I have 3 big citronella plants in pots. I live in Ohio, can I plant them in the ground and cover them with plastic for the winter?
I am afraid that you will have to keep it as a house plant during the winter months. It is hardy from zones 9-11.
Here is an article for more information:https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
Lowest temp can it handle
You can move the potted citronella outside to a spot that receives full sun during the warmer spring to fall months once nighttime temperatures are regularly above 32 degrees Fahrenheit. Then you can choose to bring the plant indoors to a sunny spot for the winter only.
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How to keep citronella plant over the winter
These are quite easy to care for indoors. They will require 6 hours of bright light, at least, per day. Here is an article that will give you more information: https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
I have three mosquito plants (citronella) and I am worried that the winter will kill them. Should I keep them in the house all winter or can they be left outside on the patio as long as it is not freezing out?
These are pretty sensitive to the cold. You can grow them as indoor plants relatively easily. Here is an article that will help: https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
At what temp is this plant safe outdoors?
These plants will start to die in the lower 60's. You will have to bring them in when temperatures approach this. Here is an article that will give you more information: https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
The mother plant I've had for several years has started to wilt. I can't see any bugs. What can be causing it and can I save it?
That soil appears to be over-wet, which can cause this. This is usually the most likely culprit. Make sure to let the soil dry slightly between waterings, and do not let it sit in water.
It might be wise to try and root another cutting just in case the plant becomes un-salvageable. Make sure when you are trying to root these that the soil has only a very small nutrient content, as heavy nutrients will actually prevent rooting. After they have rooted you can apply a more rich soil, or feed.
Alternatively, Temperatures in the low 60's can cause this. These are not at all cold hardy.
This article will guide you on the care of these plants: https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm
Although the mother plant has been healthy for a couple of years, all of a sudden it started to droop. There seem no evidence of bugs. What could be causing this? The roots look good.
That soil appears to be over-wet, which can cause this. This is usually the most likely culprit. Make sure to let the soil dry slightly between waterings, and do not let it sit in water.
It might be wise to try and root another cutting just in case the plant becomes un-salvageable. Make sure when you are trying to root these that the soil has only a very small nutrient content, as heavy nutrients will actually prevent rooting. After they have rooted you can apply a more rich soil, or feed.
Alternatively, Temperatures in the low 60's can cause this. These are not at all cold hardy.
This article will guide you on the care of these plants: https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm