We have an area in our pasture that is being taken over with wild mint---it was not planted there. It came by unknown means and it is increasing too fast so needs to be taken care of by some means.
Here is a couple of links for you.
https://www.gardeningknowhow.com/edible/herbs/mint/invasive-mint-how-to-kill-mint-plants.htm
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/23962/CLNO559.pdf?sequence=1
I want to know it, so to identify the plant is my problem.
Mint has square stems
The easiest way to verify if the plant is mint is the stem - mint has square stems.
There was no plant, no fertile soil in my tiny garden. I brought multi usage compost and planted different things. I have different types of mint and mint family plants. All of them have developed and are covered with white marks. I trim them from bottom, and they come out the same. I bought last week another light green one, after 3-4 days, it started having white marks on its leaves too. What can I do?
I would treat with a fungicide, such as Neem OIl.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
I want to know whether the plant is mint. And if it's not, please send me a clear photo of mint plant.
Yes, this certainly appears to be mint.
As to the variety that is difficult with close to 600 mint varieties.
https://www.gardeningknowhow.com/edible/herbs/mint/how-to-grow-mint-plants-in-your-garden.htm
Planted a new mint plant in a terracotta pot this spring. It has been on our automatic watering system all summer. It was fine initially but for some time has looked spindly, pale and has silver patches on leaves which then turn brown (patches, not whole leaves). No new shoots are appearing. No insects can be seen and problem doesn't look like rust. Help, please.
My Mints will stop growing and look spindly when they are quite root bound and are laking soil and nutrients.
I would repot the plant and trim it up. I would increase the pot size by 1 to 2 inches.
Use a good quality potting mix with a good drainage hole.
I would also treat with Neem Oil. This works as both an insecticide and fungicide and is safe for people, pets and beneficial insects.
Here are some links for you.
https://www.gardeningknowhow.com/edible/herbs/mint/how-to-grow-mint-plants-in-your-garden.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
I brought home a healthy looking mint plant a week ago. I've got it in a pit area in a semi sunny window and have been watering it occasionally. It's getting yellow spindly stems and dead leaves on bottom. Am I over or under watering it?
Yellowing leaves usually do indicate a watering issue.
You will need to check the soil, it should be moist but not overly wet.
It's best to check the soil, not water on a schedule.
Remove any dead leaves and you can prune back any leggy stems.
Make sure it is in a bright sunny location.
Here is a link with care information.
https://www.gardeningknowhow.com/ornamental/flowers/milkweed/growing-milkweed.htm
I have some fresh clipped mint - stems, 4-5 in. How to propagate?
Taking cuttings from the top growth of the Mint is preferable.
Remove the lower leaves and cut the stem just below a leaf node.
Place the stems in a glass of water and place in a light and airy location until roots have formed.
https://www.gardeningknowhow.com/edible/herbs/mint/how-to-grow-mint-plants-in-your-garden.htm