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There they can be covered with a little brushwood also for protection against too much humidity covered the frost well. Cacti belong to the group of succulents - the water-storing plants. Thus, they would freeze out there at some point, because the water in you just freezes. But it does not, because at the beginning of winter they begin to reduce the water content themselves. Many a plant lover will be surprised if his cactus has suddenly shrunk by up to half, feels soft and labbre and feels lying, They then often show spots and instead of healthy green, they are more gray-green or even brownish red. But this is necessary for survival, even if one is in doubt, whether they can enjoy a next year again.
Care in winter
However, most cactus varieties are still not hardy and if they were allowed to spend the summer in the open air, it means finding a suitable place for the winter. However, this is not particularly difficult, because here too it can be seen that the small and large spiny ones are relatively undemanding mates.The smaller plants are best kept on the windowsill, where they can keep their hibernation protected from frost. But be careful with too much sun. They should not heat up too much. Cacti generally do not like high humidities (so they are not in good hands in the bathroom), even in winter. At temperatures between 4-12° C they are fine and they can prepare in peace for the next flowering. But even the larger cacti like it as bright as possible at o.g. Temperature. If one can not offer them such a place but only a very dark corner, the temperature must necessarily be lower in relation to it. Here would also be an artificial lighting using white fluorescent lamps (not normal bulbs or halogen spotlights); about 12 hours a day makes sense.
Allow for habituation after the winter
For wintering is therefore any frost-proof under no circumstances heated room with windows and / or fluorescent lampssuitable. But beware: After hibernation your spiky friends should be shady by, for example, not too transparent curtains only slowly over 14 days to get used to the sun, as many especially naked Varieties quickly get sunburned. Densely pollinated species as well as the blue or white frosted do not have these problems. Cacti in hibernation that do not grow do not need to be watered at all. They are best left alone. At the end of September / beginning of October one pours one last time, then again in February. If a cactus continues to grow in winter quarters (some varieties do not keep up with the usual hibernation), small amounts of water should be added every four weeks. This can be done by normal pouring (a little!) Or even better by spraying the plant. Generally, cacti are sensitive to lime and should only be poured with rainwater or decalcified water. Fertilization is from autumn as with most other plants and not at all.
Many common types of cacti survive even a non-optimal treatment with difficulty, but without major problems. But even if they survive, they can only produce a great flowerage with optimal care. You need the summer / winter change with change in temperature and lighting conditions in order to be able to form these flowers.