As winter approaches, outdoor plants can easily wither and die, but some plants can thrive indoors. These cold-hardy indoor plants not only increase the oxygen content indoors but also add a touch of green to our lives.

1. Cactus - A succulent plant that tolerates drought and low temperatures
Cacti are one of the most cold-hardy plants for indoors. They love plenty of sunlight and little water, only needing to be watered once a week in winter.
2. Coniferous Silver Lotus - An evergreen plant suitable for balconies
The Coniferous Silver Lotus is an evergreen plant that remains green even in the cold winter. It requires plenty of sunlight and moderate humidity, and can be placed on a balcony to enjoy the sun.

3. Geranium - A cool-temperature-loving plant
Geraniums are cold-hardy plants that love cool temperate climates and can grow healthily even in winter. They need plenty of sunlight and a moderate amount of water, and can be placed on a windowsill or in a sunny spot indoors.
4. Evergreen - A small tree suitable for indoors
Evergreens are plants that are suitable for indoor growth. They need plenty of sunlight and moderate humidity, and can be watered once a week in winter to maintain their healthy growth.
5. Maidenhair Fern - A plant suitable for humid environments
The Maidenhair Fern is a plant that loves a humid environment and requires higher humidity and less sunlight in winter. It can be grown in humid environments like bathrooms or kitchens.

6. Spider Plant - A hanging plant suitable for viewing from a height
The Spider Plant is a common hanging plant that likes a warm and humid environment. In winter, it needs less sunlight and a moderate amount of water, and can be placed high up for viewing.
7. Marigold - A plant suitable for sunny indoor places
Marigolds are plants with high sunlight requirements and are suitable for sunny indoor places. In winter, they need plenty of sunlight and a moderate amount of water, and can be watered once a week.
8. Aloe Vera - An air-purifying plant suitable for the bedroom
Aloe Vera is a classic air-purifying plant that requires less water and sunlight in winter. It can be placed in areas with poor air circulation, such as bedrooms, to help purify the air.
9. Small Parasite - A green plant suitable for indoor viewing
The Small Parasite is a green plant that can be placed indoors for viewing and likes a warm and humid environment. In winter, it needs less sunlight and a moderate amount of water, and can be watered once a week.
10. Carnation - A cold-hardy plant suitable for growing in cool environments
Carnations are cold-hardy plants suitable for growing in cool environments, liking moist soil and a moderate amount of sunlight. In winter, they need a small amount of water and plenty of sunlight to maintain growth.
11. Bamboo - A tall green plant suitable for balconies
Bamboo is a tall green plant suitable for growing on balconies. In winter, it needs plenty of sunlight and a moderate amount of water, and can be watered once a week.
12. Ivy - A plant suitable for growing indoors or in partial shade
Ivy is an evergreen plant suitable for growing indoors or in partial shade. In winter, it needs a small amount of water and appropriate sunlight to maintain growth.
13. Boston Fern - A plant suitable for growing in humid environments
The Boston Fern is a plant that loves a humid environment and requires higher humidity and less sunlight in winter. It can be grown in humid environments like bathrooms or kitchens.
14. Reed - A plant suitable for viewing in waterside environments
Reeds are plants suitable for viewing in waterside environments, liking moist soil and a moderate amount of sunlight. In winter, they need less water and plenty of sunlight to maintain growth.
15. Snake Plant - A plant suitable for sunny indoor places
The Snake Plant is a plant with high sunlight requirements and is suitable for sunny indoor places. In winter, it needs plenty of sunlight and a moderate amount of water, and can be watered once a week.
Cold-hardy indoor plants can not only increase the indoor oxygen content but also add a touch of green to our lives. Choosing cold-hardy indoor plants that are suitable for your living environment and growth conditions allows us to have beautiful green plants even in winter.