You look at those white, wriggly insects in your potted plant. It’s grubs, but you’re not sure if they are good or bad for the plant.
Grubs are bad for potted plants because they damage plant roots. They grow into beetles that will eat plant leaves and stems, causing even more damage. You can get rid of grubs by removing them from the soil. You can also use beneficial nematodes and spores.
But why are grubs so bad, and how can you solve the problem? Let’s look at how to keep your potted plants safe from grubs.
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How do grubs harm potted plants?
Grubs damage plants by eating their roots. Damage to a plant’s root system can cause dire consequences no matter what the plant’s location. Without adequate roots, a plant will usually die of malnutrition fairly quickly.
Grubs are especially dangerous though, as plants that survive the original onslaught will then often face beetles that can cause even more damage to the plant’s leaves and stems. This one-two punch can be incredibly difficult to survive for any plant no matter how tough it is.
In a garden, this problem might take a while to become apparent, since we usually find grubs only underground and tend to take effect fairly slowly. This is the same as it is in an indoor environment, except that it’s even more important that you catch an indoor grub infestation quickly than it is to catch an outdoor one.
Not only will the plant in the pot likely be the only thing that the grubs are eating, but once the grubs grow up into beetles, they become serious pests that can cause a lot of damage to your home.
Depending on the beetle the grubs grow into, they might even cause structural damage to important parts of your home. Wood-boring beetles and powder-post beetles can both cause damage to everything from furniture to your home’s support beams.
This all makes it very important to spot a grub infestation before it becomes a more serious problem.
How to get rid of grubs from potted plants?
Your first instinct might be to use chemical insecticides to deal with the pests, but for several reasons, this will probably backfire on you.
The first reason is that insecticides can cause damage to the plants that they’re meant to protect, and the second and more important problem is that despite the name insecticides are dangerous to pretty much all animal life including people.
Fortunately, there are several non-poison-based products you can purchase and apply that should be able to help ease the grub problem.
The first biological insecticide that you’ll want to look at is helpful nematodes, certain kinds of which will eat grubs and not damage your plant at all.
Milky Spore is another biological agent which should be able to wipe out your grub population, as it is a bacterial pathogen that specifically targets beetles and grubs and is almost always deadly.
If you’re not afraid of damaging the plant, you can also simply get rid of the grubby dirt (carefully, as grubs are just as bad for lawns as they are for potted plants and gardens) and replace it with new soil that has been pasteurized. As long as you cleanse the pot, this should be a foolproof way to get rid of all the grubs in it.
How to prevent grubs in potted plants?
The best way to prevent a grub infestation in a potted plant is to be very careful about the soil that you put into the pot.
Since you have pretty much complete control over what soil you use, as long as you make sure that whatever products you use in the soil have been treated for pests it should be pretty rare for you to end up with unwanted creatures in your potted plant’s soil.
You can also treat your outdoor spaces with grub prevention products, which should provide an extra layer of defense against grubs for all of your potted plants.
How to find out about a grub infestation?
The easiest way to figure out that you have a grub infestation is to monitor your potting soil. This is easier said than done though, as unless you’re frequently digging around in your plant’s pot, you’re really unlikely to find where the grubs are living.
Fortunately, there are other signs of a grub infestation that might be a little easier to spot if you’re looking for them. You can also tell a grub infestation by its effects (namely dying plants and an increasing number of beetles in your home).
But by the time you’re experiencing these symptoms, the problem has usually progressed beyond the point where solving the problem will be simple.
If the plant is outdoors, grubs will attract an increased number of scavenging animals like raccoons or crows. These can smell grubs and will dig through most soil to get to them, which makes them a clear sign of an infestation. Unfortunately, they can cause their own additional damage to your plants, making it even more important to solve the grub problem quickly.
Unless you have a pet raccoon, however, this is unlikely to help you if your potted plant is indoors, as most potted plants are. In this case, the best way to check for grubs is to test for them.
One fairly reliable test you can do is to put a strip of cardboard over the top of half of the soil and to water only the other half.
If there are grubs in the pot, the ones in the dry part of the soil will come to the surface to find water and be convinced by the cardboard covering that they are still underground.
This test is worth reforming if you suspect you might have a grub problem for any reason.
Here are some of my favorite container gardening tools
Thank you for reading this post. I hope it helps you with your gardening needs. I’ve listed some tools below that can help you with container gardening. These are affiliate links so I’ll earn a commission if you use them.
Gardening Gloves – I find the Pine Tree Tools Bamboo Gardening Gloves really good for both men and women. It’s made from bamboo so helps absorb perspiration. They are also comfortable and fit very well.
Containers – You know picking the right container is crucial for your container gardening. I’ve written a detailed post on the best containers you can choose from. If you’re happy with a plastic container, you can check out the Bloem Saturn Planter.
Watering Can – This is a must-have tool when you’re growing plants in pots or grow bags. It helps to water the potting soil without splashing on the foliage. The Kensington Watering Can is stylish, strong, and can provide precision when watering potted plants.
Trowel – Garden Guru Trowel is my favorite because it’s durable and comfortable to use. My gardening friends really love having a trowel because they use it for digging soil, mixing fertilizer, moving seeds, leveling out the soil, mixing compost or mulch, and also dividing tubers
Bypass Pruner – I really like the Corona Bypass Pruner because it’s durable and gives a clean cut that helps plants recover faster. If you’re looking for something cheap, get the Fiskars Bypass Pruner that is really good as well.
To see an extensive list of the best container gardening tools gardeners recommend, check out this resource that I made for you.