Category Archives: Killer Education

Killer Education – Will Lysol Kill My Plant?

Lysol is one of the most, if not the most popular disinfectant sprays and can be found in almost every other house in the US. Maybe that’s why after reviewing my notes I noticed that “Lysol” in customer’s questions quite frequently. Usually the question goes a little like this: “Can I spray my plant with Lysol to get rid of ________, or will that kill my plant?”

Usually my answer was a quick “no, it won’t kill your plant but it won’t look pretty” because after years of pesticide use I’ve learned that almost anything that comes in an aerosol can has the potential to burn plants with flowers, usually the most desirable part of the plant being the most susceptible to damage.

About a month ago, while on my way to clean the bathroom at work I noticed that a bottle of non aerosol Lysol had appeared in the supply closet. This made me wonder if I was wrong about Lysol and excited to try a very informal experiment.



First, I randomly selected a plant from a list of plants at the greenhouse that needed a curative spray of some sort. The unfortunate winner of this lottery was a dahlia with powdery mildew.

I then sprayed the plant with Lysol to drip. That means I applied Lysol just until the spray began to bead on the leaf and started to drip off in order to ensure complete leaf coverage. This is a common method for applying fungicides that would normally take care of powdery Mildew.


I waited for a bit and this is what I saw:


 It was even within the first hour that it showed signs of tissue damage around the outsides of the leaves and the once beautiful blossom started to wilt and showing some very noticeable spotting. I knew this wasn’t going to be good.

Here is a picture of the Dahlia after a week:


By then most of the plant was crisp and anything living was looking rather weak. I was right – Not good. On the bright side, I’m sure the powdery mildew didn’t make it through this either.


Even the non-aerosol version of Lysol will probably do horrible damage to your plants. Technically the spray didn’t kill the dahlia but it had no realistic chance of being revived to a healthful vigor by the end of the growing season so I had to put it out of its misery.

This still leaves a few questions because dahlias might be particularly sensitive to the ingredients but considering the speed at which the negative effects of the spray set in and the severity of the damage I’m erring on the side of most plants being susceptible of burns. For now I’m going to recommend staying away from using Lysol on plants.


Killer Education – White Powder on Begonia Leaves

Begonias are excellent plants for indoors and out with their vibrantly colored rose-like flowers or vivid, iridescent leaves they easily brighten up the darkest of shady areas. They normally grow fine with minimal water requirements and little other care but once and a while you’ll notice that your colorful friends have a white powder on their leaves and they begin to look stunted. This is powdery mildew, a fungal disease that begonias are notorious for getting during periods of warm days, cool nights and dry soil.

Powdery Mildew on Rieger Begonia

Powdery Mildew on Rieger Begonia

What you can do…

If your begonia is indoors you should bring it outside and cut off infected leaves. In order to prevent the disease from spreading to uninfected leave, spray the remainder of the plant with “No Powdery Mildew” fungicide.

After your plant has had some time to air out, move your plant to a new home where it will get more sunlight. Make sure to keep the soil moist as this will inhibit reinfection.


Killer Education – Little Flies In My House Plant

Everything is just fine – You’ve been diligently watering your plants, they look healthy, lush, and beautiful but you notice a yellow leaf near the bottom of your peace lily. As you reach in to cut off the yellow leaf a cloud of small gnat-like bugs swarm around your arm. Ack! What are these horrible little bugs? Are they killing my plant? What are they doing here? What you are seeing is most likely to be one of the most common house plant pests: fungus gnats.

What are they?

Fungus Gnat*

Fungus gnats are tiny flies that buzz around the soil surface and lower leaves of your plants.

What do they do?

Fungus Gnat Larvae*

Fungus Gnat Larvae*

Not much other than fly around and mate but the grub-like larvae of this insect squirm around in the soil eating roots and other assorted things living in the soil environment.

Where did they come from?

If it’s new it could have been living in the soil when you purchased the plant. Many times the sprays used on plants in greenhouses only kill the adults because the larvae go untouched below the surface of the soil.

How can I get rid of them?

You can get rid of these little flies by doing four things.

1) Put out sticky traps like Gnat Stix to catch the adults.

2) Remove the top ½ inch of soil. This is where most of the larvae live.

3) Keep the surface of the soil dry for a few weeks. It helps to “water from the bottom” which can be done by placing the plant in 2” plastic drip tray, only pouring water into this tray and allowing the plant to soak up the water from the bottom.

4) Apply Bonide systemic insect control to the soil surface as directed.

* Photos from the UofF. To learn more about fungus gnats go to the University of Florida Fungus Gnat page.

Killer Education – How to Revive a Dried Plant

Have you ever had that “Oh, yeah. I have plants.” feeling? This usually happens when you come back from a vacation and your poor plant is clinging on to its last few leaves and screaming for water.

Many people give up on their plants and throw it into the dumpster but there are times when a plant can be revived and still lead a long healthy life. Here is a dried Croton: Let’s see what we can do to help him out.
1 – Remove dead material. Remember not to pull the leaves off if they don’t fall freely from the plant when you touch it. There is a good chance you will end up tearing the plant so clip, don’t pull.


2- Once you have the plant clean it’s time to fill up the sink with lukewarm water.


There. About that much: 2-3“


3- Place your plant in the water and pour more water over the top to ensure a thorough and even watering. Allow to soak for 30 min.


4- Drain the water from the sink and allow excess water to run out of the bottom of the pot. When you are certain there won’t be any more water seeping from the bottom you can move your plant to a place with indirect bright light and wait…


5 – Remember that your plant won’t immediately recover from drying out. Fertilize your plant lightly after the leaves appear and keep the soil moist (but not wet). This process works for most plants but I’ve had the most success reviving plants with a hard stem. If your plant has all of its leaves coming from the base it might not bounce back as quickly but it’s definitely worth a shot.
Good luck with yours!

Killer Education – How to Save a Over Watered Plant

Photo from UW-Extension Cooperative Extension

Photo from UW-Extension Cooperative Extension

Have you ever had one of those plants that wilts no matter how many time you water it? Is the soil always wet but the plant never perks up? Chances are your plant wasn’t as thirsty as you thought.

Everyone knows plants get water from the soil by using their roots but when the soil stays wet for too long the roots die off and when the roots die off the plant can’t take up water and if the plant can’t take up water IT WILTS!

So, you’re plant doesn’t have any roots. Now what?

First, place it in a shady spot and stop watering it. Then allow it to dry out so that the top inch of soil is bone dry. When you do water, make sure to water until it flows out the bottom and wait for it to dry before watering it again. This will refresh the soil with oxygen and clean water to help new roots grow.