How To Keep Lily Pads From Growing

You can keep lily pads from growing by targeting the root system, reducing sunlight, or using natural and chemical controls, but the best results come from a combination of methods.
 
If you’ve been trying to figure out how to keep lily pads from growing, you probably already know that simply pulling them out of the water doesn’t work for long.
 
Lily pads are tough because they’re connected to a massive underground root system, so any piece left behind can sprout a whole new plant.
 
In this post, we’ll walk you through the most effective ways to keep lily pads from growing, from simple homemade tricks to stronger pond treatments, so you can finally enjoy a clear, open water surface.
 
Let’s dig into the best ways to stop those green circles from taking over your pond.
 

Why Lily Pads Keep Growing Back and What You’re Up Against

To keep lily pads from growing, you first need to understand how they spread so aggressively in the first place.
 
Lily pads are the floating leaves of aquatic plants that root deep in the mud at the bottom of your pond.
 
Each pad is connected to a long stem that leads down to thick, fleshy rhizomes, and these rhizomes can travel horizontally for several feet under the soil.
 
They also produce seeds that sink to the bottom and stay viable for years, just waiting for the right conditions to sprout.
 
So when you pull up a pad, you’re only removing the leaf, not the root system that keeps producing new ones.
 
That’s why you need a multi-step plan if you really want to keep lily pads from growing back year after year.
 

1. Cut Off Sunlight to Starve the Plant

One of the most natural ways to keep lily pads from growing is to limit the sunlight that reaches the pond water.
 
Lily pads need full sun to photosynthesize and produce the energy required for new growth.
 
If you have a small pond, you can plant tall grasses, shrubs, or even install a pergola to cast shade over the water’s surface.
 
For larger ponds, adding floating shade balls or a dark pond dye can block the light from penetrating to the bottom.
 
When the water is dark, the rhizomes can’t store enough energy, so the plant weakens and produces fewer pads each season.
 
This method is slow but very effective when combined with other removal tactics.
 

2. Pull, Rake, and Remove Every Piece of Root

If you want to keep lily pads from growing this season, physical removal is your quickest immediate option.
 
Use a pond rake or a specialized weed cutter to drag up as many pads and stems as you can reach.
 
The trick is to also remove the rhizomes from the mud, because even a three-inch chunk can regrow.
 
You can wade into shallow water and feel around for the thick, potato-like roots, then pull them up with your hands or a garden fork.
 
Be thorough and repeat this every couple of weeks, because new rhizome pieces will always try to establish themselves.
 
While it’s labor-intensive, this method is completely chemical-free and safe for fish and wildlife.
 

3. Use a Benthic Barrier to Block Root Growth

A benthic barrier is a heavy fabric or mat that you place on the pond bottom to physically keep lily pads from growing.
 
This is one of the most reliable ways to keep lily pads from growing in a specific zone, like near your dock or swimming area.
 
You lay the barrier over the mud, weigh it down with rocks or sandbags, and the rhizomes simply can’t push through it.
 
Because the barrier blocks light and physical space, it stops both new sprouts and existing roots from reaching the surface.
 
Over time, the roots underneath die off from lack of energy, and you can remove the barrier once the lilies are gone.
 
Just make sure the fabric is permeable so it doesn’t trap harmful gases in the sediment.
 

Chemical and Natural Treatments to Stop Lily Pads Permanently

For larger ponds where hand-pulling just isn’t practical, you might need a stronger approach to keep lily pads from growing all over the water.
 
Herbicides are the fastest option, but you have to apply them correctly so you don’t harm fish, frogs, or beneficial plants.
 
Look for aquatic-approved herbicides that contain active ingredients like glyphosate or imazamox, which are specifically labeled for lily pad control.
 
Apply these when the pads are actively growing in late spring or early summer, and always follow the product instructions for water temperature and dilution.
 
The herbicide works by being absorbed through the leaves, then traveling down to the rhizomes to kill the entire plant.
 
You’ll see the pads turn brown within a couple of weeks, and then you can rake out the dead material to prevent nutrient build-up.
 

1. Try a Natural Vinegar Solution for Small Ponds

If you want to keep lily pads from growing without harsh chemicals, a strong vinegar solution can work on small infestations.
 
Mix one gallon of white vinegar with one cup of salt and a teaspoon of dish soap in a spray bottle.
 
Spray this mixture directly onto the lily pad leaves on a hot, sunny day when the plant is stressed.
 
The vinegar dries out the leaves and disrupts their ability to photosynthesize, which weakens the plant over time.
 
This won’t kill the roots as deeply as a commercial herbicide, but repeated applications will reduce pad production.
 
Be careful not to spray other aquatic plants you want to keep, since vinegar isn’t selective.
 

2. Introduce Grass Carp for Natural Grazing

One of the most hands-off ways to keep lily pads from growing is to stock your pond with grass carp.
 
These fish are herbivores that love munching on aquatic vegetation, and they’ll happily eat lily pad stems and roots.
 
You’ll need a permit in most states, so check your local regulations before adding them to your water.
 
Grass carp work best in larger ponds where they have room to roam and plenty of other plants to eat.
 
They won’t eliminate lily pads overnight, but they’ll keep the growth in check over a full season.
 
Just know that if you have other prized water plants, the carp might eat those too.
 

Prevent Future Lily Pad Growth with Routine Maintenance

Once you’ve cleared out the existing lily pads, you still need a plan to keep lily pads from growing back again next year.
 
The biggest mistake people make is stopping all maintenance after a successful cleanup, only to see the lilies return with a vengeance.
 
Make it a habit to inspect your pond every week during the growing season and remove any new pads while they’re still small.
 
You should also reduce the nutrients in the water, because lilies thrive in ponds rich in nitrogen and phosphorus.
 
Limit fertilizer runoff from your lawn, and consider adding beneficial bacteria or barley straw to break down organic muck at the bottom.
 
This keeps the water clearer and makes it harder for lily rhizomes to establish themselves in the first place.
 

1. Routinely Rake Out Dead Material

Decaying plant matter adds nutrients back into the water, which feeds new lily pad growth.
 
So after you pull or treat lily pads, remove the dead leaves and stems from the pond instead of leaving them to rot.
 
You can compost this material away from the water’s edge, so the nutrients don’t wash back in during rain.
 
The cleaner your pond bottom stays, the less fertile the soil becomes for rhizomes and seeds.
 

2. Keep the Water Moving

Lily pads prefer calm, still water, so adding a fountain, aerator, or waterfall can help keep lily pads from growing rapidly.
 
The constant water movement disturbs the sediment, making it harder for roots to anchor firmly.
 
Aeration also increases oxygen levels, which promotes bacteria that break down excess nutrients before plants can use them.
 
This alone won’t stop established lilies, but it’s a great preventative measure to pair with other methods.
 

So, How Do You Keep Lily Pads From Growing?

You can keep lily pads from growing by using a combination of physical removal, sunlight reduction, chemical treatments, and routine maintenance.
 
Start with the most aggressive removal method that fits your pond size, whether that’s hand-pulling, a benthic barrier, or an aquatic herbicide.
 
Then, follow up with preventative measures like grass carp, water movement, and nutrient control to keep lily pads from growing back.
 
No single trick works 100% by itself, but combining these strategies will give you a clear, open pond you can actually enjoy.
 
The key is staying consistent, because lily pads are persistent, and they’ll take over the moment you let your guard down.
 
Keep at it, and you’ll win the battle against these leafy invaders for good.