open gaps with little competition. Nature abhors a vaccuum. In a new garden -- whether planted or sown -- desirable and necessary plant competition may be 1-3 years away.
Garden weeds can be controlled without using chemicals, so if they are becoming a problem in part of your garden, try hand-removing, trimming or smothering them rather than resorting to weedkiller.
Make sure the weed killer has had time to work
One of the first mistakes that people make is trying to pull up the weeds before they've had time to properly absorb the weed killer. When the weeds have been sprayed, it can take a couple of days for the chemicals to be drawn down into the root of the plant.
Weeds are not made to be easy to remove, that's for sure. They are made with taproots, rhizomes, or tubers that store energy underground so they can regrow. So if you pull a weed out by hand and leave even a small root fragment behind, that weed can sprout a new plant.
October isn't too late to spray for many weeds, especially perennial and winter annuals like clover and dandelion, as they actively store energy for winter, making fall applications highly effective for root control; however, effectiveness decreases with colder soil and frost, so aim for mild, dry days when weeds are still green and growing, but stop before deep freezes.
They can compromise your cultivated plants.
Weeds compete with your garden plants for the same water, light and nutrients. Weeds have an edge because they have more aggressive root systems.
Flame weeding is a fantastic way to kill weeds permanently. It's as effective as herbicides and manual weeding and has many advantages.
If your lawn is already full of weeds, you need a post-emergent herbicide. At this point, you should also decide how much of your lawn is worth salvaging. If your lawn is truly all weeds and bare patches, you may consider a non-selective, broad spectrum herbicide to kill off everything.
Weeding is important because weeds compete with other plants for resources like water, nutrients, sunshine and space. In an organic garden, like the one at Hidden Villa, weeds have to be picked by hand because we don't use chemicals to kill them.
What to Do With Weeds After You Pull Them, According to Gardening Experts
If you're looking to get rid of them, you'll want to spray them instead of pulling them by hand. Spraying weeds requires less effort, allows you to cover a larger area, and is more effective since herbicides can quickly kill them. Meanwhile, hand-pulling weeds will require more effort and time.
For perennial weeds such as Plantain, Dandelion, Knotweed and Clover, apply a post-emergent herbicide in fall to send the killing chemicals directly to roots. This treatment will help reduce the numbers of these weeds in spring.
If you notice weeds in your lawn, the best way to deal with them is to roll up your sleeves and start pulling weeds. This budget-friendly method helps remove competition for the nutrients, sunlight, and water your grass needs to grow.
Nothing will prevent weeds from returning, but you can kill most weeds, and a thick turf prevents weeds from germinating as quickly. For years, seeds can remain dormant in your soil, waiting for their chance to grow. However, you can gain long-term control.
Here are 12 ways to kill weeds naturally in your garden.
Mulch is always number 1 for sorting out weeds. It prevents any seeds in the soil from growing and any seeds (or plant parts) that grow in the mulch itself are very easy to remove by hand. In most situations I will always hand-weed garden beds.
Use Mulching and Edging to Your Advantage
Another weed control tactic that won't harm your plants (in fact, it will help them) is mulching and edging your plant beds. Mulch can act as an effective weed suppressant by making it difficult for weeds to break through that added layer. Weeds won't have access to sunlight.
Weeds can spread rapidly if you don't pull them promptly. This can lead to them invading other parts of your garden, flower beds, or even your neighbor's yard. This rapid proliferation makes it even harder to control the weed population once it gets out of hand.
Weeds do really well in wildflower lawns, informal borders and garden margins. If you let weeds flower for pollinators and then remove seeds to prevent their spread, they can be managed fairly well. I think becoming familiar with garden weeds and embracing them as useful plants is the key to a successful garden.
Removing weeds can help maintain a tidy and visually appealing outdoor space. Competition for resources: Weeds compete with desirable plants for resources such as water, nutrients, and sunlight. When weeds are left unchecked, they can reduce the growth and productivity of crops, flowers, and other plants.
Weed Killer Application Tips:
✅ Apply herbicides in the early morning (after dew dries) or late afternoon when temperatures are cooler and winds are calm. ❌ Avoid spraying during high heat or windy conditions to prevent drift and damage.
Most experts agree that the early morning or early evening hours are ideal. During these times, temperatures are cooler, wind speeds are lower, and many pests are either just becoming active or preparing to rest—making them more vulnerable to sprays.
The best time of year to use weed killer is Spring, followed by Fall. Spring is an effective time for catching weeds in their pre-growth season, in order to prevent them from sprouting. Fall is similarly effective because, ahead of the Winter, this is when weeds are most vulnerable.